Bug 217240 - REGRESSION (r257839): Broken focus when 'display' changes in an attribute selector
Summary: REGRESSION (r257839): Broken focus when 'display' changes in an attribute sel...
Alias: None
Product: WebKit
Classification: Unclassified
Component: Layout and Rendering (show other bugs)
Version: WebKit Nightly Build
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Nobody
Keywords: InRadar
: 220580 (view as bug list)
Depends on:
Reported: 2020-10-02 11:14 PDT by Ali Juma
Modified: 2021-01-13 11:20 PST (History)
17 users (show)

See Also:

Test case (936 bytes, text/html)
2020-10-02 11:14 PDT, Ali Juma
no flags Details
patch (4.83 KB, patch)
2021-01-12 03:45 PST, Antti Koivisto
no flags Details | Formatted Diff | Diff
patch (5.53 KB, patch)
2021-01-13 04:26 PST, Antti Koivisto
no flags Details | Formatted Diff | Diff
alternative (6.26 KB, patch)
2021-01-13 06:07 PST, Antti Koivisto
ews-feeder: commit-queue-
Details | Formatted Diff | Diff

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Description Ali Juma 2020-10-02 11:14:01 PDT
Created attachment 410344 [details]
Test case

This is similar to bug 216754 and bug 216257 but still broken after those fixes.

The conditions needed for this bug are:
1) An element E is display:none because of an attribute selector
2) Script asks for E's computed style's display property
3) The attribute from the attribute selector changes so that E is now display:block
4) Some descendant D of E is focused using D.focus()

After r257839, we end up using the stale computed style stored at step (2) when checking for hidden ancestors in Element::isVisibleWithoutResolvingFullStyle(), so incorrectly conclude that D is not visible.

I've attached a test case. 

In practice, this is happening on m.youtube.com in Chrome for iOS, where tapping on the search button will fail to focus the search field. In that case, the code asking for the computed style is actually in Chrome's injected logic for autofill and translation. However, the attached test case reproduces the bug more generally (in MiniBrowser and Safari).
Comment 1 Radar WebKit Bug Importer 2020-10-02 12:15:12 PDT
Comment 2 Antti Koivisto 2021-01-12 03:05:32 PST
Attribute change invalidation fails to invalidate the computed style.
Comment 3 Antti Koivisto 2021-01-12 03:45:44 PST
Created attachment 417442 [details]
Comment 4 Antti Koivisto 2021-01-13 04:26:29 PST
Created attachment 417524 [details]
Comment 5 Antti Koivisto 2021-01-13 05:30:44 PST
*** Bug 220580 has been marked as a duplicate of this bug. ***
Comment 6 Antti Koivisto 2021-01-13 06:07:54 PST
Created attachment 417527 [details]
Comment 7 Antti Koivisto 2021-01-13 11:08:27 PST
Speedometer A/B looks good.
Comment 8 EWS 2021-01-13 11:20:48 PST
Committed r271446: <https://trac.webkit.org/changeset/271446>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 417524 [details].