LibWeb: Add Exposed attribute and IDL spec links where missing

The intent is to use these to autogenerate prototype declarations for
Window and WorkerGlobalScope classes.

And the spec links are just nice to have :^)

Userland/Libraries/LibWeb/DOM/CharacterData.idl

@@ -3,6 +3,7 @@
 #import <DOM/Node.idl>
 
 // https://dom.spec.whatwg.org/#characterdata
+[Exposed=Window]
 interface CharacterData : Node {
     [LegacyNullToEmptyString] attribute DOMString data;
     readonly attribute unsigned long length;

Userland/Libraries/LibWeb/DOM/Comment.idl

@@ -1,5 +1,7 @@
 #import <DOM/CharacterData.idl>
 
+// https://dom.spec.whatwg.org/#comment
+[Exposed=Window]
 interface Comment : CharacterData {
     constructor(optional DOMString data = "");
 };

Userland/Libraries/LibWeb/DOM/DOMImplementation.idl

@@ -1,5 +1,7 @@
 #import <DOM/Document.idl>
 
+// https://dom.spec.whatwg.org/#domimplementation
+[Exposed=Window]
 interface DOMImplementation {
 
     // FIXME: This should return XMLDocument instead of Document.

Userland/Libraries/LibWeb/DOM/DOMTokenList.idl

@@ -1,4 +1,5 @@
-[]
+// https://dom.spec.whatwg.org/#interface-domtokenlist
+[Exposed=Window]
 interface DOMTokenList {
     readonly attribute unsigned long length;
     getter DOMString? item(unsigned long index);

Userland/Libraries/LibWeb/DOM/Document.idl

@@ -20,6 +20,7 @@
 #import <HTML/HTMLScriptElement.idl>
 
 // https://dom.spec.whatwg.org/#document
+[Exposed=Window]
 interface Document : Node {
     constructor();
 

Userland/Libraries/LibWeb/DOM/DocumentFragment.idl

@@ -5,6 +5,7 @@
 #import <DOM/ParentNode.idl>
 
 // https://dom.spec.whatwg.org/#documentfragment
+[Exposed=Window]
 interface DocumentFragment : Node {
     constructor();
 

Userland/Libraries/LibWeb/DOM/DocumentType.idl

@@ -2,6 +2,7 @@
 #import <DOM/Node.idl>
 
 // https://dom.spec.whatwg.org/#documenttype
+[Exposed=Window]
 interface DocumentType : Node {
     readonly attribute DOMString name;
     readonly attribute DOMString publicId;

Userland/Libraries/LibWeb/DOM/Element.idl

@@ -21,6 +21,7 @@ dictionary ScrollIntoViewOptions : ScrollOptions {
 };
 
 // https://dom.spec.whatwg.org/#element
+[Exposed=Window]
 interface Element : Node {
     readonly attribute DOMString? namespaceURI;
     readonly attribute DOMString? prefix;

Userland/Libraries/LibWeb/DOM/Event.idl

@@ -1,6 +1,7 @@
 #import <DOM/EventTarget.idl>
 
-[]
+// https://dom.spec.whatwg.org/#event
+[Exposed=*]
 interface Event {
 
     constructor(DOMString type, optional EventInit eventInitDict = {});

Userland/Libraries/LibWeb/DOM/EventTarget.idl

@@ -1,5 +1,7 @@
 #import <DOM/AbortSignal.idl>
 
+// https://dom.spec.whatwg.org/#eventtarget
+[Exposed=*]
 interface EventTarget {
 
     undefined addEventListener(DOMString type, EventListener? callback, optional (AddEventListenerOptions or boolean) options = {});

Userland/Libraries/LibWeb/DOM/Node.idl

@@ -2,6 +2,8 @@
 #import <DOM/Element.idl>
 #import <DOM/EventTarget.idl>
 
+// https://dom.spec.whatwg.org/#node
+[Exposed=Window]
 interface Node : EventTarget {
 
     readonly attribute unsigned short nodeType;

Userland/Libraries/LibWeb/DOM/ProcessingInstruction.idl

@@ -1,5 +1,7 @@
 #import <DOM/CharacterData.idl>
 
+// https://dom.spec.whatwg.org/#processinginstruction
+[Exposed=Window]
 interface ProcessingInstruction : CharacterData {
     readonly attribute DOMString target;
 };

Userland/Libraries/LibWeb/DOM/ShadowRoot.idl

@@ -2,6 +2,7 @@
 #import <DOM/InnerHTML.idl>
 
 // https://dom.spec.whatwg.org/#shadowroot
+[Exposed=Window]
 interface ShadowRoot : DocumentFragment {
     // FIXME: mode should return a ShadowRootMode
     readonly attribute DOMString mode;

Userland/Libraries/LibWeb/DOM/Text.idl

@@ -1,5 +1,7 @@
 #import <DOM/CharacterData.idl>
 
+// https://dom.spec.whatwg.org/#text
+[Exposed=Window]
 interface Text : CharacterData {
     constructor(optional DOMString data = "");