| This is a testharness.js-based test. |
| PASS Check the existence of Element.attachShadow |
| PASS Nodes other than Element should not have attachShadow |
| PASS Element.attachShadow must throw a TypeError if mode is not "open" or "closed" |
| PASS Element.attachShadow must create an instance of ShadowRoot |
| PASS Element.attachShadow must throw a InvalidStateError if the context object already hosts a shadow tree |
| FAIL Element.attachShadow must throw a NotSupportedError for button, details, input, marquee, meter, progress, select, textarea, and keygen elements assert_throws: Calling attachShadow({mode: "open"}) on button element must throw function "function () { |
| document.createElement(elementN..." did not throw |
| Harness: the test ran to completion. |
| |
