Hello! I have been trying to debug an issue in Ladybird's implementation of https://github.com/web-platform-tests/wpt/blob/master/url/data-uri-fragment.html

The issue in Ladybirds implementation is that the script is running .matches(':target') before the document has populated it's target element. I know of a way to 'fix' it, but I'm having trouble figuring out how the spec intends this to be done. From what I can gather, the entry point of this is maybe somewhere around here: https://html.spec.whatwg.org/multipage/browsing-the-web.html#scripts-may-run-for-the-newly-created-document

But "try to scroll the fragment" won't guarantee that the target element is set before that script can be run. And if I am understanding navigables right, it wouldn't be a navigation to a fragment either which does have "scroll to the fragment" in it. Would anyone be able to point me to the right direction of how the spec achieves updating the target element before the script is able to query it?