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diff --git a/testing/web-platform/tests/html/webappapis/system-state-and-capabilities/the-navigator-object/protocol.html b/testing/web-platform/tests/html/webappapis/system-state-and-capabilities/the-navigator-object/protocol.html
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+++ b/testing/web-platform/tests/html/webappapis/system-state-and-capabilities/the-navigator-object/protocol.html
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+<!DOCTYPE html>
+<meta charset='utf-8'>
+<title>registerProtocolHandler()</title>
+
+<script src='/resources/testharness.js'></script>
+<script src='/resources/testharnessreport.js'></script>
+
+<noscript><p>Enable JavaScript and reload.</p></noscript>
+
+<p><strong>Note:</strong> If your browser limits the number of handler
+registration requests on a page, you might need to disable or significantly
+increase that limit for the tests below to run.</p>
+
+<div id='log'></div>
+
+<script type='text/javascript'>
+
+test(function () {
+  assert_idl_attribute(navigator, 'registerProtocolHandler');
+}, 'the registerProtocolHandler method should exist on the navigator object');
+
+test(function () {
+  navigator.registerProtocolHandler('tel', location.href + '/%s', 'foo');
+}, 'a handler with valid arguments should work');
+
+
+/* URL argument */
+test(function () {
+  navigator.registerProtocolHandler('tel', '%s', 'foo');
+}, 'a relative URL should work');
+
+test(function () {
+  navigator.registerProtocolHandler('tel', location.href + '#%s', 'foo');
+}, 'a URL with a fragment identifier should work');
+
+test(function () {
+  navigator.registerProtocolHandler('tel', location.href + '?foo=%s', 'foo');
+}, 'a URL with a query string should work');
+
+test(function () {
+  navigator.registerProtocolHandler('tel', location.href + '?foo=%s&bar', 'foo');
+}, 'a URL with a multi-argument query string should work');
+
+test(function () {
+  navigator.registerProtocolHandler('tel', location.href + '/%s/bar/baz/', 'foo');
+}, 'a URL with the passed string as a directory name should work');
+
+test(function () {
+  navigator.registerProtocolHandler('tel', location.href + '/%s/bar/baz/?foo=1337&bar#baz', 'foo');
+}, 'a URL with the passed string as a directory name followed by a query string and fragment identifier should work');
+
+test(function () {
+  navigator.registerProtocolHandler('tel', location.href + '/%s/foo/%s/', 'foo');
+}, 'a URL with the passed string included twice should work');
+
+test(function () {
+  assert_throws('SYNTAX_ERR', function () { navigator.registerProtocolHandler('mailto', '', 'foo') } );
+}, 'an empty url argument should throw SYNTAX_ERR');
+
+test(function () {
+  assert_throws('SYNTAX_ERR', function () { navigator.registerProtocolHandler('mailto', 'http://%s.com', 'foo') } );
+}, '%s instead of domain name should throw SYNTAX_ERR');
+
+test(function () {
+  assert_throws('SYNTAX_ERR', function () { navigator.registerProtocolHandler('mailto', 'http://%s.example.com', 'foo') } );
+}, '%s instead of subdomain name should throw SYNTAX_ERR');
+
+test(function () {
+  assert_throws('SYNTAX_ERR', function () { navigator.registerProtocolHandler('mailto', location.href + '', 'foo') } );
+}, 'a url argument without %s should throw SYNTAX_ERR');
+
+test(function () {
+  assert_throws('SYNTAX_ERR', function () { navigator.registerProtocolHandler('mailto', 'http://example.com', 'foo') } );
+}, 'a url argument pointing to a different domain name, without %s should throw SYNTAX_ERR');
+
+test(function () {
+  assert_throws('SYNTAX_ERR', function () { navigator.registerProtocolHandler('mailto', location.href + '/%', 'foo') } );
+}, 'a url argument without %s (but with %) should throw SYNTAX_ERR');
+
+test(function () {
+  assert_throws('SYNTAX_ERR', function () { navigator.registerProtocolHandler('mailto', location.href + '/%a', 'foo') } );
+}, 'a url argument without %s (but with %a) should throw SYNTAX_ERR');
+
+test(function () {
+  assert_throws('SECURITY_ERR', function () { navigator.registerProtocolHandler('mailto', 'http://example.com/%s', 'foo') } );
+}, 'a url argument pointing to a different domain name should throw SECURITY_ERR');
+
+test(function () {
+  assert_throws('SECURITY_ERR', function () { navigator.registerProtocolHandler('mailto', 'https://example.com/%s', 'foo') } );
+}, 'a url argument pointing to a different domain name should throw SECURITY_ERR (2)');
