LibWeb: Implement the autocapitalize attribute

Author: https://github.com/Calme1709
Commit: a6fb7c84e9
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4907
Reviewed-by: https://github.com/Lubrsi ✅
Reviewed-by: https://github.com/ananas-dev

Libraries/LibWeb/HTML/HTMLElement.h

@@ -123,6 +123,18 @@ public:
     String writing_suggestions() const;
     void set_writing_suggestions(String const&);
 
+    enum class AutocapitalizationHint {
+        Default,
+        None,
+        Sentences,
+        Words,
+        Characters
+    };
+
+    AutocapitalizationHint own_autocapitalization_hint() const;
+    String autocapitalize() const;
+    void set_autocapitalize(String const&);
+
     bool fire_a_synthetic_pointer_event(FlyString const& type, DOM::Element& target, bool not_trusted);
 
     // https://html.spec.whatwg.org/multipage/forms.html#category-label