LibWeb: Use is_ascii_case_insensitive_match() where the spec says to

Author: https://github.com/AtkinsSJ
Commit: 2026ea557e
Pull-request: https://github.com/SerenityOS/serenity/pull/17502
Reviewed-by: https://github.com/linusg
Reviewed-by: https://github.com/trflynn89

Userland/Libraries/LibWeb/HTML/HTMLStyleElement.cpp

@@ -8,6 +8,7 @@
 #include <LibWeb/CSS/Parser/Parser.h>
 #include <LibWeb/DOM/Document.h>
 #include <LibWeb/HTML/HTMLStyleElement.h>
+#include <LibWeb/Infra/Strings.h>
 
 namespace Web::HTML {
 
@@ -131,7 +132,7 @@ void HTMLStyleElement::update_a_style_block()
 
     // 4. If element's type attribute is present and its value is neither the empty string nor an ASCII case-insensitive match for "text/css", then return.
     auto type_attribute = attribute(HTML::AttributeNames::type);
-    if (!type_attribute.is_null() && !type_attribute.is_empty() && !type_attribute.equals_ignoring_case("text/css"sv))
+    if (!type_attribute.is_null() && !type_attribute.is_empty() && !Infra::is_ascii_case_insensitive_match(type_attribute, "text/css"sv))
         return;
 
     // FIXME: 5. If the Should element's inline behavior be blocked by Content Security Policy? algorithm returns "Blocked" when executed upon the style element, "style", and the style element's child text content, then return. [CSP]