diff --git a/docs/4-language-usage/1-general/g-1010.md b/docs/4-language-usage/1-general/g-1010.md
index 72f5f175..8a5b65b8 100644
--- a/docs/4-language-usage/1-general/g-1010.md
+++ b/docs/4-language-usage/1-general/g-1010.md
@@ -9,7 +9,7 @@ It's a good alternative for comments to indicate the start and end of a named pr
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2 4 6 8"
 begin
    begin
       null;
@@ -24,7 +24,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2 5 7 10"
 begin
    <<prepare_data>>
    begin
diff --git a/docs/4-language-usage/1-general/g-1020.md b/docs/4-language-usage/1-general/g-1020.md
index 9304972a..95892c12 100644
--- a/docs/4-language-usage/1-general/g-1020.md
+++ b/docs/4-language-usage/1-general/g-1020.md
@@ -12,7 +12,7 @@ Use a label directly in front of loops and nested anonymous blocks:
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="10 15 22 27 33"
 declare
    i            integer;
    co_min_value constant integer := 1;
@@ -52,7 +52,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="10 15 22 27 33"
 declare
    i            integer;
    co_min_value constant integer := 1;
diff --git a/docs/4-language-usage/1-general/g-1030.md b/docs/4-language-usage/1-general/g-1030.md
index 8bba6a17..e4c563e3 100644
--- a/docs/4-language-usage/1-general/g-1030.md
+++ b/docs/4-language-usage/1-general/g-1030.md
@@ -9,7 +9,7 @@ Unused variables decrease the maintainability and readability of your code.
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="4 6"
 create or replace package body my_package is
    procedure my_proc is
       l_last_name      employees.last_name%type;
@@ -33,7 +33,7 @@ end my_package;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="5 12"
 create or replace package body my_package is
    procedure my_proc is
       l_last_name      employees.last_name%type;
diff --git a/docs/4-language-usage/1-general/g-1040.md b/docs/4-language-usage/1-general/g-1040.md
index 440ccad0..0193d2b9 100644
--- a/docs/4-language-usage/1-general/g-1040.md
+++ b/docs/4-language-usage/1-general/g-1040.md
@@ -9,7 +9,7 @@ Any part of your code, which is no longer used or cannot be reached, should be e
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="4 12 19 31 38"
 declare
    co_dept_purchasing constant departments.department_id%type := 30;
 begin
diff --git a/docs/4-language-usage/1-general/g-1050.md b/docs/4-language-usage/1-general/g-1050.md
index 2fd41611..26e0c3f8 100644
--- a/docs/4-language-usage/1-general/g-1050.md
+++ b/docs/4-language-usage/1-general/g-1050.md
@@ -13,7 +13,7 @@ To avoid an extreme plethora of constants or false positives, a literal should n
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2-4"
 begin
    some_api.setup(in_department_id => 10);
    some_api.process(in_department_id => 10);
@@ -24,7 +24,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="7-9"
 create or replace package constants_up is
    co_dept_admin constant departments.department_id%type := 10;
 end constants_up;
diff --git a/docs/4-language-usage/1-general/g-1060.md b/docs/4-language-usage/1-general/g-1060.md
index 388f8d8a..3cf82d1d 100644
--- a/docs/4-language-usage/1-general/g-1060.md
+++ b/docs/4-language-usage/1-general/g-1060.md
@@ -11,7 +11,7 @@ Instead of using `rowid` for later reference to the original row one should use
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="6 11"
 begin
    insert into employees_log (
       employee_id
diff --git a/docs/4-language-usage/1-general/g-1070.md b/docs/4-language-usage/1-general/g-1070.md
index 871b075e..0b3bc5b9 100644
--- a/docs/4-language-usage/1-general/g-1070.md
+++ b/docs/4-language-usage/1-general/g-1070.md
@@ -9,7 +9,7 @@ Having an end-of-comment within a block comment will end that block-comment. Thi
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2 4"
 begin
    /* comment one -- nested comment two */
    null;
@@ -21,7 +21,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2 4"
 begin
    /* comment one, comment two */
    null;
diff --git a/docs/4-language-usage/1-general/g-1080.md b/docs/4-language-usage/1-general/g-1080.md
index ed223b32..97ed2c30 100644
--- a/docs/4-language-usage/1-general/g-1080.md
+++ b/docs/4-language-usage/1-general/g-1080.md
@@ -11,7 +11,7 @@ This rule ignores operators `+`, `*` and `||`, and expressions: `1=1`, `1<>1`, `
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="9 10"
 declare
    co_max_salary constant emp.salary%type := 3000;
 begin
@@ -29,7 +29,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql  hl_lines="9"
 declare
    co_max_salary constant emp.salary%type := 3000;
 begin
diff --git a/docs/4-language-usage/2-variables-and-types/1-general/g-2110.md b/docs/4-language-usage/2-variables-and-types/1-general/g-2110.md
index 3eba8581..467c73ad 100644
--- a/docs/4-language-usage/2-variables-and-types/1-general/g-2110.md
+++ b/docs/4-language-usage/2-variables-and-types/1-general/g-2110.md
@@ -9,7 +9,7 @@ Changing the size of the database column last_name in the employees table from `
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="3"
 create or replace package body my_package is
    procedure my_proc is
       l_last_name  varchar2(20 char);
@@ -31,7 +31,7 @@ end my_package;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="3"
 create or replace package body my_package is
    procedure my_proc is
       l_last_name  employees.last_name%type;
diff --git a/docs/4-language-usage/2-variables-and-types/1-general/g-2120.md b/docs/4-language-usage/2-variables-and-types/1-general/g-2120.md
index 14e09b0e..219b756a 100644
--- a/docs/4-language-usage/2-variables-and-types/1-general/g-2120.md
+++ b/docs/4-language-usage/2-variables-and-types/1-general/g-2120.md
@@ -11,7 +11,7 @@ A single location could be either a type specification package or the database (
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="3"
 create or replace package body my_package is
    procedure my_proc is
       subtype big_string_type is varchar2(1000 char);
@@ -26,7 +26,7 @@ end my_package;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="8"
 create or replace package types_up is
    subtype big_string_type is varchar2(1000 char);
 end types_up;
diff --git a/docs/4-language-usage/2-variables-and-types/1-general/g-2130.md b/docs/4-language-usage/2-variables-and-types/1-general/g-2130.md
index 8643c1b3..6fbaf59f 100644
--- a/docs/4-language-usage/2-variables-and-types/1-general/g-2130.md
+++ b/docs/4-language-usage/2-variables-and-types/1-general/g-2130.md
@@ -20,7 +20,7 @@ Type               | Usage
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="3"
 create or replace package body my_package is
    procedure my_proc is
       l_note varchar2(1000 char);
@@ -34,7 +34,7 @@ end my_package;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="8"
 create or replace package types_up is
    subtype big_string_type is varchar2(1000 char);
 end types_up;
diff --git a/docs/4-language-usage/2-variables-and-types/1-general/g-2135.md b/docs/4-language-usage/2-variables-and-types/1-general/g-2135.md
index c9a82a34..35ea09ac 100644
--- a/docs/4-language-usage/2-variables-and-types/1-general/g-2135.md
+++ b/docs/4-language-usage/2-variables-and-types/1-general/g-2135.md
@@ -9,7 +9,7 @@ Expending resources calculating and assigning values to a local variable and nev
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="13"
 create or replace package body my_package is
    procedure my_proc is
       co_employee_id constant employees.employee_id%type := 1042;
@@ -35,7 +35,7 @@ end my_package;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="13 15"
 create or replace package body my_package is
    procedure my_proc is
       co_employee_id constant employees.employee_id%type := 1042;
diff --git a/docs/4-language-usage/2-variables-and-types/1-general/g-2140.md b/docs/4-language-usage/2-variables-and-types/1-general/g-2140.md
index dfff463f..607fbaf6 100644
--- a/docs/4-language-usage/2-variables-and-types/1-general/g-2140.md
+++ b/docs/4-language-usage/2-variables-and-types/1-general/g-2140.md
@@ -9,7 +9,7 @@ Variables are initialized to `null` by default.
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2"
 declare
    l_note big_string_type := null;
 begin
@@ -20,7 +20,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2"
 declare
    l_note big_string_type;
 begin
diff --git a/docs/4-language-usage/2-variables-and-types/1-general/g-2145.md b/docs/4-language-usage/2-variables-and-types/1-general/g-2145.md
index f290e183..ffb40cd0 100644
--- a/docs/4-language-usage/2-variables-and-types/1-general/g-2145.md
+++ b/docs/4-language-usage/2-variables-and-types/1-general/g-2145.md
@@ -9,7 +9,7 @@ There is no reason to assign a variable to itself. It is either a redundant stat
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="8"
 declare
    co_parallel_degree constant types_up.name%type := 'parallel_degree';
    l_function_result  pls_integer;
@@ -26,7 +26,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="8"
 declare
    co_parallel_degree constant types_up.name%type := 'parallel_degree';
    l_function_result  pls_integer;
diff --git a/docs/4-language-usage/2-variables-and-types/1-general/g-2150.md b/docs/4-language-usage/2-variables-and-types/1-general/g-2150.md
index fa7ee9f5..daa7023b 100644
--- a/docs/4-language-usage/2-variables-and-types/1-general/g-2150.md
+++ b/docs/4-language-usage/2-variables-and-types/1-general/g-2150.md
@@ -9,7 +9,7 @@ The `null` value can cause confusion both from the standpoint of code review and
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="4"
 declare
    l_value integer;
 begin
@@ -22,7 +22,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="4"
 declare
    l_value integer;
 begin
diff --git a/docs/4-language-usage/2-variables-and-types/1-general/g-2160.md b/docs/4-language-usage/2-variables-and-types/1-general/g-2160.md
index f80910a6..d71ff50a 100644
--- a/docs/4-language-usage/2-variables-and-types/1-general/g-2160.md
+++ b/docs/4-language-usage/2-variables-and-types/1-general/g-2160.md
@@ -9,7 +9,7 @@ If your initialization fails, you will not be able to handle the error in your e
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="3 4"
 declare
    co_department_id  constant integer := 100;
    l_department_name departments.department_name%type :=
@@ -22,7 +22,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="8"
 declare
    co_department_id  constant integer                          := 100;
    co_unkown_name    constant departments.department_name%type := 'unknown';
diff --git a/docs/4-language-usage/2-variables-and-types/1-general/g-2170.md b/docs/4-language-usage/2-variables-and-types/1-general/g-2170.md
index 49b0fa28..da6b5eba 100644
--- a/docs/4-language-usage/2-variables-and-types/1-general/g-2170.md
+++ b/docs/4-language-usage/2-variables-and-types/1-general/g-2170.md
@@ -9,7 +9,7 @@ The readability of your code will be higher when you do not overload variables.
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="7 11"
 begin
    <<main>>
    declare
@@ -33,7 +33,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="7 11"
 begin
    <<main>>
    declare
diff --git a/docs/4-language-usage/2-variables-and-types/1-general/g-2180.md b/docs/4-language-usage/2-variables-and-types/1-general/g-2180.md
index 58e78e9a..6920458e 100644
--- a/docs/4-language-usage/2-variables-and-types/1-general/g-2180.md
+++ b/docs/4-language-usage/2-variables-and-types/1-general/g-2180.md
@@ -9,7 +9,7 @@ Quoted identifiers make your code hard to read and maintain.
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2-4"
 declare
    "sal+comm"     integer;               -- violates also naming conventions (G-9102)
    "my constant"  constant integer := 1; -- violates also naming conventions (G-9114)
@@ -26,7 +26,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2-4"
 declare
    l_sal_comm     integer;
    co_my_constant constant integer := 1;
diff --git a/docs/4-language-usage/2-variables-and-types/1-general/g-2185.md b/docs/4-language-usage/2-variables-and-types/1-general/g-2185.md
index 2db3217d..79e99fdd 100644
--- a/docs/4-language-usage/2-variables-and-types/1-general/g-2185.md
+++ b/docs/4-language-usage/2-variables-and-types/1-general/g-2185.md
@@ -9,7 +9,7 @@ You should ensure that the name you have chosen well defines its purpose and usa
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2-4"
 declare
    i integer;
    c constant integer := 1; -- violates also naming conventions (G-9114)
@@ -26,7 +26,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2-4"
 declare
    l_sal_comm     integer;
    co_my_constant constant integer := 1;
diff --git a/docs/4-language-usage/2-variables-and-types/1-general/g-2190.md b/docs/4-language-usage/2-variables-and-types/1-general/g-2190.md
index 47da6696..7255a50b 100644
--- a/docs/4-language-usage/2-variables-and-types/1-general/g-2190.md
+++ b/docs/4-language-usage/2-variables-and-types/1-general/g-2190.md
@@ -11,7 +11,7 @@ Use of `rowid` or `urowid` means that your SQL statement will not be portable to
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="7"
 declare
    l_department_name departments.department_name%type;
    l_rowid           rowid;
@@ -25,7 +25,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="7"
 declare
    l_department_name departments.department_name%type;
    l_department_id   departments.department_id%type;
diff --git a/docs/4-language-usage/2-variables-and-types/2-numeric-data-types/g-2210.md b/docs/4-language-usage/2-variables-and-types/2-numeric-data-types/g-2210.md
index 0a7a4e16..07d48200 100644
--- a/docs/4-language-usage/2-variables-and-types/2-numeric-data-types/g-2210.md
+++ b/docs/4-language-usage/2-variables-and-types/2-numeric-data-types/g-2210.md
@@ -9,7 +9,7 @@ If you do not specify precision `number` is defaulted to 38 or the maximum suppo
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2"
 create or replace package types_up is
    subtype salary_type is number;
 end types_up;
@@ -18,7 +18,7 @@ end types_up;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2"
 create or replace package types_up is
    subtype salary_type is number(5,1);
 end types_up;
diff --git a/docs/4-language-usage/2-variables-and-types/2-numeric-data-types/g-2220.md b/docs/4-language-usage/2-variables-and-types/2-numeric-data-types/g-2220.md
index cefdb618..929dff16 100644
--- a/docs/4-language-usage/2-variables-and-types/2-numeric-data-types/g-2220.md
+++ b/docs/4-language-usage/2-variables-and-types/2-numeric-data-types/g-2220.md
@@ -14,7 +14,7 @@ There are many reasons to use `pls_integer` instead of `number`:
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2"
 declare
    l_result       number(9,0)          := 0;   -- violates also G-2130, G-2230
    co_upper_bound constant pls_integer := 1e8;
@@ -33,7 +33,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2"
 declare
    l_result       pls_integer          := 0;
    co_upper_bound constant pls_integer := 1e8;
diff --git a/docs/4-language-usage/2-variables-and-types/2-numeric-data-types/g-2230.md b/docs/4-language-usage/2-variables-and-types/2-numeric-data-types/g-2230.md
index f34a284f..33877977 100644
--- a/docs/4-language-usage/2-variables-and-types/2-numeric-data-types/g-2230.md
+++ b/docs/4-language-usage/2-variables-and-types/2-numeric-data-types/g-2230.md
@@ -12,7 +12,7 @@ With Oracle Database 11g, the new data type `simple_integer` has been introduced
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2"
 declare
    l_result       number(9,0)          := 0;   -- violates also G-2130, G-2220
    co_upper_bound constant pls_integer := 1e8;
@@ -31,7 +31,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2"
 declare
    l_result       simple_integer       := 0;
    co_upper_bound constant pls_integer := 1e8;
diff --git a/docs/4-language-usage/2-variables-and-types/3-character-data-types/g-2310.md b/docs/4-language-usage/2-variables-and-types/3-character-data-types/g-2310.md
index 63d4beca..7756253c 100644
--- a/docs/4-language-usage/2-variables-and-types/3-character-data-types/g-2310.md
+++ b/docs/4-language-usage/2-variables-and-types/3-character-data-types/g-2310.md
@@ -9,7 +9,7 @@
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="3"
 create or replace package types_up
 is
    subtype description_type is char(200);
@@ -19,7 +19,7 @@ end types_up;
 
