diff --git a/html/dom/elements-embedded.js b/html/dom/elements-embedded.js
index a948b62ff83bda..4966abdcf8ed58 100644
--- a/html/dom/elements-embedded.js
+++ b/html/dom/elements-embedded.js
@@ -141,7 +141,7 @@ var embeddedElements = {
     hreflang: "string",
     type: "string",
 
-          //URLUtils
+    // HTMLHyperlinkElementUtils
     href: "url",
 
     // Obsolete
diff --git a/html/dom/elements-text.js b/html/dom/elements-text.js
index bcfcb8f00ffe73..96c1d923702601 100644
--- a/html/dom/elements-text.js
+++ b/html/dom/elements-text.js
@@ -10,7 +10,7 @@ var textElements = {
     hreflang: "string",
     type: "string",
 
-    // URLUtils
+    // HTMLHyperlinkElementUtils
     href: "url",
 
     // Obsolete
diff --git a/html/dom/interfaces.html b/html/dom/interfaces.html
index cc5945f246119e..69d81ccb0eba31 100644
--- a/html/dom/interfaces.html
+++ b/html/dom/interfaces.html
@@ -11,16 +11,6 @@
 <h1>HTML IDL tests</h1>
 <div id=log></div>
 
-<!-- URLUtils* stubs -->
-<script type=text/plain class=untested>
-interface URLUtils {
-  stringifier;
-};
-interface URLUtilsReadOnly {
-  stringifier;
-};
-</script>
-<!-- DOM IDLs -->
 <script type=text/plain class=untested>
 [Constructor(DOMString type, optional EventInit eventInitDict)/*,
  Exposed=(Window,Worker)*/]
@@ -868,6 +858,21 @@ <h1>HTML IDL tests</h1>
          Float32Array or Float64Array or
          DataView) ArrayBufferView;
 
+[NoInterfaceObject, Exposed=Window]
+interface HTMLHyperlinkElementUtils {
+  stringifier attribute USVString href;
+           attribute USVString origin;
+           attribute USVString protocol;
+           attribute USVString username;
+           attribute USVString password;
+           attribute USVString host;
+           attribute USVString hostname;
+           attribute USVString port;
+           attribute USVString pathname;
+           attribute USVString search;
+           attribute USVString hash;
+};
+
 interface HTMLAllCollection : HTMLCollection {
   // inherits length and 'getter'
   Element? item(unsigned long index);
@@ -1125,19 +1130,17 @@ <h1>HTML IDL tests</h1>
 };
 
 interface HTMLAnchorElement : HTMLElement {
-           attribute DOMString target;
-           attribute DOMString download;
-  [PutForwards=value] attribute DOMSettableTokenList ping;
-           attribute DOMString rel;
+  attribute DOMString target;
+  attribute DOMString download;
+  [PutForwards=value] readonly attribute DOMSettableTokenList ping;
+  attribute DOMString rel;
   readonly attribute DOMTokenList relList;
-           attribute DOMString hreflang;
-           attribute DOMString type;
-
-           attribute DOMString text;
+  attribute DOMString hreflang;
+  attribute DOMString type;
 
-  // also has obsolete members
+  attribute DOMString text;
 };
-HTMLAnchorElement implements URLUtils;
+HTMLAnchorElement implements HTMLHyperlinkElementUtils;
 
 interface HTMLDataElement : HTMLElement {
            attribute DOMString value;
@@ -1494,20 +1497,17 @@ <h1>HTML IDL tests</h1>
 };
 
 interface HTMLAreaElement : HTMLElement {
-           attribute DOMString alt;
-           attribute DOMString coords;
-           attribute DOMString shape;
-           attribute DOMString target;
-           attribute DOMString download;
-  [PutForwards=value] attribute DOMSettableTokenList ping;
-           attribute DOMString rel;
+  attribute DOMString alt;
+  attribute DOMString coords;
+  attribute DOMString shape;
+  attribute DOMString target;
+  attribute DOMString download;
+  [PutForwards=value] readonly attribute DOMSettableTokenList ping;
+  attribute DOMString rel;
   readonly attribute DOMTokenList relList;
-           attribute DOMString hreflang;
-           attribute DOMString type;
-
-  // also has obsolete members
+  // hreflang and type are not reflected
 };
-HTMLAreaElement implements URLUtils;
+HTMLAreaElement implements HTMLHyperlinkElementUtils;
 
 interface HTMLTableElement : HTMLElement {
            attribute HTMLTableCaptionElement? caption;
@@ -2320,11 +2320,22 @@ <h1>HTML IDL tests</h1>
 };
 
