diff --git a/include/tidyenum.h b/include/tidyenum.h
index 36407c1b..111f52b4 100644
--- a/include/tidyenum.h
+++ b/include/tidyenum.h
@@ -1129,6 +1129,7 @@ typedef enum
   TidyAttr_PROMPT,                 /**< PROMPT= */
   TidyAttr_RBSPAN,                 /**< RBSPAN= */
   TidyAttr_READONLY,               /**< READONLY= */
+  TidyAttr_REFERRERPOLICY,         /**< REFERRERPOLICY= */
   TidyAttr_REL,                    /**< REL= */
   TidyAttr_REV,                    /**< REV= */
   TidyAttr_RIGHTMARGIN,            /**< RIGHTMARGIN= */
diff --git a/src/attrdict.c b/src/attrdict.c
index e05a3052..fe2f1ff3 100644
--- a/src/attrdict.c
+++ b/src/attrdict.c
@@ -201,6 +201,7 @@ const AttrVersion TY_(W3CAttrsFor_A)[] =
   { TidyAttr_OnMOUSEOUT,            xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|xxxx|HT50|XH50 }, /* CORE override */
   { TidyAttr_OnMOUSEOVER,           xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|xxxx|HT50|XH50 }, /* CORE override */
   { TidyAttr_OnMOUSEUP,             xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|xxxx|HT50|XH50 }, /* CORE override */
+  { TidyAttr_REFERRERPOLICY,        xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|HT50|XH50 },
   { TidyAttr_REL,                   HT20|HT32|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|XB10|HT50|XH50 },
   { TidyAttr_REV,                   HT20|HT32|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|XB10|xxxx|xxxx },
   { TidyAttr_SDAPREF,               HT20|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx },
@@ -357,6 +358,7 @@ const AttrVersion TY_(W3CAttrsFor_AREA)[] =
   { TidyAttr_OnMOUSEOUT,            xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|xxxx|HT50|XH50 }, /* CORE override */
   { TidyAttr_OnMOUSEOVER,           xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|xxxx|HT50|XH50 }, /* CORE override */
   { TidyAttr_OnMOUSEUP,             xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|xxxx|HT50|XH50 }, /* CORE override */
+  { TidyAttr_REFERRERPOLICY,        xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|HT50|XH50 },
   { TidyAttr_REL,                   xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|HT50|XH50 },
   { TidyAttr_SHAPE,                 xxxx|HT32|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|xxxx|HT50|XH50 },
   { TidyAttr_STYLE,                 xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|xxxx|HT50|XH50 }, /* CORE override */
@@ -1636,6 +1638,7 @@ const AttrVersion TY_(W3CAttrsFor_IFRAME)[] =
   { TidyAttr_MARGINHEIGHT,          xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx },
   { TidyAttr_MARGINWIDTH,           xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx },
   { TidyAttr_NAME,                  xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|xxxx|xxxx|xxxx|xxxx|xxxx|HT50|XH50 },
+  { TidyAttr_REFERRERPOLICY,        xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|HT50|XH50 },
   { TidyAttr_SANDBOX,               xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|HT50|XH50 },
   { TidyAttr_SCROLLING,             xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx },
   { TidyAttr_SEAMLESS,              xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|HT50|XH50 },
@@ -1678,6 +1681,7 @@ const AttrVersion TY_(W3CAttrsFor_IMG)[] =
   { TidyAttr_OnMOUSEOUT,            xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|xxxx|HT50|XH50 }, /* CORE override */
   { TidyAttr_OnMOUSEOVER,           xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|xxxx|HT50|XH50 }, /* CORE override */
   { TidyAttr_OnMOUSEUP,             xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|xxxx|HT50|XH50 }, /* CORE override */
+  { TidyAttr_REFERRERPOLICY,        xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|HT50|XH50 },
   { TidyAttr_SDAPREF,               HT20|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx },
   { TidyAttr_SIZES,                 xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|HT50|XH50 },
   { TidyAttr_SRC,                   HT20|HT32|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|XB10|HT50|XH50 },
@@ -1978,6 +1982,7 @@ const AttrVersion TY_(W3CAttrsFor_LINK)[] =
   { TidyAttr_OnMOUSEOUT,            xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|xxxx|HT50|XH50 }, /* CORE override */
   { TidyAttr_OnMOUSEOVER,           xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|xxxx|HT50|XH50 }, /* CORE override */
   { TidyAttr_OnMOUSEUP,             xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|xxxx|HT50|XH50 }, /* CORE override */
+  { TidyAttr_REFERRERPOLICY,        xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|HT50|XH50 },
   { TidyAttr_REL,                   HT20|HT32|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|XB10|HT50|XH50 },
   { TidyAttr_REV,                   HT20|HT32|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|XB10|xxxx|xxxx },
   { TidyAttr_SDAPREF,               HT20|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx },
@@ -2794,6 +2799,7 @@ const AttrVersion TY_(W3CAttrsFor_SCRIPT)[] =
   { TidyAttr_ID,                    xxxx|xxxx|xxxx|xxxx|X10T|xxxx|xxxx|X10F|xxxx|xxxx|X10S|xxxx|xxxx|HT50|XH50 }, /* CORE override */
   { TidyAttr_INTEGRITY,             xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|HT50|XH50 },
   { TidyAttr_LANGUAGE,              xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx },
+  { TidyAttr_REFERRERPOLICY,        xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|HT50|XH50 },
   { TidyAttr_SRC,                   xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|xxxx|HT50|XH50 },
   { TidyAttr_TYPE,                  xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|xxxx|HT50|XH50 },
   { TidyAttr_XMLNS,                 xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|XH11|xxxx|HT50|XH50 }, /* CORE override */
diff --git a/src/attrs.c b/src/attrs.c
index 324e205c..dbdee4c1 100644
--- a/src/attrs.c
+++ b/src/attrs.c
@@ -54,6 +54,7 @@ static AttrCheck CheckRDFaTerm;
 static AttrCheck CheckRDFaPrefix;
 static AttrCheck CheckDecimal;
 static AttrCheck CheckSvgAttr;
+static AttrCheck CheckRefPol;
 