 Unexpected trailing spaces can lead to wrong results.
 
-```sql
+``` sql hl_lines="4"
 with
    dept as (
       select cast(department_name as varchar2(30 char)) as dname_vc2
@@ -39,7 +39,7 @@ select count(*)
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="3"
 create or replace package types_up
 is
    subtype description_type is varchar2(200 char);
diff --git a/docs/4-language-usage/2-variables-and-types/3-character-data-types/g-2320.md b/docs/4-language-usage/2-variables-and-types/3-character-data-types/g-2320.md
index fa8634d1..b7c6e3a8 100644
--- a/docs/4-language-usage/2-variables-and-types/3-character-data-types/g-2320.md
+++ b/docs/4-language-usage/2-variables-and-types/3-character-data-types/g-2320.md
@@ -9,7 +9,7 @@ Do not use the `varchar` data type. Use the `varchar2` data type instead. Althou
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2"
 create or replace package types_up is
    subtype description_type is varchar(200);
 end types_up;
@@ -18,7 +18,7 @@ end types_up;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2"
 create or replace package types_up is
    subtype description_type is varchar2(200 char);
 end types_up;
diff --git a/docs/4-language-usage/2-variables-and-types/3-character-data-types/g-2330.md b/docs/4-language-usage/2-variables-and-types/3-character-data-types/g-2330.md
index a8292a8b..a4ad1eb8 100644
--- a/docs/4-language-usage/2-variables-and-types/3-character-data-types/g-2330.md
+++ b/docs/4-language-usage/2-variables-and-types/3-character-data-types/g-2330.md
@@ -9,7 +9,7 @@ Today zero-length strings and `null` are currently handled identical by the Orac
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2 8"
 create or replace package body constants_up is
    co_null_string constant types_up.text := '';
 
@@ -25,7 +25,7 @@ end constants_up;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="6"
 create or replace package body constants_up is
    function empty_string return varchar2
       deterministic
diff --git a/docs/4-language-usage/2-variables-and-types/3-character-data-types/g-2340.md b/docs/4-language-usage/2-variables-and-types/3-character-data-types/g-2340.md
index fd9bf7c1..fa08e805 100644
--- a/docs/4-language-usage/2-variables-and-types/3-character-data-types/g-2340.md
+++ b/docs/4-language-usage/2-variables-and-types/3-character-data-types/g-2340.md
@@ -11,7 +11,7 @@ In a multibyte environment a `varchar2(10)` definition may not necessarily hold
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2"
 create or replace package types_up is
    subtype description_type is varchar2(200);
 end types_up;
@@ -20,7 +20,7 @@ end types_up;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2"
 create or replace package types_up is
    subtype description_type is varchar2(200 char);
 end types_up;
diff --git a/docs/4-language-usage/2-variables-and-types/4-boolean-data-types/g-2410.md b/docs/4-language-usage/2-variables-and-types/4-boolean-data-types/g-2410.md
index 6072a302..d621dd44 100644
--- a/docs/4-language-usage/2-variables-and-types/4-boolean-data-types/g-2410.md
+++ b/docs/4-language-usage/2-variables-and-types/4-boolean-data-types/g-2410.md
@@ -9,7 +9,7 @@ The use of `true` and `false` clarifies that this is a boolean value and makes t
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="4"
 declare
    co_newfile constant pls_integer := 1000;
    co_oldfile constant pls_integer := 500;
@@ -27,7 +27,7 @@ end;
 
 ## Example (better)
 
-``` sql
+``` sql hl_lines="4 6"
 declare
    co_newfile constant pls_integer := 1000;
    co_oldfile constant pls_integer := 500;
@@ -45,7 +45,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="4 6"
 declare
    co_newfile constant pls_integer := 1000;
    co_oldfile constant pls_integer := 500;
diff --git a/docs/4-language-usage/2-variables-and-types/5-large-objects/g-2510.md b/docs/4-language-usage/2-variables-and-types/5-large-objects/g-2510.md
index a2d076b4..3b98b831 100644
--- a/docs/4-language-usage/2-variables-and-types/5-large-objects/g-2510.md
+++ b/docs/4-language-usage/2-variables-and-types/5-large-objects/g-2510.md
@@ -11,7 +11,7 @@ There are many constraints to `long` datatypes in comparison to the `lob` types.
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2 3"
 declare
    l_long long;     -- violates also G-2130
    l_raw  long raw; -- violates also G-2130
@@ -24,7 +24,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2 3"
 declare
    l_long clob;
    l_raw  blob;
diff --git a/docs/4-language-usage/2-variables-and-types/6-cursor-variables/g-2610.md b/docs/4-language-usage/2-variables-and-types/6-cursor-variables/g-2610.md
index 2d528f48..0ae2f32d 100644
--- a/docs/4-language-usage/2-variables-and-types/6-cursor-variables/g-2610.md
+++ b/docs/4-language-usage/2-variables-and-types/6-cursor-variables/g-2610.md
@@ -9,7 +9,7 @@ There is no reason to define your own weak ref cursor types, as they are not dif
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2 3"
 declare
    type local_weak_cursor_type is ref cursor;
    c_data local_weak_cursor_type;
@@ -29,7 +29,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2"
 declare
    c_data sys_refcursor;
 begin
diff --git a/docs/4-language-usage/3-dml-and-sql/1-general/g-3110.md b/docs/4-language-usage/3-dml-and-sql/1-general/g-3110.md
index 60b2a2fc..c86f74b5 100644
--- a/docs/4-language-usage/3-dml-and-sql/1-general/g-3110.md
+++ b/docs/4-language-usage/3-dml-and-sql/1-general/g-3110.md
@@ -9,7 +9,7 @@ Data structures often change. Having the target columns in your insert statement
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="4"
 create or replace package body dept_api is
    procedure ins_dept(in_dept_row in dept%rowtype) is
    begin
@@ -27,7 +27,7 @@ end dept_api;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="4-9"
 create or replace package body dept_api is
    procedure ins_dept(in_dept_row in dept%rowtype) is
    begin
diff --git a/docs/4-language-usage/3-dml-and-sql/1-general/g-3115.md b/docs/4-language-usage/3-dml-and-sql/1-general/g-3115.md
index 7dbab1cc..1aa87853 100644
--- a/docs/4-language-usage/3-dml-and-sql/1-general/g-3115.md
+++ b/docs/4-language-usage/3-dml-and-sql/1-general/g-3115.md
@@ -11,14 +11,14 @@ One exception to this rule can be when you attempt to fire cross edition trigger
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2"
 update employees
    set first_name = first_name;
 ```
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2"
 update employees
    set first_name = initcap(first_name);
 ```
\ No newline at end of file
diff --git a/docs/4-language-usage/3-dml-and-sql/1-general/g-3120.md b/docs/4-language-usage/3-dml-and-sql/1-general/g-3120.md
index 4633d5cb..7acc2225 100644
--- a/docs/4-language-usage/3-dml-and-sql/1-general/g-3120.md
+++ b/docs/4-language-usage/3-dml-and-sql/1-general/g-3120.md
@@ -11,7 +11,7 @@ Especially when using subqueries the omission of table aliases may end in unexpe
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="1-3"
 select last_name
       ,first_name
       ,department_name
@@ -23,7 +23,7 @@ select last_name
 
 If the `jobs` table has no `employee_id` column and `employees` has one this query will not raise an error but return all rows of the `employees` table as a subquery is allowed to access columns of all its parent tables - this construct is known as correlated subquery.
 
-``` sql
+``` sql hl_lines="5"
 select last_name
       ,first_name
   from employees
@@ -36,7 +36,7 @@ select last_name
 
 ## Example (better)
 
-``` sql
+``` sql hl_lines="1-3"
 select e.last_name
       ,e.first_name
       ,d.department_name
@@ -50,7 +50,7 @@ select e.last_name
 
 Using meaningful aliases improves the readability of your code.
 
