LibWeb: Port the FormAssociatedElement value to UTF-16

This porting effort makes it pretty clear we will want a UTF-16-aware GenericLexer. But for now, we can actually make ASCII assumptions about what we are parsing, and act accordingly.
Author: https://github.com/trflynn89 Commit: c8888609f4 Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5610
2025-10-05 15:49:15 +00:00 · 2025-07-26 12:19:56 -04:00 · 2025-07-26 12:19:56 -04:00 · c8888609f4 · 2025-07-28 10:26:29 +00:00
commit c8888609f4
parent e7b08cf291
30 changed files with 444 additions and 333 deletions
--- a/Libraries/LibWeb/HTML/HTMLButtonElement.cpp
+++ b/Libraries/LibWeb/HTML/HTMLButtonElement.cpp
@ -117,10 +117,10 @@ bool HTMLButtonElement::is_submit_button() const
 }

 // https://html.spec.whatwg.org/multipage/form-elements.html#the-button-element:concept-fe-value
-String HTMLButtonElement::value() const
+Utf16String HTMLButtonElement::value() const
 {
    // The element's value is the value of the element's value attribute, if there is one; otherwise the empty string.
-    return attribute(AttributeNames::value).value_or(String {});
+    return Utf16String::from_utf8(attribute(AttributeNames::value).value_or(String {}));
 }

 // https://html.spec.whatwg.org/multipage/form-elements.html#the-button-element:concept-fe-optional-value