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diff --git a/dom/tests/mochitest/webcomponents/test_document_register.html b/dom/tests/mochitest/webcomponents/test_document_register.html
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+++ b/dom/tests/mochitest/webcomponents/test_document_register.html
@@ -0,0 +1,163 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=783129
+-->
+<head>
+  <title>Test for document.registerElement using custom prototype</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=783129">Bug 783129</a>
+<div>
+<x-unresolved id="unresolved"></x-unresolved>
+</div>
+
+<script>
+
+function testRegisterExtend(tag, extend, proto, expectException) {
+  try {
+    document.registerElement(tag, { prototype: proto, extends: extend });
+    ok(!expectException, "Registered " + tag + " extending " + extend + " containing " + proto + " in proto chain.");
+  } catch (ex) {
+    ok(expectException, "Did not register " + tag + " extending " + extend + " containing " + proto + " in proto chain.");
+  }
+}
+
+function testRegisterSimple(tag, proto, expectException) {
+  try {
+    document.registerElement(tag, { prototype: proto });
+    ok(!expectException, "Registered " + tag + " containing " + proto + " in proto chain.");
+  } catch (ex) {
+    ok(expectException, "Did not register " + tag + " containing " + proto + " in proto chain.");
+  }
+}
+
+function startTest() {
+  // Test registering some simple prototypes.
+  testRegisterSimple("x-html-obj-elem", Object.create(HTMLElement.prototype), false);
+  testRegisterSimple("x-html-obj-p", Object.create(HTMLParagraphElement.prototype), false);
+
+  // If prototype is an interface prototype object for any interface object,
+  // registration will throw.
+  testRegisterSimple("x-html-elem", HTMLElement.prototype, true);
+  testRegisterSimple("x-html-select", HTMLSelectElement.prototype, true);
+  testRegisterSimple("some-elem", HTMLElement.prototype, true);
+  testRegisterSimple("x-html-p", HTMLParagraphElement.prototype, true);
+  testRegisterSimple("x-html-span", HTMLSpanElement.prototype, true);
+
+  // Make sure the prototype on unresolved elements is HTMLElement not HTMLUnknownElement.
+  var unresolved = document.getElementById("unresolved");
+  is(unresolved.__proto__, HTMLElement.prototype, "Unresolved custom elements should have HTMLElement as prototype.");
+
+  var anotherUnresolved = document.createElement("maybe-custom-element");
+  is(anotherUnresolved.__proto__, HTMLElement.prototype, "Unresolved custom elements should have HTMLElement as prototype.");
+
+  // Registering without a prototype should automatically create one inheriting from HTMLElement.
+  testRegisterSimple("x-elem-no-proto", null, false);
+
+  var simpleProto = Object.create(HTMLElement.prototype);
+  testRegisterSimple("x-elem-simple-proto", simpleProto, false);
+
+  // Test registering some invalid prototypes.
+  testRegisterSimple("x-invalid-number", 42, true);
+  testRegisterSimple("x-invalid-boolean", false, true);
+  testRegisterSimple("x-invalid-float", 1.0, true);
+  // A prototype with a non-configurable "constructor" property must throw.
+  var nonConfigProto = Object.create(HTMLElement.prototype,
+    { constructor: { configurable: false, value: function() {} } });
+  testRegisterSimple("x-non-config-proto", nonConfigProto, true);
+
+  // Test invalid custom element names.
+  testRegisterSimple("invalid", Object.create(HTMLElement.prototype), true);
+  testRegisterSimple("annotation-xml", Object.create(HTMLElement.prototype), true);
+  testRegisterSimple("color-profile", Object.create(HTMLElement.prototype), true);
+  testRegisterSimple("font-face", Object.create(HTMLElement.prototype), true);
+  testRegisterSimple("font-face-src", Object.create(HTMLElement.prototype), true);
+  testRegisterSimple("font-face-uri", Object.create(HTMLElement.prototype), true);
+  testRegisterSimple("font-face-format", Object.create(HTMLElement.prototype), true);
+  testRegisterSimple("font-face-name", Object.create(HTMLElement.prototype), true);
+  testRegisterSimple("missing-glyph", Object.create(HTMLElement.prototype), true);
+
+  // Test registering elements that extend from an existing element.