-``` sql
+``` sql hl_lines="1-3"
 select emp.last_name
       ,emp.first_name
       ,dept.department_name
@@ -62,13 +62,13 @@ select emp.last_name
 
 If the `jobs` table has no `employee_id` column this query will return an error due to the directive (given by adding the table alias to the column) to read the `employee_id` column from the `jobs` table.
 
-``` sql
+``` sql hl_lines="5"
 select emp.last_name
       ,emp.first_name
   from employees emp
  where emp.employee_id in (
-          select j.employee_id
-            from jobs j
-           where j.job_title like '%Manager%' -- NOSONAR: G-1050 literal is ok for a standalone query
+          select job.employee_id
+            from jobs job
+           where job.job_title like '%Manager%' -- NOSONAR: G-1050 literal is ok for a standalone query
        );
 ```
diff --git a/docs/4-language-usage/3-dml-and-sql/1-general/g-3130.md b/docs/4-language-usage/3-dml-and-sql/1-general/g-3130.md
index 9b69722b..aa14a796 100644
--- a/docs/4-language-usage/3-dml-and-sql/1-general/g-3130.md
+++ b/docs/4-language-usage/3-dml-and-sql/1-general/g-3130.md
@@ -9,7 +9,7 @@ ANSI SQL-92 join syntax supports the full outer join. A further advantage of the
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="5-7"
 select e.employee_id
       ,e.last_name
       ,e.first_name
@@ -22,7 +22,7 @@ select e.employee_id
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="5-7"
 select emp.employee_id
       ,emp.last_name
       ,emp.first_name
diff --git a/docs/4-language-usage/3-dml-and-sql/1-general/g-3140.md b/docs/4-language-usage/3-dml-and-sql/1-general/g-3140.md
index eb194de4..7067bd73 100644
--- a/docs/4-language-usage/3-dml-and-sql/1-general/g-3140.md
+++ b/docs/4-language-usage/3-dml-and-sql/1-general/g-3140.md
@@ -9,7 +9,7 @@ Using cursor-anchored records as targets for your cursors results enables the po
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="10 15"
 declare
    cursor c_employees is
       select employee_id,first_name,last_name
@@ -33,7 +33,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="8 13"
 declare
    cursor c_employees is
       select employee_id,first_name,last_name
diff --git a/docs/4-language-usage/3-dml-and-sql/1-general/g-3145.md b/docs/4-language-usage/3-dml-and-sql/1-general/g-3145.md
index 98700a2a..fde5bd3a 100644
--- a/docs/4-language-usage/3-dml-and-sql/1-general/g-3145.md
+++ b/docs/4-language-usage/3-dml-and-sql/1-general/g-3145.md
@@ -11,7 +11,7 @@ Exceptions to the rule can be when querying an inline view (where the SELECT \*
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="4"
 begin
    <<raise_salary>>
    for r_employee in (
@@ -31,7 +31,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="4"
 begin
    <<raise_salary>>
    for r_employee in (
diff --git a/docs/4-language-usage/3-dml-and-sql/1-general/g-3150.md b/docs/4-language-usage/3-dml-and-sql/1-general/g-3150.md
index 91669d07..a9088520 100644
--- a/docs/4-language-usage/3-dml-and-sql/1-general/g-3150.md
+++ b/docs/4-language-usage/3-dml-and-sql/1-general/g-3150.md
@@ -13,7 +13,7 @@ An identity column is a surrogate key by design – there is no reason why we sh
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="16"
 create table locations (
    location_id        number(10)        not null
   ,location_name      varchar2(60 char) not null
@@ -36,7 +36,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2"
 create table locations (
    location_id        number(10)  generated always as identity
   ,location_name      varchar2(60 char) not null
diff --git a/docs/4-language-usage/3-dml-and-sql/1-general/g-3160.md b/docs/4-language-usage/3-dml-and-sql/1-general/g-3160.md
index a3429f21..dabce939 100644
--- a/docs/4-language-usage/3-dml-and-sql/1-general/g-3160.md
+++ b/docs/4-language-usage/3-dml-and-sql/1-general/g-3160.md
@@ -18,7 +18,7 @@ Invisible columns may be accessed by explicitly adding them to the column list i
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="9"
 declare
    r_employee employees%rowtype;
    co_id      constant employees.employee_id%type := 107;
@@ -32,7 +32,7 @@ begin
 end;
 /
 ```
-```
+``` hl_lines="2"
 Error report -
 ORA-54017: update operation disallowed on virtual columns
 ORA-06512: at line 9
@@ -40,7 +40,7 @@ ORA-06512: at line 9
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2-3 14"
 alter table employees
    add total_salary invisible generated always as
       (salary + nvl(commission_pct,0) * salary)
diff --git a/docs/4-language-usage/3-dml-and-sql/1-general/g-3170.md b/docs/4-language-usage/3-dml-and-sql/1-general/g-3170.md
index 6bdb44b8..0c46e501 100644
--- a/docs/4-language-usage/3-dml-and-sql/1-general/g-3170.md
+++ b/docs/4-language-usage/3-dml-and-sql/1-general/g-3170.md
@@ -16,7 +16,7 @@ Default values have been nullifiable until Oracle Database 12c. Meaning any tool
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="3"
 create table null_test (
    test_case        number(2) not null
   ,column_defaulted varchar2(10 char) default 'Default')
@@ -27,7 +27,7 @@ insert into null_test(test_case,column_defaulted) values (3,null);    -- NOSONAR
 
 select test_case,column_defaulted from null_test;
 ```
-```
+``` hl_lines="5"
 TEST_CASE  COLUMN_DEF
 ---------  -----------
         1  Value
@@ -37,7 +37,7 @@ TEST_CASE  COLUMN_DEF
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="3"
 create table null_test (
    test_case        number(2) not null
   ,column_defaulted varchar2(10 char) default on null 'Default')
@@ -48,7 +48,7 @@ insert into null_test(test_case,column_defaulted) values (3,null);    -- NOSONAR
 
 select test_case,column_defaulted from null_test;
 ```
-```
+``` hl_lines="5"
  TEST_CASE COLUMN_DEF
 ---------- ----------
          1 Value     
diff --git a/docs/4-language-usage/3-dml-and-sql/1-general/g-3180.md b/docs/4-language-usage/3-dml-and-sql/1-general/g-3180.md
index c7159086..cf5c7d91 100644
--- a/docs/4-language-usage/3-dml-and-sql/1-general/g-3180.md
+++ b/docs/4-language-usage/3-dml-and-sql/1-general/g-3180.md
@@ -9,7 +9,7 @@ If you change your `select` list afterwards the `order by` will still work but o
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="6"
 select upper(first_name)
       ,last_name
       ,salary
@@ -20,7 +20,7 @@ select upper(first_name)
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="6-8"
 select upper(first_name) as first_name
       ,last_name
       ,salary
diff --git a/docs/4-language-usage/3-dml-and-sql/1-general/g-3182.md b/docs/4-language-usage/3-dml-and-sql/1-general/g-3182.md
index 30bbf0b1..1553a2a1 100644
--- a/docs/4-language-usage/3-dml-and-sql/1-general/g-3182.md
+++ b/docs/4-language-usage/3-dml-and-sql/1-general/g-3182.md
@@ -17,7 +17,7 @@ Since the meaning of a `literal` depends on the configuration and database versi
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="4"
 select job_id
       ,sum(salary) as sum_salary
   from employees
@@ -27,7 +27,7 @@ select job_id
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="4"
 select job_id
       ,sum(salary) as sum_salary
   from employees
diff --git a/docs/4-language-usage/3-dml-and-sql/1-general/g-3183.md b/docs/4-language-usage/3-dml-and-sql/1-general/g-3183.md
index dc07edbf..576090a1 100644
--- a/docs/4-language-usage/3-dml-and-sql/1-general/g-3183.md
+++ b/docs/4-language-usage/3-dml-and-sql/1-general/g-3183.md
@@ -15,7 +15,7 @@ Unless you use `rollup`, `cube` or `grouping sets`, it is not necessary to use e
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="4"
 select lower(job_id) as job
       ,sum(salary) as sum_salary
   from employees
@@ -25,7 +25,7 @@ select lower(job_id) as job
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="4"
 select lower(job_id) as job
       ,sum(salary) as sum_salary
   from employees
diff --git a/docs/4-language-usage/3-dml-and-sql/1-general/g-3185.md b/docs/4-language-usage/3-dml-and-sql/1-general/g-3185.md
index 6d5c60a0..2ab96f04 100644
--- a/docs/4-language-usage/3-dml-and-sql/1-general/g-3185.md
+++ b/docs/4-language-usage/3-dml-and-sql/1-general/g-3185.md
@@ -9,7 +9,7 @@ The `rownum` pseudo-column is assigned before the `order by` clause is used, so
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="7"
 select first_name
       ,last_name
       ,salary
@@ -22,7 +22,7 @@ select first_name
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="6-14"
 select first_name
       ,last_name
       ,salary
@@ -43,7 +43,7 @@ select first_name
 
 (Assuming you are using Oracle Database 12c or later.)
 
