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diff --git a/testing/web-platform/tests/html/webappapis/system-state-and-capabilities/the-navigator-object/content.html b/testing/web-platform/tests/html/webappapis/system-state-and-capabilities/the-navigator-object/content.html
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+<!DOCTYPE html>
+<meta charset='utf-8'>
+<title>registerContentHandler()</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>
+test(function () {
+  assert_idl_attribute(navigator, 'registerContentHandler');
+}, 'the registerContentHandler method should exist on the navigator object');
+
+/* Happy path */
+test(function () {
+  navigator.registerContentHandler('text/x-unknown-type', location.href + '/%s', 'foo');
+}, 'a handler with valid arguments should work');
+
+
+/* URL argument */
+test(function () {
+  navigator.registerContentHandler('text/x-unknown-type', '%s', 'foo');
+}, 'a relative URL should work');
+
+test(function () {
+  navigator.registerContentHandler('text/x-unknown-type', location.href + '#%s', 'foo');
+}, 'a URL with a fragment identifier should work');
+
+test(function () {
+  navigator.registerContentHandler('text/x-unknown-type', location.href + '?foo=%s', 'foo');
+}, 'a URL with a query string should work');
+
+test(function () {
+  navigator.registerContentHandler('text/x-unknown-type', location.href + '?foo=%s&bar', 'foo');
+}, 'a URL with a multi-argument query string should work');
+
+test(function () {
+  navigator.registerContentHandler('text/x-unknown-type', location.href + '/%s/bar/baz/', 'foo');
+}, 'a URL with the passed string as a directory name should work');
+
+test(function () {
+  navigator.registerContentHandler('text/x-unknown-type', 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.registerContentHandler('text/x-unknown-type', location.href + '/%s/foo/%s/', 'foo');
+}, 'a URL with the passed string included twice should work');
+
+test(function () {
+  assert_throws('SYNTAX_ERR', function () { navigator.registerContentHandler('text/x-unknown-type', '', 'foo') } );
+}, 'an empty url argument should throw SYNTAX_ERR');
+
+test(function () {
+  assert_throws('SYNTAX_ERR', function () { navigator.registerContentHandler('text/x-unknown-type', 'http://%s.com', 'foo') } );
+}, '%s instead of domain name should throw SYNTAX_ERR');
+
+test(function () {
+  assert_throws('SYNTAX_ERR', function () { navigator.registerContentHandler('text/x-unknown-type', 'http://%s.example.com', 'foo') } );
+}, '%s instead of subdomain name should throw syntax_err');
+
+test(function () {
+  assert_throws('SYNTAX_ERR', function () { navigator.registerContentHandler('text/x-unknown-type', location.href + '', 'foo') } );
+}, 'a url argument without %s should throw SYNTAX_ERR');
+
+test(function () {
+  assert_throws('SYNTAX_ERR', function () { navigator.registerContentHandler('text/x-unknown-type', '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.registerContentHandler('text/x-unknown-type', location.href + '/%', 'foo') } );
+}, 'a url argument without %s (but with %) should throw SYNTAX_ERR');
+
+test(function () {
+  assert_throws('SYNTAX_ERR', function () { navigator.registerContentHandler('text/x-unknown-type', location.href + '/%a', 'foo') } );
+}, 'a url argument without %s (but with %a) should throw SYNTAX_ERR');
+
+test(function () {
+  assert_throws('SECURITY_ERR', function () { navigator.registerContentHandler('text/x-unknown-type', '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.registerContentHandler('text/x-unknown-type', '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.registerContentHandler('text/x-unknown-type', 'http://foobar.example.com/%s', 'foo') } );
+}, 'a url argument pointing to a different domain name should throw SECURITY_ERR (3)');
+
+/* Content type argument */
+
+/* The following MIME types are handled natively by the browser, and must not
+ * be possible to override. Note that this list only covers a few basic content
+ * types. Full lists of content types handled by each browser is found under
+ * /vendor/. */
+
+var blacklist = new Array(
+  'image/jpeg',
+  'text/html',
+  'text/javascript',
+  'text/plain');
+
+for (var bi=0, bl=blacklist.length; bi<bl; ++bi){
+
+  test(function () {
+    assert_throws('SECURITY_ERR', function () { navigator.registerContentHandler(blacklist[bi], location.href + '/%s', 'foo') } );
+  }, 'attempting to override the ' + blacklist[bi] + ' MIME type should throw SECURITY_ERR');
+
+}
+
+/* Overriding the following MIME types should be possible. */
+var whitelist = new Array('application/atom+xml', /* For feeds. */
+  'application/rss+xml', /* For feeds. */
+  'application/x-unrecognized', /* Arbitrary MIME types should be overridable. */
+  'text/unrecognized',
+  'foo/bar');
+
+for (var wi=0, wl=whitelist.length; wi<wl; ++wi){
+
+  test(function () {
+    navigator.registerContentHandler(whitelist[wi], location.href + '/%s', 'foo');
+  }, 'overriding the ' + whitelist[wi] + ' MIME type should work');
+
+}
+
+</script>
+
+</body>
+</html>