 [Unforgeable] interface Location {
-  void assign(DOMString url);
-  void replace(DOMString url);
+  stringifier attribute USVString href;
+           attribute USVString origin;
+           attribute USVString protocol;
+           attribute USVString host;
+           attribute USVString hostname;
+           attribute USVString port;
+           attribute USVString pathname;
+           attribute USVString search;
+           attribute USVString hash;
+
+  void assign(USVString url);
+  void replace(USVString url);
   void reload();
+
+  [SameObject] readonly attribute USVString[] ancestorOrigins;
 };
-Location implements URLUtils;
 
 [Constructor(DOMString type, optional PopStateEventInit eventInitDict), Exposed=Window,Worker]
 interface PopStateEvent : Event {
@@ -2816,8 +2827,17 @@ <h1>HTML IDL tests</h1>
 WorkerNavigator implements NavigatorOnLine;
 
 [Exposed=Worker]
-interface WorkerLocation { };
-WorkerLocation implements URLUtilsReadOnly;
+interface WorkerLocation {
+  stringifier readonly attribute USVString href;
+  readonly attribute USVString origin;
+  readonly attribute USVString protocol;
+  readonly attribute USVString host;
+  readonly attribute USVString hostname;
+  readonly attribute USVString port;
+  readonly attribute USVString pathname;
+  readonly attribute USVString search;
+  readonly attribute USVString hash;
+};
 
 interface Storage {
   readonly attribute unsigned long length;
diff --git a/url/interfaces.html b/url/interfaces.html
index 4cae46732be1a9..254242fb8847a5 100644
--- a/url/interfaces.html
+++ b/url/interfaces.html
@@ -9,54 +9,38 @@ <h1>URL IDL tests</h1>
 <div id=log></div>
 
 <script type=text/plain>
-[Constructor(DOMString url, optional DOMString base = "about:blank"),
- Exposed=Window,Worker]
+[Constructor(USVString url, optional USVString base),
+ Exposed=(Window,Worker)]
 interface URL {
-  static DOMString domainToASCII(ScalarValueString domain);
-  static DOMString domainToUnicode(ScalarValueString domain);
-};
-URL implements URLUtils;
-
-[NoInterfaceObject]
-interface URLUtils {
-  stringifier attribute ScalarValueString href;
-  readonly attribute DOMString origin;
+  static USVString domainToASCII(USVString domain);
+  static USVString domainToUnicode(USVString domain);
 
-           attribute ScalarValueString protocol;
-           attribute ScalarValueString username;
-           attribute ScalarValueString password;
-           attribute ScalarValueString host;
-           attribute ScalarValueString hostname;
-           attribute ScalarValueString port;
-           attribute ScalarValueString pathname;
-           attribute ScalarValueString search;
-           readonly attribute URLSearchParams searchParams;
-           attribute ScalarValueString hash;
+  stringifier attribute USVString href;
+  readonly attribute USVString origin;
+           attribute USVString protocol;
+           attribute USVString username;
+           attribute USVString password;
+           attribute USVString host;
+           attribute USVString hostname;
+           attribute USVString port;
+           attribute USVString pathname;
+           attribute USVString search;
+  readonly attribute URLSearchParams searchParams;
+           attribute USVString hash;
 };
 
-[NoInterfaceObject]
-interface URLUtilsReadOnly {
-  stringifier readonly attribute DOMString href;
-  readonly attribute DOMString origin;
-
-  readonly attribute DOMString protocol;
-  readonly attribute DOMString host;
-  readonly attribute DOMString hostname;
-  readonly attribute DOMString port;
-  readonly attribute DOMString pathname;
-  readonly attribute DOMString search;
-  readonly attribute DOMString hash;
-};
+[Constructor(optional (USVString or URLSearchParams) init = ""),
+ Exposed=(Window,Worker)]
 interface URLSearchParams {
-  void append(ScalarValueString name, ScalarValueString value);
-  void delete(ScalarValueString name);
-  DOMString? get(ScalarValueString name);
-  sequence<DOMString> getAll(ScalarValueString name);
-  boolean has(ScalarValueString name);
-  void set(ScalarValueString name, ScalarValueString value);
+  void append(USVString name, USVString value);
+  void delete(USVString name);
+  USVString? get(USVString name);
+  sequence<USVString> getAll(USVString name);
+  boolean has(USVString name);
+  void set(USVString name, USVString value);
+  iterable<USVString, USVString>;
   stringifier;
 };
-typedef DOMString ScalarValueString;
 </script>
 <script>
 "use strict";