 #define CH_PCDATA      NULL
 #define CH_CHARSET     NULL
@@ -101,6 +102,7 @@ static AttrCheck CheckSvgAttr;
 #define CH_RDFATERMS   CheckRDFaTerm
 #define CH_DECIMAL     CheckDecimal
 #define CH_SVG         CheckSvgAttr
+#define CH_REFPOL      CheckRefPol
 
 /*
    WARNING: This table /must/ be kept in the EXACT order of the TidyAttrId enum!
@@ -233,6 +235,7 @@ static const Attribute attribute_defs [] =
   { TidyAttr_PROMPT,                  "prompt",                  CH_PCDATA    }, /* ISINDEX */
   { TidyAttr_RBSPAN,                  "rbspan",                  CH_NUMBER    }, /* ruby markup */
   { TidyAttr_READONLY,                "readonly",                CH_BOOL      }, /* form fields */
+  { TidyAttr_REFERRERPOLICY,          "referrerpolicy",          CH_REFPOL      }, /* form fields */
   { TidyAttr_REL,                     "rel",                     CH_LINKTYPES }, 
   { TidyAttr_REV,                     "rev",                     CH_LINKTYPES }, 
   { TidyAttr_RIGHTMARGIN,             "rightmargin",             CH_NUMBER    }, /* used on BODY */
@@ -2767,6 +2770,12 @@ void CheckRDFaSafeCURIE ( TidyDocImpl* doc, Node *node, AttVal *attval)
 
 }
 
+void CheckRefPol ( TidyDocImpl* doc, Node *node, AttVal *attval)
+{
+    ctmbstr const values[] = {"no-referrer", "no-referrer-when-downgrade", "same-origin", "origin", "strict-origin", "origin-when-cross-origin", "strict-origin-when-cross-origin", "unsafe-url", NULL};
+    CheckAttrValidity( doc, node, attval, values );
+}
+
 /*
  * local variables:
  * mode: c