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")
false


typeof Document.prototype.registerElement
undefined


document.createElement("x-a") instanceof HTMLUnknownElement
false


document.querySelector(":unresolved")
FAIL document.querySelector(":unresolved") threw exception SyntaxError: Failed to execute 'querySelector' on 'Document': ':unresolved' is not a valid selector.
undefined


span.getAttribute("is")


PASS window.customElements.define("a-a", A, {extends: "b"}) did not throw exception.
PASS successfullyParsed is true

TEST COMPLETE