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Test that document.open() keeps an inherited base URL
document.open() called from another document rewrites the target document's URL, which does not change the base URL an about:blank or about:srcdoc document inherited when it was created.
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‎html/infrastructure/urls/base-url/document-base-url-document-open.html‎

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<!DOCTYPE html>
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<meta charset="utf-8">
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<title>document.open() does not change an about: document's inherited base URL</title>
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<link rel="help" href="https://html.spec.whatwg.org/multipage/urls-and-fetching.html#document-base-url">
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<link rel="help" href="https://html.spec.whatwg.org/multipage/dynamic-markup-insertion.html#dom-document-open">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<base href="/base-url-override/">
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<body>
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<script>
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// See https://github.com/whatwg/dom/issues/454
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const INHERITED_BASE_URL = new URL("/base-url-override/", location.href).href;
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// document.open() copies the calling document's URL, without its fragment.
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const REWRITTEN_URL = (() => {
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const url = new URL(location.href);
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url.hash = "";
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return url.href;
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})();
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function loadIframe(t, configure) {
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return new Promise(resolve => {
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const iframe = document.createElement("iframe");
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configure(iframe);
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iframe.addEventListener("load", () => resolve(iframe), { once: true });
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t.add_cleanup(() => iframe.remove());
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document.body.append(iframe);
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});
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}
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function documentOpenTest(configure) {
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return async t => {
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assert_equals(document.baseURI, INHERITED_BASE_URL, "this document's base URL");
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assert_not_equals(document.baseURI, REWRITTEN_URL,
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"this document's base URL has to differ from its URL");
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const doc = (await loadIframe(t, configure)).contentDocument;
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assert_equals(doc.baseURI, INHERITED_BASE_URL, "inherited base URL");
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doc.open();
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assert_equals(doc.URL, REWRITTEN_URL, "URL after document.open()");
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assert_equals(doc.baseURI, INHERITED_BASE_URL, "base URL after document.open()");
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doc.close();
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};
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}
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promise_test(documentOpenTest(() => {}),
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"document.open() on an initial about:blank document");
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promise_test(documentOpenTest(iframe => iframe.src = "about:blank"),
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"document.open() on an about:blank document");
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promise_test(documentOpenTest(iframe => iframe.srcdoc = "x"),
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"document.open() on an about:srcdoc document");
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</script>

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