-``` sql
+``` sql hl_lines="8"
 select first_name
       ,last_name
       ,salary
diff --git a/docs/4-language-usage/3-dml-and-sql/1-general/g-3190.md b/docs/4-language-usage/3-dml-and-sql/1-general/g-3190.md
index d6f49d13..b4a0627e 100644
--- a/docs/4-language-usage/3-dml-and-sql/1-general/g-3190.md
+++ b/docs/4-language-usage/3-dml-and-sql/1-general/g-3190.md
@@ -9,7 +9,7 @@ A `natural join` joins tables on equally named columns. This may comfortably fit
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="5"
 select d.department_name
       ,e.last_name
       ,e.first_name
@@ -25,7 +25,7 @@ Accounting                     Gietz                     William
 Executive                      De Haan                   Lex                 
 ...
 ```
-``` sql
+``` sql hl_lines="8"
 alter table departments add modified_at date default on null sysdate;
 alter table employees add modified_at date default on null sysdate;
 
@@ -43,7 +43,7 @@ No data found
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="5-6"
 select d.department_name
       ,e.last_name
       ,e.first_name
diff --git a/docs/4-language-usage/3-dml-and-sql/1-general/g-3195.md b/docs/4-language-usage/3-dml-and-sql/1-general/g-3195.md
index 1654945e..1bc5f473 100644
--- a/docs/4-language-usage/3-dml-and-sql/1-general/g-3195.md
+++ b/docs/4-language-usage/3-dml-and-sql/1-general/g-3195.md
@@ -9,7 +9,7 @@ Using `like` without at least one wildcard (`%` or `_`) is unclear to a maintain
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="4"
 select e.employee_id
       ,e.last_name
   from employees e
@@ -20,7 +20,7 @@ select e.employee_id
 
 Using a wildcard:
 
-``` sql
+``` sql hl_lines="4"
 select e.employee_id
       ,e.last_name
   from employees e
@@ -29,7 +29,7 @@ select e.employee_id
 
 Change to equality operator instead:
 
-``` sql
+``` sql hl_lines="4"
 select e.employee_id
       ,e.last_name
   from employees e
diff --git a/docs/4-language-usage/3-dml-and-sql/2-bulk-operations/g-3210.md b/docs/4-language-usage/3-dml-and-sql/2-bulk-operations/g-3210.md
index 18f4ee3a..4f9af31c 100644
--- a/docs/4-language-usage/3-dml-and-sql/2-bulk-operations/g-3210.md
+++ b/docs/4-language-usage/3-dml-and-sql/2-bulk-operations/g-3210.md
@@ -11,7 +11,7 @@ Context switches between PL/SQL and SQL are extremely costly. BULK Operations re
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="11-12"
 declare
    t_employee_ids   employee_api.t_employee_ids_type;
    co_increase      constant employees.salary%type          := 0.1;
@@ -33,7 +33,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="10-11"
 declare
    t_employee_ids   employee_api.t_employee_ids_type;
    co_increase      constant employees.salary%type          := 0.1;
diff --git a/docs/4-language-usage/3-dml-and-sql/2-bulk-operations/g-3220.md b/docs/4-language-usage/3-dml-and-sql/2-bulk-operations/g-3220.md
index 97dd7093..a7dc4008 100644
--- a/docs/4-language-usage/3-dml-and-sql/2-bulk-operations/g-3220.md
+++ b/docs/4-language-usage/3-dml-and-sql/2-bulk-operations/g-3220.md
@@ -11,7 +11,7 @@ If your use of `forall` is meant to be atomic (all or nothing), don't use `save
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="12"
 declare
    t_employee_ids   employee_api.t_employee_ids_type;
    co_increase      constant employees.salary%type          := 0.1;
@@ -33,7 +33,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="12 17-22"
 declare
    t_employee_ids   employee_api.t_employee_ids_type;
    co_increase      constant employees.salary%type          := 0.1;
diff --git a/docs/4-language-usage/3-dml-and-sql/3-transaction-control/g-3310.md b/docs/4-language-usage/3-dml-and-sql/3-transaction-control/g-3310.md
index 25fc1cc6..c2106715 100644
--- a/docs/4-language-usage/3-dml-and-sql/3-transaction-control/g-3310.md
+++ b/docs/4-language-usage/3-dml-and-sql/3-transaction-control/g-3310.md
@@ -13,7 +13,7 @@ Doing frequent commits within a cursor loop (all types of loops over cursors, wh
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="22"
 declare
    l_counter          integer                           := 0;
    l_discount         discount.percentage%type;
@@ -48,7 +48,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="19"
 declare
    l_discount    discount.percentage%type;
    co_status_new constant orders.order_status%type := 'New';
@@ -76,7 +76,7 @@ end;
 
 (Assuming suitable foreign key relationship exists to allow updating a join.)
 
-``` sql
+``` sql hl_lines="13"
 declare
    co_status_new constant orders.order_status%type := 'New';
 begin
diff --git a/docs/4-language-usage/3-dml-and-sql/3-transaction-control/g-3320.md b/docs/4-language-usage/3-dml-and-sql/3-transaction-control/g-3320.md
index ddf7f588..2c97bc33 100644
--- a/docs/4-language-usage/3-dml-and-sql/3-transaction-control/g-3320.md
+++ b/docs/4-language-usage/3-dml-and-sql/3-transaction-control/g-3320.md
@@ -9,7 +9,7 @@ Commit inside a non-cursor loop (other loop types than loops over cursors - see
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="10 27"
 declare
    co_upper_bound constant integer               := 5;
    co_max_level   constant integer               := 3;
@@ -46,7 +46,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="26 31 32"
 declare
    co_upper_bound constant integer               := 5;
    co_max_level   constant integer               := 3;
diff --git a/docs/4-language-usage/3-dml-and-sql/3-transaction-control/g-3330.md b/docs/4-language-usage/3-dml-and-sql/3-transaction-control/g-3330.md
index e1b61683..22e0bfeb 100644
--- a/docs/4-language-usage/3-dml-and-sql/3-transaction-control/g-3330.md
+++ b/docs/4-language-usage/3-dml-and-sql/3-transaction-control/g-3330.md
@@ -20,7 +20,7 @@ It is most likely not possible to distinguish legitimate uses of autonomous tran
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="3 7"
 create or replace package body dept_api is
    procedure ins_dept(in_dept_row in dept%rowtype) is
       pragma autonomous_transaction;
@@ -35,7 +35,7 @@ end dept_api;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="6 7"
 create or replace package body dept_api is
    procedure ins_dept(in_dept_row in dept%rowtype) is
    begin
diff --git a/docs/4-language-usage/4-control-structures/1-cursor/g-4110.md b/docs/4-language-usage/4-control-structures/1-cursor/g-4110.md
index 727b303c..073bdb2e 100644
--- a/docs/4-language-usage/4-control-structures/1-cursor/g-4110.md
+++ b/docs/4-language-usage/4-control-structures/1-cursor/g-4110.md
@@ -9,7 +9,7 @@ The readability of your code will be higher when you avoid negative sentences.
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="23"
 declare
    cursor c_employees is
       select *
@@ -42,7 +42,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="23"
 declare
    cursor c_employees is
       select *
diff --git a/docs/4-language-usage/4-control-structures/1-cursor/g-4120.md b/docs/4-language-usage/4-control-structures/1-cursor/g-4120.md
index 7f9e8443..9fc8c421 100644
--- a/docs/4-language-usage/4-control-structures/1-cursor/g-4120.md
+++ b/docs/4-language-usage/4-control-structures/1-cursor/g-4120.md
@@ -11,7 +11,7 @@
 
 The employees table holds 107 rows. The example below will only show 100 rows as the cursor attribute `notfound` is set to true as soon as the number of rows to be fetched defined by the `limit` clause is not fulfilled anymore.
 
-``` sql
+``` sql hl_lines="16"
 declare
    cursor c_employees is
       select *
@@ -45,7 +45,7 @@ end;
 
 This example will show all 107 rows but execute one fetch too much (12 instead of 11).
 
-``` sql
+``` sql hl_lines="16"
 declare
    cursor c_employees is
       select *
@@ -78,7 +78,7 @@ end;
 
 This example does the trick (11 fetches only to process all rows)
 
-``` sql
+``` sql hl_lines="21"
 declare
    cursor c_employees is
       select *
diff --git a/docs/4-language-usage/4-control-structures/1-cursor/g-4130.md b/docs/4-language-usage/4-control-structures/1-cursor/g-4130.md
index 7cd79d7a..4906a103 100644
--- a/docs/4-language-usage/4-control-structures/1-cursor/g-4130.md
+++ b/docs/4-language-usage/4-control-structures/1-cursor/g-4130.md
@@ -9,7 +9,7 @@ Any cursors left open can consume additional memory space (i.e. SGA) within the
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="11"
 create or replace package body employee_api as
    function department_salary(in_dept_id in integer) -- NOSONAR: non-deterministic
       return number is
@@ -31,7 +31,7 @@ end employee_api;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="11 13"
 create or replace package body employee_api as
    function department_salary(in_dept_id in integer) -- NOSONAR: non-deterministic
       return number is
diff --git a/docs/4-language-usage/4-control-structures/1-cursor/g-4140.md b/docs/4-language-usage/4-control-structures/1-cursor/g-4140.md
index f5c3ef5b..8efc3434 100644
--- a/docs/4-language-usage/4-control-structures/1-cursor/g-4140.md
+++ b/docs/4-language-usage/4-control-structures/1-cursor/g-4140.md
@@ -14,7 +14,7 @@ In the following example, a procedure call is inserted between the `delete` stat
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="19-21"
 create or replace package body employee_api as
    co_one constant simple_integer := 1;
    co_msg constant types_up.text  := 'Do something based on ';
@@ -46,7 +46,7 @@ end employee_api;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="20-24"
 create or replace package body employee_api as
    co_one constant simple_integer := 1;
    co_msg constant types_up.text  := 'Do something based on ';
diff --git a/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4210.md b/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4210.md
index f4351d7a..2ff2921b 100644
--- a/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4210.md
+++ b/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4210.md
@@ -9,7 +9,7 @@
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="4-10"
 declare
    l_color types_up.color_code_type;
 begin
@@ -26,7 +26,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="4-11"
 declare
    l_color types_up.color_code_type;
 begin
@@ -37,8 +37,6 @@ begin
          my_package.do_blue();
       when constants_up.co_black then
          my_package.do_black();
-      else
-         null;
    end case;
 end;
 /
diff --git a/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4220.md b/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4220.md
index ddd4ffb0..18a264c4 100644
--- a/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4220.md
+++ b/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4220.md
@@ -9,7 +9,7 @@
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2"
 -- @formatter:off
 select decode(ctry.country_code, constants_up.co_ctry_uk, constants_up.co_lang_english 
                                , constants_up.co_ctry_fr, constants_up.co_lang_french
@@ -20,7 +20,7 @@ select decode(ctry.country_code, constants_up.co_ctry_uk, constants_up.co_lang_e
 
 `null` values can be compared in `decode`:
 
-``` sql
+``` sql hl_lines="4"
 -- @formatter:off
 select decode(ctry.country_code, constants_up.co_ctry_uk, constants_up.co_lang_english 
                                , constants_up.co_ctry_fr, constants_up.co_lang_french
@@ -31,7 +31,7 @@ select decode(ctry.country_code, constants_up.co_ctry_uk, constants_up.co_lang_e
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="1"
 select case ctry.country_code
           when constants_up.co_ctry_uk then
              constants_up.co_lang_english
@@ -47,7 +47,7 @@ select case ctry.country_code
 
 Simple `case` can not compare `null` values, instead the searched `case` expression must be used:
 
-``` sql
+``` sql hl_lines="1 6"
 select case
           when ctry.country_code = constants_up.co_ctry_uk then
              constants_up.co_lang_english
diff --git a/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4230.md b/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4230.md
index bba014d6..32d3f010 100644
--- a/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4230.md
+++ b/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4230.md
@@ -12,14 +12,14 @@ The `coalesce` function does not have this drawback.
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="1"
 select nvl(dummy,my_package.expensive_null(value_in => dummy))
   from dual;
 ```
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="1"
 select coalesce(dummy,my_package.expensive_null(value_in => dummy))
   from dual;
 ```
\ No newline at end of file
diff --git a/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4240.md b/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4240.md
index 7b3b728c..c4b1a7b9 100644
--- a/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4240.md
+++ b/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4240.md
@@ -9,7 +9,7 @@ The `nvl2` function always evaluates all parameters before deciding which one to
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="1-2"
 select nvl2(dummy,my_package.expensive_nn(value_in => dummy)
