| Tests basic web-exposure of Custom Elements |
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| On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". |
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| Document.prototype.hasOwnProperty("registerElement") |
| false |
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| typeof Document.prototype.registerElement |
| undefined |
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| document.createElement("x-a") instanceof HTMLUnknownElement |
| false |
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| document.querySelector(":unresolved") |
| FAIL document.querySelector(":unresolved") threw exception SyntaxError: Failed to execute 'querySelector' on 'Document': ':unresolved' is not a valid selector. |
| undefined |
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| span.getAttribute("is") |
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| PASS window.customElements.define("a-a", A, {extends: "b"}) did not throw exception. |
| PASS successfullyParsed is true |
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| TEST COMPLETE |
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