| Tests basic web-exposure of Custom Elements | |
| On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". | |
| Document.prototype.hasOwnProperty("registerElement") | |
| true | |
| typeof Document.prototype.registerElement | |
| function | |
| document.createElement("x-a") instanceof HTMLUnknownElement | |
| false | |
| document.querySelector(":unresolved") | |
| [object HTMLDivElement] | |
| span.getAttribute("is") | |
| type-extension | |
| PASS successfullyParsed is true | |
| TEST COMPLETE | |