LibWeb: Implement HTMLMarqueeElement.trueSpeed

Userland/Libraries/LibWeb/HTML/AttributeNames.h

@@ -250,6 +250,7 @@ namespace AttributeNames {
     __ENUMERATE_HTML_ATTRIBUTE(target)                     \
     __ENUMERATE_HTML_ATTRIBUTE(text)                       \
     __ENUMERATE_HTML_ATTRIBUTE(title)                      \
+    __ENUMERATE_HTML_ATTRIBUTE(truespeed)                  \
     __ENUMERATE_HTML_ATTRIBUTE(type)                       \
     __ENUMERATE_HTML_ATTRIBUTE(usemap)                     \
     __ENUMERATE_HTML_ATTRIBUTE(valign)                     \

Userland/Libraries/LibWeb/HTML/HTMLMarqueeElement.idl

@@ -14,7 +14,7 @@ interface HTMLMarqueeElement : HTMLElement {
     [FIXME, CEReactions] attribute long loop;
     [CEReactions] attribute unsigned long scrollAmount;
     [CEReactions] attribute unsigned long scrollDelay;
-    [FIXME, CEReactions] attribute boolean trueSpeed;
+    [CEReactions, Reflect=truespeed] attribute boolean trueSpeed;
     [CEReactions, Reflect] attribute unsigned long vspace;
     [CEReactions, Reflect] attribute DOMString width;