LibWeb: Add almost all obsolete but required IDL attributes

As according to https://html.spec.whatwg.org/multipage/obsolete.html
Section 16.3 "Requirements for implementations"

Not all of these attributes are included due to requiring a bit more
functionality.

Libraries/LibWeb/HTML/HTMLParagraphElement.idl

@@ -1,5 +1,5 @@
 interface HTMLParagraphElement : HTMLElement {
 
-
+    [Reflect] attribute DOMString align;
 
 }