HTML: initial about:blank navigation

[annevk]

This fails in Chrome and Safari, against the HTML Standard.

See also whatwg/html#3267. This bit me today.

[domenic]

Looks correct according to the current spec, although if we could simplify this by removing the 1-window-2-document case, that'd be ideal. I'll discuss on the issue tracker.

[annevk]

I guess I'll leave this open for now as it's not yet clear who should align with what. I also wonder if there's a difference when src is already set upon insertion.

And another thing that needs to be sorted out is when the load event is dispatched as that also differs across browsers for some cases.

[domenic]

I think @zetafunction ended up landing a counterpart to this in

wpt/html/browsers/the-window-object/window-reuse-in-nested-browsing-contexts.tentative.html

Lines 17 to 34 in b9feb6c

	promise_test(async t => {
	const {iframe, watcher} = setupIframe(t, {});
	// Per https://whatwg.org/c/iframe-embed-object.html#process-the-iframe-attributes,
	// the task to perform the "iframe load event steps" should still be queued.
	// If a browser already fired a load event, the test will fail here since
	// EventWatcher will have received an unexpected load event.
	iframe.contentWindow.persistedString = 'Hello world!';
	iframe.src = 'support/same-origin-iframe.html';
	await watcher.wait_for(['load']);
	assert_true(iframe.contentWindow.didLoadFrame);
	// The <iframe>'s session history has only one Document, and that Document is
	// the initial:blank Document. The Window object should be reused per
	// https://whatwg.org/c/iframe-embed-object.html#process-the-iframe-attributes.
	assert_equals(iframe.contentWindow.persistedString, 'Hello world!');
	}, 'synchronously navigate iframe with no initial src.');

so I'll close this. Please reopen if I misunderstood.

[annevk]

Thanks, that does look equivalent if not identical to me.