          ,my_package.expensive_null(value_in => dummy))
   from dual;
@@ -17,7 +17,7 @@ select nvl2(dummy,my_package.expensive_nn(value_in => dummy)
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="1-6"
 select case
           when dummy is null then
              my_package.expensive_null(value_in => dummy)
diff --git a/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4250.md b/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4250.md
index 90090ceb..58fc28e4 100644
--- a/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4250.md
+++ b/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4250.md
@@ -9,7 +9,7 @@ Conditions are evaluated top to bottom in branches of a `case` statement or chai
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="9-10"
 declare
    l_color types_up.color_code_type;
 begin
@@ -29,7 +29,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="9-10"
 declare
    l_color types_up.color_code_type;
 begin
diff --git a/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4260.md b/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4260.md
index cb3ec5a0..44893151 100644
--- a/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4260.md
+++ b/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4260.md
@@ -9,7 +9,7 @@ It is more readable to use the opposite comparison operator instead of inverting
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="4"
 declare
    l_color types_up.color_code_type;
 begin
@@ -22,7 +22,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="4"
 declare
    l_color types_up.color_code_type;
 begin
diff --git a/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4270.md b/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4270.md
index e4ac66d2..b8d6bc70 100644
--- a/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4270.md
+++ b/docs/4-language-usage/4-control-structures/2-case-if-decode-nvl-nvl2-coalesce/g-4270.md
@@ -9,7 +9,7 @@ It is more readable to simply use the boolean value as a condition itself, rathe
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="6"
 declare
    co_string  constant types_up.text := '42';
    l_is_valid boolean;
@@ -24,7 +24,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="6"
 declare
    co_string  constant types_up.text := '42';
    l_is_valid boolean;
diff --git a/docs/4-language-usage/4-control-structures/3-flow-control/g-4310.md b/docs/4-language-usage/4-control-structures/3-flow-control/g-4310.md
index 952932e3..796f1c15 100644
--- a/docs/4-language-usage/4-control-structures/3-flow-control/g-4310.md
+++ b/docs/4-language-usage/4-control-structures/3-flow-control/g-4310.md
@@ -13,7 +13,7 @@
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="23 28 31"
 create or replace package body my_package is
    procedure password_check(in_password in varchar2) is
       co_password    constant dba_users.password%type := in_password;
@@ -54,7 +54,7 @@ end my_package;
 
 ## Example (better)
 
-``` sql
+``` sql hl_lines="27 30"
 create or replace package body my_package is
    procedure password_check(in_password in varchar2) is
       co_password    constant dba_users.password%type := in_password;
@@ -94,7 +94,7 @@ end my_package;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="8"
 create or replace package body my_package is
    procedure password_check(in_password in varchar2) is
       co_password     constant dba_users.password%type := in_password;
diff --git a/docs/4-language-usage/4-control-structures/3-flow-control/g-4320.md b/docs/4-language-usage/4-control-structures/3-flow-control/g-4320.md
index e20e52da..6eb5ace2 100644
--- a/docs/4-language-usage/4-control-structures/3-flow-control/g-4320.md
+++ b/docs/4-language-usage/4-control-structures/3-flow-control/g-4320.md
@@ -9,7 +9,7 @@ It's a good alternative for comments to indicate the start and end of a named lo
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="8 11 13 15 17 20 22 25"
 declare
    i            integer;
    co_min_value constant simple_integer := 1;
@@ -41,7 +41,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="8 12 14 17 19 23 25 29"
 declare
    i            integer;
    co_min_value constant simple_integer := 1;
@@ -67,10 +67,7 @@ begin
    end loop for_loop;
 
    <<process_employees>>
-   for r_employee in (
-      select last_name
-        from employees
-   )
+   for r_employee in (select last_name from employees)
    loop
       sys.dbms_output.put_line(r_employee.last_name);
    end loop process_employees;
diff --git a/docs/4-language-usage/4-control-structures/3-flow-control/g-4325.md b/docs/4-language-usage/4-control-structures/3-flow-control/g-4325.md
index 9fc96121..f82c91f8 100644
--- a/docs/4-language-usage/4-control-structures/3-flow-control/g-4325.md
+++ b/docs/4-language-usage/4-control-structures/3-flow-control/g-4325.md
@@ -9,7 +9,7 @@ Reusing labels inside the scope of another label with the same name leads to con
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="1 6"
 <<my_label>>
 declare
    co_min_value constant simple_integer := 1;
@@ -26,7 +26,7 @@ end my_label;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="1 6"
 <<output_values>>
 declare
    co_min_value constant simple_integer := 1;
diff --git a/docs/4-language-usage/4-control-structures/3-flow-control/g-4330.md b/docs/4-language-usage/4-control-structures/3-flow-control/g-4330.md
index 3ccf2e78..0ff4b702 100644
--- a/docs/4-language-usage/4-control-structures/3-flow-control/g-4330.md
+++ b/docs/4-language-usage/4-control-structures/3-flow-control/g-4330.md
@@ -12,7 +12,7 @@ it should be avoided, whenever possible.
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="10 11"
 declare
    cursor c_employees is
       select employee_id,last_name
@@ -35,7 +35,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="7 8"
 declare
    cursor c_employees is
       select employee_id,last_name
diff --git a/docs/4-language-usage/4-control-structures/3-flow-control/g-4340.md b/docs/4-language-usage/4-control-structures/3-flow-control/g-4340.md
index 8edfce46..f3bbec8f 100644
--- a/docs/4-language-usage/4-control-structures/3-flow-control/g-4340.md
+++ b/docs/4-language-usage/4-control-structures/3-flow-control/g-4340.md
@@ -18,7 +18,7 @@ Please note that:
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="14 15"
 declare
    type t_employee_type is varray(10) of employees.employee_id%type;
    t_employees   t_employee_type;
@@ -43,7 +43,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="10 11"
 declare
    type t_employee_type is varray(10) of employees.employee_id%type;
    t_employees   t_employee_type;
diff --git a/docs/4-language-usage/4-control-structures/3-flow-control/g-4350.md b/docs/4-language-usage/4-control-structures/3-flow-control/g-4350.md
index 50a6d1e6..86c1e148 100644
--- a/docs/4-language-usage/4-control-structures/3-flow-control/g-4350.md
+++ b/docs/4-language-usage/4-control-structures/3-flow-control/g-4350.md
@@ -15,7 +15,7 @@ Please note that:
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="6"
 declare
    type t_employee_type is table of employees.employee_id%type;
    t_employees t_employee_type := t_employee_type();
@@ -33,7 +33,7 @@ end;
 
 Raise an unitialized collection error if `t_employees` is not initialized.
 
-``` sql
+``` sql hl_lines="6"
 declare
    type t_employee_type is table of employees.employee_id%type;
    t_employees t_employee_type := t_employee_type();
@@ -51,7 +51,7 @@ end;
 
 Raises neither an error nor checking whether the array is empty. `t_employees.count()` always returns a `number` (unless the array is not initialized). If the array is empty `count()` returns 0 and therefore the loop will not be entered.
 
-``` sql
+``` sql hl_lines="5 7"
 declare
    type t_employee_type is table of employees.employee_id%type;
    t_employees t_employee_type := t_employee_type();
diff --git a/docs/4-language-usage/4-control-structures/3-flow-control/g-4360.md b/docs/4-language-usage/4-control-structures/3-flow-control/g-4360.md
index d0424be7..756afa04 100644
--- a/docs/4-language-usage/4-control-structures/3-flow-control/g-4360.md
+++ b/docs/4-language-usage/4-control-structures/3-flow-control/g-4360.md
@@ -15,7 +15,7 @@ Please note that:
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="14"
 declare -- raises no_data_found when processing 2nd record
    type t_employee_type is table of employees.employee_id%type;
    t_employees    t_employee_type;
@@ -40,7 +40,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="16"
 declare
    type t_employee_type is table of employees.employee_id%type;
    t_employees    t_employee_type;
diff --git a/docs/4-language-usage/4-control-structures/3-flow-control/g-4365.md b/docs/4-language-usage/4-control-structures/3-flow-control/g-4365.md
index e5394013..6ab04ccc 100644
--- a/docs/4-language-usage/4-control-structures/3-flow-control/g-4365.md
+++ b/docs/4-language-usage/4-control-structures/3-flow-control/g-4365.md
@@ -9,7 +9,7 @@ An unconditional `continue` is either redundant (a `continue` as the last statem
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="6"
 begin
    <<process_employees>>
    loop
@@ -25,7 +25,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="8"
 declare
    co_first_year constant pls_integer := 1900;
 begin
diff --git a/docs/4-language-usage/4-control-structures/3-flow-control/g-4370.md b/docs/4-language-usage/4-control-structures/3-flow-control/g-4370.md
index 2ce10d54..ec462805 100644
--- a/docs/4-language-usage/4-control-structures/3-flow-control/g-4370.md
+++ b/docs/4-language-usage/4-control-structures/3-flow-control/g-4370.md
@@ -9,7 +9,7 @@ A numeric for loop as well as a while loop and a cursor for loop have defined lo
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="9 12 21 24 28 35"
 declare
    i            integer;
    co_min_value constant simple_integer := 1;
@@ -52,7 +52,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="9 20 26"
 declare
    i            integer;
    co_min_value constant simple_integer := 1;
diff --git a/docs/4-language-usage/4-control-structures/3-flow-control/g-4375.md b/docs/4-language-usage/4-control-structures/3-flow-control/g-4375.md
index 6eb8e87c..32c9b649 100644
--- a/docs/4-language-usage/4-control-structures/3-flow-control/g-4375.md
+++ b/docs/4-language-usage/4-control-structures/3-flow-control/g-4375.md
@@ -9,7 +9,7 @@ If you need to use an `exit` statement use its full semantic to make the code ea
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="8-10"
 declare
    co_first_year constant pls_integer := 1900;
 begin
@@ -29,7 +29,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="8"
 declare
    co_first_year constant pls_integer := 1900;
 begin
diff --git a/docs/4-language-usage/4-control-structures/3-flow-control/g-4380.md b/docs/4-language-usage/4-control-structures/3-flow-control/g-4380.md
index 86009ca1..61f246d5 100644
--- a/docs/4-language-usage/4-control-structures/3-flow-control/g-4380.md
+++ b/docs/4-language-usage/4-control-structures/3-flow-control/g-4380.md
@@ -9,7 +9,7 @@ It's a good alternative for comments, especially for nested loops to name the lo
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="23 26"
 declare
    co_init_loop  constant simple_integer           := 0;
    co_increment  constant simple_integer           := 1;
@@ -43,7 +43,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="23"
 declare
    co_init_loop  constant simple_integer           := 0;
    co_increment  constant simple_integer           := 1;
diff --git a/docs/4-language-usage/4-control-structures/3-flow-control/g-4385.md b/docs/4-language-usage/4-control-structures/3-flow-control/g-4385.md
index 1d81a66c..6d26e948 100644
--- a/docs/4-language-usage/4-control-structures/3-flow-control/g-4385.md
+++ b/docs/4-language-usage/4-control-structures/3-flow-control/g-4385.md
@@ -9,7 +9,7 @@ You might process more data than required, which leads to bad performance.
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="8-11"
 declare
    l_employee_found boolean := false;
    cursor c_employees is
@@ -30,7 +30,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="8-11"
 declare
    l_employee_found boolean := false;
    cursor c_employees is
diff --git a/docs/4-language-usage/4-control-structures/3-flow-control/g-4387.md b/docs/4-language-usage/4-control-structures/3-flow-control/g-4387.md
index f54bc74c..313e10bd 100644
--- a/docs/4-language-usage/4-control-structures/3-flow-control/g-4387.md
+++ b/docs/4-language-usage/4-control-structures/3-flow-control/g-4387.md
@@ -15,7 +15,7 @@ A `for loop` can also hide a `no_data_found` exception and the reader cannot det
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="6 9 12"
 create or replace package body employee_api is
    function emp_name(in_empno in integer) return varchar2 is -- NOSONAR: non-deterministic
       l_ename emp.ename%type;
@@ -37,7 +37,7 @@ end employee_api;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="6 8"
 create or replace package body employee_api is
