| <!DOCTYPE html> |
| <title>HTMLUnknownElement</title> |
| <link rel="author" title="Ms2ger" href="mailto:ms2ger@gmail.com"> |
| <link rel="help" href="https://html.spec.whatwg.org/multipage/#htmlunknownelement"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <div id="log"></div> |
| <script> |
| test(function() { |
| var elt = document.createElement("xxx"); |
| assert_true(window.HTMLUnknownElement && elt instanceof HTMLUnknownElement, |
| "not an instance of HTMLUnknownElement"); |
| assert_true(window.HTMLSpanElement && !(elt instanceof HTMLSpanElement), |
| "an instance of HTMLSpanElement"); |
| }); |
| </script> |
