NEW305922
location.ancestorOrigins should return a new value every time 
https://bugs.webkit.org/show_bug.cgi?id=305922
Summary location.ancestorOrigins should return a new value every time
Simon Pieters (:zcorpan)
Reported 2026-01-21 08:11:38 PST
See https://github.com/whatwg/html/pull/12071
Attachments
Add attachment proposed patch, testcase, etc.
Alexey Proskuryakov
Comment 1 2026-01-21 17:32:56 PST
Thank you for the report! We can probably figure it out with more effort, but from a cursory glance at the issue, I'm not sure which exact aspect of the discussion this bug covers. Would you mind clarifying? A test case would be ideal, of course.
Simon Pieters (:zcorpan)
Comment 2 2026-01-22 00:18:02 PST
This is mainly about removing `[SameObject, CachedAttribute]` so that a new `DOMTokenList` object is returned every time. The spec says to compute the list when a `Document` is created, but without the `referrerpolicy` change I think it's not observable if it's computed lazily. (You can still cache the underlying array, so long as you return a new `DOMTokenList` every time and make sure to return an empty list when the document is not active.) Tests are linked from the spec PR.
Radar WebKit Bug Importer
Comment 3 2026-01-28 08:12:12 PST
<rdar://problem/169097730>
Anne van Kesteren
Comment 5 2026-01-30 02:05:49 PST
Note that I left feedback on the PR. Returning a new object for getter each time it is invoked would be a very surprising behavior and go against API design guidelines. There might well be something we have to change, but what exactly isn't clear yet.
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