    function emp_name(in_empno in integer) return varchar2 is -- NOSONAR: non-deterministic
       l_ename emp.ename%type;
diff --git a/docs/4-language-usage/4-control-structures/3-flow-control/g-4390.md b/docs/4-language-usage/4-control-structures/3-flow-control/g-4390.md
index ef2ba610..15495b2b 100644
--- a/docs/4-language-usage/4-control-structures/3-flow-control/g-4390.md
+++ b/docs/4-language-usage/4-control-structures/3-flow-control/g-4390.md
@@ -9,7 +9,7 @@ If the loop index is used for anything but traffic control inside the loop, this
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="14"
 declare
    l_row          pls_integer;
    l_value        pls_integer;
@@ -37,7 +37,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="9 13"
 declare
    co_lower_bound constant simple_integer           := 1;
    co_upper_bound constant simple_integer           := 5;
diff --git a/docs/4-language-usage/4-control-structures/3-flow-control/g-4395.md b/docs/4-language-usage/4-control-structures/3-flow-control/g-4395.md
index d8a952f8..7e8e23b8 100644
--- a/docs/4-language-usage/4-control-structures/3-flow-control/g-4395.md
+++ b/docs/4-language-usage/4-control-structures/3-flow-control/g-4395.md
@@ -9,7 +9,7 @@ Your `loop` statement uses a hard-coded value for either its upper or lower boun
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="3"
 begin
    <<for_loop>>
    for i in 1..5
@@ -22,7 +22,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="6"
 declare
    co_lower_bound constant simple_integer := 1;
    co_upper_bound constant simple_integer := 5;
diff --git a/docs/4-language-usage/5-exception-handling/g-5010.md b/docs/4-language-usage/5-exception-handling/g-5010.md
index f22edad4..28008337 100644
--- a/docs/4-language-usage/5-exception-handling/g-5010.md
+++ b/docs/4-language-usage/5-exception-handling/g-5010.md
@@ -20,7 +20,7 @@ This kind of framework should include
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="5 7"
 declare
    co_start constant logger_logs.text%type := 'start';
    co_end   constant logger_logs.text%type := 'end';
@@ -34,7 +34,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="7 9"
 declare 
    -- see https://github.com/OraOpenSource/Logger
    co_start constant logger_logs.text%type  := 'start';
diff --git a/docs/4-language-usage/5-exception-handling/g-5020.md b/docs/4-language-usage/5-exception-handling/g-5020.md
index 95fb4939..0cd14432 100644
--- a/docs/4-language-usage/5-exception-handling/g-5020.md
+++ b/docs/4-language-usage/5-exception-handling/g-5020.md
@@ -10,7 +10,7 @@ but it is better to use named exceptions instead, because it ensures a certain l
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="9"
 declare
    co_no_data_found constant integer := -1;
 begin
@@ -28,7 +28,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="6"
 begin
    my_package.some_processing(); -- some code which raises an exception
 exception
diff --git a/docs/4-language-usage/5-exception-handling/g-5030.md b/docs/4-language-usage/5-exception-handling/g-5030.md
index d53d6676..8de4cccc 100644
--- a/docs/4-language-usage/5-exception-handling/g-5030.md
+++ b/docs/4-language-usage/5-exception-handling/g-5030.md
@@ -11,7 +11,7 @@ This is error-prone because your local declaration overrides the global declarat
 
 Using the code below, we are not able to handle the `no_data_found` exception raised by the `select` statement as we have overwritten that exception handler. In addition, our exception handler doesn't have an exception number assigned, which should be raised when the `select` statement does not find any rows.
 
-``` sql
+``` sql hl_lines="3 13"
 declare
    l_dummy          dual.dummy%type;
    no_data_found    exception; -- violates also naming convention G-9113
@@ -43,7 +43,7 @@ ORA-06512: at line 7
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="3 14"
 declare
    l_dummy          dual.dummy%type;
    e_empty_value    exception;
diff --git a/docs/4-language-usage/5-exception-handling/g-5040.md b/docs/4-language-usage/5-exception-handling/g-5040.md
index b98a4d7b..25228aba 100644
--- a/docs/4-language-usage/5-exception-handling/g-5040.md
+++ b/docs/4-language-usage/5-exception-handling/g-5040.md
@@ -11,7 +11,7 @@ When using a logging framework like Logger, consider making an exception to this
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="4"
 begin
    my_package.some_processing();
 exception
@@ -23,7 +23,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="4"
 begin
    my_package.some_processing();
 exception
@@ -35,7 +35,7 @@ end;
 
 An exception to the rule where `when others` can be good to log the error and then re-raise it:
 
-``` sql
+``` sql hl_lines="4-6"
 begin
    my_package.some_processing();
 exception
diff --git a/docs/4-language-usage/5-exception-handling/g-5050.md b/docs/4-language-usage/5-exception-handling/g-5050.md
index eb66c0a5..7660f871 100644
--- a/docs/4-language-usage/5-exception-handling/g-5050.md
+++ b/docs/4-language-usage/5-exception-handling/g-5050.md
@@ -9,7 +9,7 @@ If you are not very organized in the way you allocate, define and use the error
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="4"
 declare
    co_invalid_emp_text constant types_up.text := 'Invalid employee_id';
 begin
@@ -20,7 +20,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2"
 begin
    err_up.raise(in_error => err.co_invalid_employee_id);
 end;
diff --git a/docs/4-language-usage/5-exception-handling/g-5060.md b/docs/4-language-usage/5-exception-handling/g-5060.md
index d83fe8a9..0c7a0332 100644
--- a/docs/4-language-usage/5-exception-handling/g-5060.md
+++ b/docs/4-language-usage/5-exception-handling/g-5060.md
@@ -13,7 +13,7 @@ The form that this failure takes does not necessarily need to be an exception. W
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="7-8"
 create or replace package body department_api is
    function name_by_id(in_id in departments.department_id%type) -- NOSONAR: non-deterministic
       return departments.department_name%type is
@@ -33,7 +33,7 @@ end department_api;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="7-8 13-17"
 create or replace package body department_api is
    function name_by_id(in_id in departments.department_id%type) -- NOSONAR: non-deterministic
       return departments.department_name%type is
diff --git a/docs/4-language-usage/5-exception-handling/g-5070.md b/docs/4-language-usage/5-exception-handling/g-5070.md
index 9beef1f9..fa250364 100644
--- a/docs/4-language-usage/5-exception-handling/g-5070.md
+++ b/docs/4-language-usage/5-exception-handling/g-5070.md
@@ -13,7 +13,7 @@ Being as specific as possible with the errors raised will allow developers to ch
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2"
 begin
    raise no_data_found;
 end;
@@ -22,7 +22,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="4"
 declare
    e_my_exception exception;
 begin
diff --git a/docs/4-language-usage/5-exception-handling/g-5080.md b/docs/4-language-usage/5-exception-handling/g-5080.md
index d75de554..d4f4c4af 100644
--- a/docs/4-language-usage/5-exception-handling/g-5080.md
+++ b/docs/4-language-usage/5-exception-handling/g-5080.md
@@ -11,7 +11,7 @@ If you use `sqlerrm` or `format_error_stack` to log/display error, you should al
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="19"
 create or replace package body order_api as
    procedure discount_and_recalculate(
       in_customer_id in integer
@@ -39,7 +39,7 @@ end order_api;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="22 24"
 create or replace package body order_api as
    procedure discount_and_recalculate(
       in_customer_id in integer
diff --git a/docs/4-language-usage/6-dynamic-sql/g-6010.md b/docs/4-language-usage/6-dynamic-sql/g-6010.md
index b2ee5faa..702bd3f3 100644
--- a/docs/4-language-usage/6-dynamic-sql/g-6010.md
+++ b/docs/4-language-usage/6-dynamic-sql/g-6010.md
@@ -9,7 +9,7 @@ Having the executed statement in a variable makes it easier to debug your code (
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="4"
 declare
    l_next_val employees.employee_id%type;
 begin
@@ -21,7 +21,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="6"
 declare
    l_next_val employees.employee_id%type;
    co_sql     constant types_up.big_string_type :=
diff --git a/docs/4-language-usage/6-dynamic-sql/g-6020.md b/docs/4-language-usage/6-dynamic-sql/g-6020.md
index e9da6941..9db6a0e0 100644
--- a/docs/4-language-usage/6-dynamic-sql/g-6020.md
+++ b/docs/4-language-usage/6-dynamic-sql/g-6020.md
@@ -12,7 +12,7 @@ You should use the `returning into` clause for values returned from a DML operat
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="16"
 create or replace package body employee_api is
    procedure upd_salary(
       in_employee_id  in  employees.employee_id%type
@@ -36,7 +36,7 @@ end employee_api;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="17"
 create or replace package body employee_api is
    procedure upd_salary(
       in_employee_id  in  employees.employee_id%type
diff --git a/docs/4-language-usage/7-stored-objects/1-general/g-7110.md b/docs/4-language-usage/7-stored-objects/1-general/g-7110.md
index 4c332bfc..01cafe98 100644
--- a/docs/4-language-usage/7-stored-objects/1-general/g-7110.md
+++ b/docs/4-language-usage/7-stored-objects/1-general/g-7110.md
@@ -11,7 +11,7 @@ This is not needed for standard functions like (`to_char`, `to_date`, `nvl`, `ro
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="5"
 declare
    r_employee employees%rowtype;
    co_id      constant employees.employee_id%type := 107;
@@ -23,7 +23,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="6 7"
 declare
    r_employee employees%rowtype;
    co_id      constant employees.employee_id%type := 107;
diff --git a/docs/4-language-usage/7-stored-objects/1-general/g-7120.md b/docs/4-language-usage/7-stored-objects/1-general/g-7120.md
index a51a9c5f..8e921622 100644
--- a/docs/4-language-usage/7-stored-objects/1-general/g-7120.md
+++ b/docs/4-language-usage/7-stored-objects/1-general/g-7120.md
@@ -9,10 +9,9 @@ It's a good alternative for comments to indicate the end of program units, espec
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="18 19"
 create or replace package body employee_api is
-   function -- NOSONAR: non-deterministic
-   employee_by_id(in_employee_id in integer)
+   function employee_by_id(in_employee_id in integer) -- NOSONAR: non-deterministic
       return employees%rowtype is
       co_employee_id constant employees.employee_id%type := in_employee_id;
       r_employee     employees%rowtype;
@@ -35,7 +34,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="18 19"
 create or replace package body employee_api is
    function employee_by_id(in_employee_id in integer) -- NOSONAR: non-deterministic
       return employees%rowtype is
diff --git a/docs/4-language-usage/7-stored-objects/1-general/g-7125.md b/docs/4-language-usage/7-stored-objects/1-general/g-7125.md
index 01133a55..f863ddba 100644
--- a/docs/4-language-usage/7-stored-objects/1-general/g-7125.md
+++ b/docs/4-language-usage/7-stored-objects/1-general/g-7125.md
@@ -9,7 +9,7 @@ Using `create` alone makes your scripts give an error if the program unit alread
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="1"
 create package body employee_api is
    function employee_by_id(in_employee_id in integer) -- NOSONAR: non-deterministic
       return employees%rowtype is
@@ -34,7 +34,7 @@ end employee_api;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="1"
 create or replace package body employee_api is
    function employee_by_id(in_employee_id in integer) -- NOSONAR: non-deterministic
       return employees%rowtype is
diff --git a/docs/4-language-usage/7-stored-objects/1-general/g-7130.md b/docs/4-language-usage/7-stored-objects/1-general/g-7130.md
index b119e783..075aaa8e 100644
--- a/docs/4-language-usage/7-stored-objects/1-general/g-7130.md
+++ b/docs/4-language-usage/7-stored-objects/1-general/g-7130.md
@@ -11,7 +11,7 @@ This external dependency is hidden, and may cause problems in the future. You sh
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="6 9 10"
 create or replace package body employee_api is
    procedure calc_salary(in_employee_id in integer) is
       co_employee_id constant employees.employee_id%type := in_employee_id;
@@ -45,7 +45,7 @@ end employee_api;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="7 8 17 18"
 create or replace package body employee_api is
    procedure calc_salary(in_employee_id in integer) is
       co_employee_id constant employees.employee_id%type := in_employee_id;
diff --git a/docs/4-language-usage/7-stored-objects/1-general/g-7140.md b/docs/4-language-usage/7-stored-objects/1-general/g-7140.md
index 8b77cdfc..d9afa648 100644
--- a/docs/4-language-usage/7-stored-objects/1-general/g-7140.md
+++ b/docs/4-language-usage/7-stored-objects/1-general/g-7140.md
@@ -13,7 +13,7 @@ There is never a better time to review all the steps you took, and to understand
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="3"
