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// The document open steps have:
//
// 2. If document's throw-on-dynamic-markup-insertion counter is greater than
// 0, then throw an "InvalidStateError" DOMException.
//
// The throw-on-dynamic-markup-insertion counter is only incremented when the
// parser creates a custom element, not when createElement is called. Test for
// this.
//
// See: https://html.spec.whatwg.org/multipage/dynamic-markup-insertion.html#document-open-steps
const noError = Symbol("no error");
let err = noError;
class CustomElement extends HTMLElement {
constructor() {
super();
try {
assert_equals(document.open(), document);
} catch (e) {
err = e;
}
}
}
customElements.define("custom-element", CustomElement);
test(t => {
err = noError;
document.createElement("custom-element");
assert_equals(err, noError);
}, "document.open() works in custom element constructor for createElement()");
test(t => {
err = noError;
document.write("<custom-element></custom-element>");
assert_throws_dom("InvalidStateError", () => {
throw err;
});
}, "document.open() is forbidden in custom element constructor when creating element from parser");
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