+
+test(function () {
+  assert_throws('SECURITY_ERR', function () { navigator.registerProtocolHandler('mailto', 'http://foobar.example.com/%s', 'foo') } );
+}, 'a url argument pointing to a different domain name should throw SECURITY_ERR (3)');
+
+test(function () {
+  assert_throws('SECURITY_ERR', function () { navigator.registerProtocolHandler('mailto', 'mailto:%s@example.com', 'foo') } );
+}, 'looping handlers should throw SECURITY_ERR');
+
+test(function () {
+  assert_throws('SECURITY_ERR', function () { navigator.registerProtocolHandler('sms', 'tel:%s', 'foo') } );
+}, 'a url argument pointing to a non-http[s] scheme should throw SECURITY_ERR due to not being of the same origin');
+
+/* Protocol argument */
+test(function () {
+  assert_throws('SYNTAX_ERR', function () { navigator.registerProtocolHandler('unrecognized', location.href + '/%a', 'foo') } );
+}, 'a protocol argument containing an unrecognized scheme should throw SECURITY_ERR'); /* This is a whitelist, not a blacklist. */
+
+test(function () {
+  assert_throws('SYNTAX_ERR', function () { navigator.registerProtocolHandler('mailto:', location.href + '/%a', 'foo') } );
+}, 'a protocol argument containing : should throw SYNTAX_ERR');
+
+test(function () {
+  assert_throws('SYNTAX_ERR', function () { navigator.registerProtocolHandler('mailto://', location.href + '/%a', 'foo') } );
+}, 'a protocol argument containing :// should throw SYNTAX_ERR');
+
+test(function () {
+  assert_throws('SYNTAX_ERR', function () { navigator.registerProtocolHandler('http://', location.href + '/%a', 'foo') } );
+}, 'a protocol argument containing http:// should throw SYNTAX_ERR');
+
+test(function () {
+  assert_throws('SYNTAX_ERR', function () { navigator.registerProtocolHandler('mailto' + String.fromCharCode(0), location.href + '/%a', 'foo') } );
+}, 'a protocol argument containing a null character should throw SYNTAX_ERR');
+
+test(function () {
+  assert_throws('SYNTAX_ERR', function () { navigator.registerProtocolHandler('mailtoo' + String.fromCharCode(8), location.href + '/%a', 'foo') } );
+}, 'a protocol argument containing a backspace character should throw SYNTAX_ERR');
+
+test(function () {
+  assert_throws('SYNTAX_ERR', function () { navigator.registerProtocolHandler('mailto' + String.fromCharCode(10), location.href + '/%a', 'foo') } );
+}, 'a protocol argument containing a LF character should throw SYNTAX_ERR');
+
+test(function () {
+  assert_throws('SYNTAX_ERR', function () { navigator.registerProtocolHandler('mаilto', location.href + '/%a', 'foo') } );
+}, 'a protocol argument containing non-alphanumeric characters (like a cyrillic “а”) should throw SYNTAX_ERR');
+
+test(function () {
+  navigator.registerProtocolHandler('TEL', location.href + '/%s', 'foo');
+}, 'a protocol argument of “TEL” should be equivalent to “tel”');
+
+test(function () {
+  navigator.registerProtocolHandler('teL', location.href + '/%s', 'foo');
+}, 'a protocol argument of “teL” should be equivalent to “tel”');
+
+
+/* Overriding any of the following protocols must never be allowed. That would
+ * break the browser. */
+var blacklist = new Array(
+  'about',
+  'attachment',
+  'blob',
+  'chrome',
+  'cid',
+  'data',
+  'file',
+  'ftp',
+  'http',
+  'https',
+  'javascript',
+  'livescript',
+  'mid',
+  'mocha',
+  'opera',
+  'operamail',
+  'res',
+  'resource',
+  'shttp',
+  'tcl',
+  'vbscript',
+  'view-source',
+  'ws',
+  'wss',
+  'wyciwyg');
+
+for ( var bi=0, bl=blacklist.length; bi<bl; ++bi ){
+
+  test(function () {
+    assert_throws('SECURITY_ERR', function () { navigator.registerProtocolHandler(blacklist[bi], location.href + '/%s', 'foo') } );
+  }, 'attempting to override the ' + blacklist[bi] + ' protocol should throw SECURITY_ERR');
+
+}
+
+/* The following protocols must be possible to override.
+ * We're just testing that the call goes through here. Whether or not they
+ * actually work as handlers is covered by the interactive tests. */
+var whitelist = new Array(
+  'geo',
+  'im',
+  'irc',
+  'ircs',
+  'mailto',
+  'mms',
+  'news',
+  'nntp',
+  'sms',
+  'smsto',
+  'tel',
+  'urn',
+  'webcal',
+  'wtai',
+  'xmpp');
+
+for ( var wi=0, wl=whitelist.length; wi<wl; ++wi ){
+
+  test(function () {
+    navigator.registerProtocolHandler(whitelist[wi], location.href + '/%s', 'foo');
+    assert_true(true);
+  }, 'overriding the ' + whitelist[wi] + ' protocol should work');
+
+}
+</script>
+
+</body>
+</html>