 create or replace package body my_package is
    procedure my_procedure is
       function my_func return number
@@ -32,7 +32,7 @@ end my_package;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="3 11"
 create or replace package body my_package is
    procedure my_procedure is
       function my_func return number
diff --git a/docs/4-language-usage/7-stored-objects/1-general/g-7150.md b/docs/4-language-usage/7-stored-objects/1-general/g-7150.md
index 4a56646a..a2ddd06f 100644
--- a/docs/4-language-usage/7-stored-objects/1-general/g-7150.md
+++ b/docs/4-language-usage/7-stored-objects/1-general/g-7150.md
@@ -9,7 +9,7 @@ You should go through your programs and remove any parameter that is no longer u
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="4"
 create or replace package body department_api is
    function name_by_id( -- NOSONAR: non-deterministic
       in_department_id in integer
diff --git a/docs/4-language-usage/7-stored-objects/1-general/g-7160.md b/docs/4-language-usage/7-stored-objects/1-general/g-7160.md
index 9b9dd239..4c7a6a22 100644
--- a/docs/4-language-usage/7-stored-objects/1-general/g-7160.md
+++ b/docs/4-language-usage/7-stored-objects/1-general/g-7160.md
@@ -9,7 +9,7 @@ By showing the mode of parameters, you help the reader. If you do not specify a
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="3-6"
 create or replace package employee_api is
    procedure store(io_id       in out employees.id%type
                   ,in_first_name      employees.first_name%type
@@ -23,7 +23,7 @@ end employee_up;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="3-6"
 create or replace package employee_api is
    procedure store(io_id            in out employees.id%type
                   ,in_first_name    in     employees.first_name%type
diff --git a/docs/4-language-usage/7-stored-objects/1-general/g-7170.md b/docs/4-language-usage/7-stored-objects/1-general/g-7170.md
index 92b8401c..91c285f6 100644
--- a/docs/4-language-usage/7-stored-objects/1-general/g-7170.md
+++ b/docs/4-language-usage/7-stored-objects/1-general/g-7170.md
@@ -12,7 +12,7 @@ Avoid using parameter mode `in out` unless you actually use the parameter both a
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="3-12"
 create or replace package body employee_up is
    procedure rcv_emp(
       io_first_name     in out employees.first_name%type
@@ -56,7 +56,7 @@ end employee_up;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="3-12"
 create or replace package body employee_up is
    procedure rcv_emp(
       out_first_name     out employees.first_name%type
diff --git a/docs/4-language-usage/7-stored-objects/2-packages/g-7220.md b/docs/4-language-usage/7-stored-objects/2-packages/g-7220.md
index 8bbf2f19..58dbaabb 100644
--- a/docs/4-language-usage/7-stored-objects/2-packages/g-7220.md
+++ b/docs/4-language-usage/7-stored-objects/2-packages/g-7220.md
@@ -9,7 +9,7 @@ Having forward declarations allows you to order the functions and procedures of
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="7"
 create or replace package department_api is
    procedure del(in_department_id in departments.department_id%type);
 end department_api;
@@ -48,7 +48,7 @@ end department_api;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="7 18"
 create or replace package department_api is
    procedure del(in_department_id in departments.department_id%type);
 end department_api;
diff --git a/docs/4-language-usage/7-stored-objects/2-packages/g-7230.md b/docs/4-language-usage/7-stored-objects/2-packages/g-7230.md
index 250d78d6..e852703f 100644
--- a/docs/4-language-usage/7-stored-objects/2-packages/g-7230.md
+++ b/docs/4-language-usage/7-stored-objects/2-packages/g-7230.md
@@ -15,7 +15,7 @@ For package-level constants, consider whether the constant should be public and
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="4"
 create or replace package employee_api as
    co_min_increase constant types_up.sal_increase_type := 0.01;
    co_max_increase constant types_up.sal_increase_type := 0.5;
@@ -44,7 +44,7 @@ end employee_api;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="14"
 create or replace package constants_up as
    co_min_increase constant types_up.sal_increase_type := 0.01;
    co_max_increase constant types_up.sal_increase_type := 0.5;
diff --git a/docs/4-language-usage/7-stored-objects/2-packages/g-7250.md b/docs/4-language-usage/7-stored-objects/2-packages/g-7250.md
index fe8af638..30549d12 100644
--- a/docs/4-language-usage/7-stored-objects/2-packages/g-7250.md
+++ b/docs/4-language-usage/7-stored-objects/2-packages/g-7250.md
@@ -9,7 +9,7 @@ The purpose of the initialization block of a package body is to set initial valu
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="17-19"
 create or replace package body employee_api as
    g_salary_increase types_up.sal_increase_type;
 
@@ -37,7 +37,7 @@ end employee_api;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="17"
 create or replace package body employee_api as
    g_salary_increase types_up.sal_increase_type;
 
diff --git a/docs/4-language-usage/7-stored-objects/3-procedures/g-7310.md b/docs/4-language-usage/7-stored-objects/3-procedures/g-7310.md
index f832ea85..a127d306 100644
--- a/docs/4-language-usage/7-stored-objects/3-procedures/g-7310.md
+++ b/docs/4-language-usage/7-stored-objects/3-procedures/g-7310.md
@@ -11,7 +11,7 @@ Package bodies may be changed and compiled without invalidating other packages.
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="1"
 create or replace procedure my_procedure is
 begin
    null;
@@ -21,7 +21,7 @@ end my_procedure;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="7"
 create or replace package my_package is
    procedure my_procedure;
 end my_package;
diff --git a/docs/4-language-usage/7-stored-objects/3-procedures/g-7320.md b/docs/4-language-usage/7-stored-objects/3-procedures/g-7320.md
index f7e6ae87..302123d9 100644
--- a/docs/4-language-usage/7-stored-objects/3-procedures/g-7320.md
+++ b/docs/4-language-usage/7-stored-objects/3-procedures/g-7320.md
@@ -11,7 +11,7 @@ A good general rule to follow as you write your PL/SQL programs is "one way in a
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="9"
 create or replace package body my_package is
    procedure my_procedure is
       l_idx     simple_integer          := 1;
@@ -32,7 +32,7 @@ end my_package;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="8"
 create or replace package body my_package is
    procedure my_procedure is
       l_idx     simple_integer          := 1;
diff --git a/docs/4-language-usage/7-stored-objects/3-procedures/g-7330.md b/docs/4-language-usage/7-stored-objects/3-procedures/g-7330.md
index 50902f86..0ea69ab9 100644
--- a/docs/4-language-usage/7-stored-objects/3-procedures/g-7330.md
+++ b/docs/4-language-usage/7-stored-objects/3-procedures/g-7330.md
@@ -9,7 +9,7 @@ Marking a parameter for output means that callers will expect its value to be up
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="4"
 create or replace package body my_package is
    procedure greet(
       in_name      in  varchar2
@@ -27,7 +27,7 @@ end my_package;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="4 9"
 create or replace package body my_package is
    procedure greet(
       in_name      in  varchar2
diff --git a/docs/4-language-usage/7-stored-objects/4-functions/g-7410.md b/docs/4-language-usage/7-stored-objects/4-functions/g-7410.md
index a82bb08e..38bbf4a4 100644
--- a/docs/4-language-usage/7-stored-objects/4-functions/g-7410.md
+++ b/docs/4-language-usage/7-stored-objects/4-functions/g-7410.md
@@ -11,7 +11,7 @@ Package bodies may be changed and compiled without invalidating other packages.
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="1"
 create or replace function my_function return varchar2
    deterministic
 is
@@ -23,7 +23,7 @@ end my_function;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2"
 create or replace package body my_package is
    function my_function return varchar2
       deterministic
diff --git a/docs/4-language-usage/7-stored-objects/4-functions/g-7420.md b/docs/4-language-usage/7-stored-objects/4-functions/g-7420.md
index b267e88a..964d368c 100644
--- a/docs/4-language-usage/7-stored-objects/4-functions/g-7420.md
+++ b/docs/4-language-usage/7-stored-objects/4-functions/g-7420.md
@@ -9,7 +9,7 @@ The reader expects the `return` statement to be the last statement of a function
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="16"
 create or replace package body my_package is
    function my_function(
       in_from in pls_integer
@@ -35,7 +35,7 @@ end my_package;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="16"
 create or replace package body my_package is
    function my_function(
       in_from in pls_integer
diff --git a/docs/4-language-usage/7-stored-objects/4-functions/g-7430.md b/docs/4-language-usage/7-stored-objects/4-functions/g-7430.md
index df5968c7..d5429d33 100644
--- a/docs/4-language-usage/7-stored-objects/4-functions/g-7430.md
+++ b/docs/4-language-usage/7-stored-objects/4-functions/g-7430.md
@@ -9,7 +9,7 @@ A function should have a single point of entry as well as a single exit-point.
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="8 10"
 create or replace package body my_package is
    function my_function(in_value in pls_integer) return boolean
       deterministic
@@ -28,7 +28,7 @@ end my_package;
 
 ## Example (better)
 
-``` sql
+``` sql hl_lines="14"
 create or replace package body my_package is
    function my_function(in_value in pls_integer) return boolean
       deterministic
@@ -50,7 +50,7 @@ end my_package;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="7"
 create or replace package body my_package is
    function my_function(in_value in pls_integer) return boolean
       deterministic
diff --git a/docs/4-language-usage/7-stored-objects/4-functions/g-7440.md b/docs/4-language-usage/7-stored-objects/4-functions/g-7440.md
index 30a4499a..095c8d46 100644
--- a/docs/4-language-usage/7-stored-objects/4-functions/g-7440.md
+++ b/docs/4-language-usage/7-stored-objects/4-functions/g-7440.md
@@ -9,7 +9,7 @@ A function should return all its data through the `return` clause. Having an `ou
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2"
 create or replace package body my_package is
    function my_function(out_date out date) return boolean
       deterministic
@@ -24,7 +24,7 @@ end my_package;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2"
 create or replace package body my_package is
    function my_function return date
       deterministic
diff --git a/docs/4-language-usage/7-stored-objects/4-functions/g-7450.md b/docs/4-language-usage/7-stored-objects/4-functions/g-7450.md
index d26633cb..47c0a203 100644
--- a/docs/4-language-usage/7-stored-objects/4-functions/g-7450.md
+++ b/docs/4-language-usage/7-stored-objects/4-functions/g-7450.md
@@ -9,7 +9,7 @@ If a boolean function returns `null`, the caller has do deal with it. This makes
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="6"
 create or replace package body my_package is
    function my_function return boolean
       deterministic
@@ -23,7 +23,7 @@ end my_package;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="6"
 create or replace package body my_package is
    function my_function return boolean
       deterministic
diff --git a/docs/4-language-usage/7-stored-objects/4-functions/g-7460.md b/docs/4-language-usage/7-stored-objects/4-functions/g-7460.md
index 83c8dcd5..a16c3e60 100644
--- a/docs/4-language-usage/7-stored-objects/4-functions/g-7460.md
+++ b/docs/4-language-usage/7-stored-objects/4-functions/g-7460.md
@@ -9,7 +9,7 @@ A deterministic function (always return same result for identical parameters) wh
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="3"
 create or replace package department_api is
    function name_by_id(in_department_id in departments.department_id%type)
       return departments.department_name%type;
@@ -19,7 +19,7 @@ end department_api;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="3 4"
 create or replace package department_api is
    function name_by_id(in_department_id in departments.department_id%type)
       return departments.department_name%type
diff --git a/docs/4-language-usage/7-stored-objects/5-oracle-supplied-packages/g-7510.md b/docs/4-language-usage/7-stored-objects/5-oracle-supplied-packages/g-7510.md
index 2be0b0d7..b3873e45 100644
--- a/docs/4-language-usage/7-stored-objects/5-oracle-supplied-packages/g-7510.md
+++ b/docs/4-language-usage/7-stored-objects/5-oracle-supplied-packages/g-7510.md
@@ -9,7 +9,7 @@ The signature of Oracle supplied packages is well known and therefore it is quit
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="4"
 declare
    co_hello_world constant string(30 char) := 'Hello World';
 begin
@@ -20,7 +20,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="4"
 declare
    co_hello_world constant string(30 char) := 'Hello World';
 begin
diff --git a/docs/4-language-usage/7-stored-objects/7-triggers/g-7710.md b/docs/4-language-usage/7-stored-objects/7-triggers/g-7710.md
