diff --git a/src/imp/element_handle.rs b/src/imp/element_handle.rs
index 02ca78a..9c884a8 100644
--- a/src/imp/element_handle.rs
+++ b/src/imp/element_handle.rs
@@ -433,6 +433,7 @@ pub(crate) struct SelectOptionArgs {
 }
 
 #[derive(Serialize)]
+#[serde(rename_all = "camelCase")]
 pub(crate) enum Opt {
     Value(String),
     Index(usize),
diff --git a/src/imp/frame.rs b/src/imp/frame.rs
index 962340f..29c2654 100644
--- a/src/imp/frame.rs
+++ b/src/imp/frame.rs
@@ -688,7 +688,8 @@ pub enum FrameState {
 
 macro_rules! type_args {
     ($t:ident, $f:ident) => {
-        #[derive(Serialize)]
+        #[skip_serializing_none]
+        #[derive(Serialize, Default)]
         #[serde(rename_all = "camelCase")]
         pub(crate) struct $t<'a, 'b> {
             selector: &'a str,