+  testRegisterExtend("x-extend-span", "span", Object.create(HTMLElement.prototype), false);
+  testRegisterExtend("x-extend-span-caps", "SPAN", Object.create(HTMLElement.prototype), false);
+
+  // Test registering elements that extend from a non-existing element.
+  testRegisterExtend("x-extend-span-nonexist", "nonexisting", Object.create(HTMLElement.prototype), true);
+
+  // Test registration with duplicate type.
+  testRegisterSimple("x-dupe-me", Object.create(HTMLElement.prototype), false);
+  testRegisterSimple("x-dupe-me", Object.create(HTMLElement.prototype), true);
+  testRegisterSimple("X-DUPE-ME", Object.create(HTMLElement.prototype), true);
+  testRegisterSimple("x-dupe-me", null, true);
+  testRegisterExtend("x-dupe-me", "span", Object.create(HTMLElement.prototype), true);
+
+  // document.createElement with extended type.
+  var extendedProto = Object.create(HTMLButtonElement.prototype);
+  var buttonConstructor = document.registerElement("x-extended-button", { prototype: extendedProto, extends: "button" });
+  var extendedButton = document.createElement("button", {is: "x-extended-button"});
+  is(extendedButton.tagName, "BUTTON", "Created element should have local name of BUTTON");
+  is(extendedButton.__proto__, extendedProto, "Created element should have the prototype of the extended type.");
+  is(extendedButton.getAttribute("is"), "x-extended-button", "The |is| attribute of the created element should be the extended type.");
+  is(extendedButton.type, "submit", "Created element should be a button with type of \"submit\"");
+
+  // document.createElementNS with different namespace than definition.
+  try {
+    var svgButton = document.createElementNS("http://www.w3.org/2000/svg", "button", {is: "x-extended-button"});
+    ok(false, "An exception should've been thrown");
+  } catch(err) {
+    is(err.name, "NotFoundError", "A NotFoundError exception should've been thrown");
+  }
+
+  // document.createElementNS with no namespace.
+  try {
+    var noNamespaceButton = document.createElementNS("", "button", {is: "x-extended-button"});
+    ok(false, "An exception should've been thrown");
+  } catch(err) {
+    is(err.name, "NotFoundError", "A NotFoundError exception should've been thrown");
+  }
+
+  // document.createElement with non-existant extended type.
+  try {
+    var normalButton = document.createElement("button", {is: "x-non-existant"});
+    ok(false, "An exception should've been thrown");
+  } catch(err) {
+    is(err.name, "NotFoundError", "A NotFoundError exception should've been thrown");
+  }
+
+  // document.createElement with exteneded type that does not match with local name of element.
+  try {
+    var normalDiv = document.createElement("div", {is: "x-extended-button"});
+    ok(false, "An exception should've been thrown");
+  } catch(err) {
+    is(err.name, "NotFoundError", "A NotFoundError exception should've been thrown");
+  }
+
+  // Custom element constructor.
+  var constructedButton = new buttonConstructor();
+  is(constructedButton.tagName, "BUTTON", "Created element should have local name of BUTTON");
+  is(constructedButton.__proto__, extendedProto, "Created element should have the prototype of the extended type.");
+  is(constructedButton.getAttribute("is"), "x-extended-button", "The |is| attribute of the created element should be the extended type.");
+
+  // document.createElement with different namespace than definition for extended element.
+  try {
+    var htmlText = document.createElement("text", {is: "x-extended-text"});
+    ok(false, "An exception should've been thrown");
+  } catch(err) {
+    is(err.name, "NotFoundError", "A NotFoundError exception should've been thrown");
+  }
+
+  // Try creating an element with a custom element name, but not in the html namespace.
+  var htmlNamespaceProto = Object.create(HTMLElement.prototype);
+  document.registerElement("x-in-html-namespace", { prototype: htmlNamespaceProto });
+  var wrongNamespaceElem = document.createElementNS("http://www.w3.org/2000/svg", "x-in-html-namespace");
+  isnot(wrongNamespaceElem.__proto__, htmlNamespaceProto, "Definition for element in html namespace should not apply to SVG elements.");
+}
+
+startTest();
+
+</script>
+</body>
+</html>