index cd6496b3..83bfcc89 100644
--- a/docs/4-language-usage/7-stored-objects/7-triggers/g-7710.md
+++ b/docs/4-language-usage/7-stored-objects/7-triggers/g-7710.md
@@ -9,7 +9,7 @@ Having triggers that act on other tables in a way that causes triggers on that t
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="4 19 21"
 create or replace trigger dept_br_u
 before update on departments for each row
 begin
@@ -44,7 +44,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="4 17"
 create or replace trigger dept_br_u
 before update on departments for each row
 begin
diff --git a/docs/4-language-usage/7-stored-objects/7-triggers/g-7720.md b/docs/4-language-usage/7-stored-objects/7-triggers/g-7720.md
index 862c9ab5..e3319f0f 100644
--- a/docs/4-language-usage/7-stored-objects/7-triggers/g-7720.md
+++ b/docs/4-language-usage/7-stored-objects/7-triggers/g-7720.md
@@ -9,7 +9,7 @@ A DML trigger can have multiple triggering events separated by `or` like `before
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2"
 create or replace trigger dept_br_u
 before update of department_id or update of department_name -- violates also G-7730
 on departments for each row
@@ -29,7 +29,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2"
 create or replace trigger dept_br_u
 before update of department_id,department_name
 on departments for each row
diff --git a/docs/4-language-usage/7-stored-objects/7-triggers/g-7730.md b/docs/4-language-usage/7-stored-objects/7-triggers/g-7730.md
index eb36b147..1da0312d 100644
--- a/docs/4-language-usage/7-stored-objects/7-triggers/g-7730.md
+++ b/docs/4-language-usage/7-stored-objects/7-triggers/g-7730.md
@@ -11,7 +11,7 @@ If the trigger makes assignment to a primary key and there are child tables with
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2"
 create or replace trigger dept_br_iu
 before insert or update
 on departments for each row
@@ -28,7 +28,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2 10"
 create or replace trigger dept_br_i
 before insert
 on departments for each row
diff --git a/docs/4-language-usage/7-stored-objects/7-triggers/g-7740.md b/docs/4-language-usage/7-stored-objects/7-triggers/g-7740.md
index 92db74cc..52800e3a 100644
--- a/docs/4-language-usage/7-stored-objects/7-triggers/g-7740.md
+++ b/docs/4-language-usage/7-stored-objects/7-triggers/g-7740.md
@@ -14,7 +14,7 @@ This locking of child tables behaviour goes for simple DML triggers as well as c
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="2 6"
 create or replace trigger dept_br_iu
 before insert or update -- NOSONAR: G-7730
 on departments for each row
@@ -32,7 +32,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="2 5 11"
 create or replace trigger dept_br_i
 before insert
 on departments for each row
diff --git a/docs/4-language-usage/7-stored-objects/8-sequences/g-7810.md b/docs/4-language-usage/7-stored-objects/8-sequences/g-7810.md
index bb74db5a..891f3d57 100644
--- a/docs/4-language-usage/7-stored-objects/8-sequences/g-7810.md
+++ b/docs/4-language-usage/7-stored-objects/8-sequences/g-7810.md
@@ -9,7 +9,7 @@ Since Oracle Database 11g it is no longer needed to use a `select` statement to
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="4"
 declare
    l_sequence_number employees.employee_id%type;
 begin
@@ -23,7 +23,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="4"
 declare
    l_sequence_number employees.employee_id%type;
 begin
diff --git a/docs/4-language-usage/7-stored-objects/9-sql-macros/g-7910.md b/docs/4-language-usage/7-stored-objects/9-sql-macros/g-7910.md
index f25e530c..234187da 100644
--- a/docs/4-language-usage/7-stored-objects/9-sql-macros/g-7910.md
+++ b/docs/4-language-usage/7-stored-objects/9-sql-macros/g-7910.md
@@ -15,7 +15,7 @@ Logging macro calls via a call to a procedure that does DML in an autonomous tra
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="5-7"
 create or replace package body my_package is
    function row_generator(in_num_rows in number) -- NOSONAR: non-deterministic
       return varchar2 sql_macro as
diff --git a/docs/4-language-usage/8-patterns/1-checking-the-number-of-rows/g-8110.md b/docs/4-language-usage/8-patterns/1-checking-the-number-of-rows/g-8110.md
index 8407b9ae..34cd29ea 100644
--- a/docs/4-language-usage/8-patterns/1-checking-the-number-of-rows/g-8110.md
+++ b/docs/4-language-usage/8-patterns/1-checking-the-number-of-rows/g-8110.md
@@ -9,7 +9,7 @@ If you do a `select count(*)` all rows will be read according to the `where` cla
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="6"
 declare
    l_count   pls_integer;
    co_zero   constant simple_integer        := 0;
@@ -37,7 +37,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="8"
 declare
    co_salary constant employees.salary%type := 5000;
 begin
diff --git a/docs/4-language-usage/8-patterns/1-checking-the-number-of-rows/g-8120.md b/docs/4-language-usage/8-patterns/1-checking-the-number-of-rows/g-8120.md
index 959c009a..f69e7208 100644
--- a/docs/4-language-usage/8-patterns/1-checking-the-number-of-rows/g-8120.md
+++ b/docs/4-language-usage/8-patterns/1-checking-the-number-of-rows/g-8120.md
@@ -9,7 +9,7 @@ The result of an existence check is a snapshot of the current situation. You nev
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="10 11"
 create or replace package body department_api is
    procedure ins(in_r_department in departments%rowtype) is
       l_count pls_integer;
@@ -30,7 +30,7 @@ end department_api;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="4 7"
 create or replace package body department_api is
    procedure ins(in_r_department in departments%rowtype) is
    begin
diff --git a/docs/4-language-usage/8-patterns/2-access-objects-of-foreign-application-schemas/g-8210.md b/docs/4-language-usage/8-patterns/2-access-objects-of-foreign-application-schemas/g-8210.md
index 88726ca3..d085708a 100644
--- a/docs/4-language-usage/8-patterns/2-access-objects-of-foreign-application-schemas/g-8210.md
+++ b/docs/4-language-usage/8-patterns/2-access-objects-of-foreign-application-schemas/g-8210.md
@@ -9,7 +9,7 @@ If a connection is needed to a table that is placed in a foreign schema, using s
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="7"
 declare
    l_product_name oe.products.product_name%type;
    co_price       constant oe.products@list_price%type := 1000;
@@ -29,7 +29,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="1 9"
 create synonym oe_products for oe.products;
 
 declare
diff --git a/docs/4-language-usage/8-patterns/3-validating-input-parameter-size/g-8310.md b/docs/4-language-usage/8-patterns/3-validating-input-parameter-size/g-8310.md
index 95035ded..7f0bc30a 100644
--- a/docs/4-language-usage/8-patterns/3-validating-input-parameter-size/g-8310.md
+++ b/docs/4-language-usage/8-patterns/3-validating-input-parameter-size/g-8310.md
@@ -23,7 +23,7 @@ To limit the number of false positives, only the following data types used in pa
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="3"
 create or replace package body department_api is
    function dept_by_name( -- NOSONAR: non-deterministic
       in_dept_name in departments.department_name%type
@@ -56,7 +56,7 @@ end department_api;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="3 6"
 create or replace package body department_api is
    function dept_by_name( -- NOSONAR: non-deterministic
       in_dept_name in departments.department_name%type
@@ -86,7 +86,7 @@ end department_api;
 
 The exception should be handled where the function is called, like this:
 
-``` sql
+``` sql hl_lines="8"
 declare
    co_dept_name constant type_up.text := 'Far to long name of a department';
 begin
diff --git a/docs/4-language-usage/8-patterns/4-ensure-single-execution-at-a-time-of-a-program-unit/g-8410.md b/docs/4-language-usage/8-patterns/4-ensure-single-execution-at-a-time-of-a-program-unit/g-8410.md
index f7b41e97..abda8df0 100644
--- a/docs/4-language-usage/8-patterns/4-ensure-single-execution-at-a-time-of-a-program-unit/g-8410.md
+++ b/docs/4-language-usage/8-patterns/4-ensure-single-execution-at-a-time-of-a-program-unit/g-8410.md
@@ -14,7 +14,7 @@ The alternative using a table where a “Lock-Row” is stored has the disadvant
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="12 18"
 /* Example */
 create or replace package body lock_up is
    -- manage locks in a dedicated table created as follows:
@@ -59,7 +59,7 @@ end;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="17 32"
 /* Example */
 create or replace package body lock_up is
    function request_lock( -- NOSONAR: non-deterministic
diff --git a/docs/4-language-usage/8-patterns/5-use-dbms-application-info-package-to-follow-progress-of-a-process/g-8510.md b/docs/4-language-usage/8-patterns/5-use-dbms-application-info-package-to-follow-progress-of-a-process/g-8510.md
index ccb38196..75484611 100644
--- a/docs/4-language-usage/8-patterns/5-use-dbms-application-info-package-to-follow-progress-of-a-process/g-8510.md
+++ b/docs/4-language-usage/8-patterns/5-use-dbms-application-info-package-to-follow-progress-of-a-process/g-8510.md
@@ -12,7 +12,7 @@ This technique allows us to view progress of a process without having to persist
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="12 18"
 create or replace package body employee_api is
    procedure process_emps is
    begin
@@ -33,7 +33,7 @@ end employee_api;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="18"
 create or replace package body employee_api is
    procedure process_emps is
       co_action_name constant v$session.action%type := 'init';
diff --git a/docs/4-language-usage/9-function-usage/g-9010.md b/docs/4-language-usage/9-function-usage/g-9010.md
index c0c0c038..68f51238 100644
--- a/docs/4-language-usage/9-function-usage/g-9010.md
+++ b/docs/4-language-usage/9-function-usage/g-9010.md
@@ -11,7 +11,7 @@ Using an explicit format model for string to `date` or `timestamp` conversion av
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="10"
 create or replace package body employee_api is
    procedure set_dob(
       in_employee_id in employees.employee_id%type
@@ -30,7 +30,7 @@ end employee_api;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="12"
 create or replace package body employee_api is
    procedure set_dob(
       in_employee_id in employees.employee_id%type
diff --git a/docs/4-language-usage/9-function-usage/g-9020.md b/docs/4-language-usage/9-function-usage/g-9020.md
index 874f8897..1c9843db 100644
--- a/docs/4-language-usage/9-function-usage/g-9020.md
+++ b/docs/4-language-usage/9-function-usage/g-9020.md
@@ -11,7 +11,7 @@ To avoid an inappropriate dependability on configurable NLS parameters, try to u
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="10"
 create or replace package body employee_api is
    procedure set_salary(
       in_employee_id in employees.employee_id%type
@@ -30,7 +30,7 @@ end employee_api;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="12 13"
 create or replace package body employee_api is
    procedure set_salary(
       in_employee_id in employees.employee_id%type
diff --git a/docs/4-language-usage/9-function-usage/g-9030.md b/docs/4-language-usage/9-function-usage/g-9030.md
index 28ecccd3..63469f20 100644
--- a/docs/4-language-usage/9-function-usage/g-9030.md
+++ b/docs/4-language-usage/9-function-usage/g-9030.md
@@ -13,7 +13,7 @@ When converting from strings to other datatypes using a conversion function that
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="10"
 create or replace package body employee_api is
    procedure set_dob(
       in_employee_id in employees.employee_id%type
@@ -32,7 +32,7 @@ end employee_api;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="11"
 create or replace package body employee_api is
    procedure set_dob(
       in_employee_id in employees.employee_id%type
diff --git a/docs/4-language-usage/9-function-usage/g-9040.md b/docs/4-language-usage/9-function-usage/g-9040.md
index 6404d323..109e381e 100644
--- a/docs/4-language-usage/9-function-usage/g-9040.md
+++ b/docs/4-language-usage/9-function-usage/g-9040.md
@@ -13,7 +13,7 @@ The exception to this rule can be if you are converting textual input typed by a
 
 ## Example (bad)
 
-``` sql
+``` sql hl_lines="12"
 create or replace package body employee_api is
    procedure set_dob(
       in_employee_id in employees.employee_id%type
@@ -35,7 +35,7 @@ end employee_api;
 
 ## Example (good)
 
-``` sql
+``` sql hl_lines="12"
 create or replace package body employee_api is
    procedure set_dob(
       in_employee_id in employees.employee_id%type
diff --git a/docs/stylesheets/extra.css b/docs/stylesheets/extra.css
index d25833ac..45c8c150 100644
--- a/docs/stylesheets/extra.css
+++ b/docs/stylesheets/extra.css
@@ -46,6 +46,10 @@
     color: #ff1744;
 }
 
+.highlight .hll {
+    background-color: rgba(215, 215, 215, .5);
+}
+
 /* fixing colors because wkhtmltopdf does not understand colors such as "var(--md-typeset-a-color);" */
 @media print {