[Webkit-unassigned] [Bug 216418] New: visibility: hidden does not remove focus

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=216418

            Bug ID: 216418
           Summary: visibility: hidden does not remove focus
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Macintosh
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: timdream at gmail.com

Created attachment 408558

  --> https://bugs.webkit.org/attachment.cgi?id=408558&action=review

testcase

STR:

See test case, the page will

0. check the current focused element by looking at `document.activeElement`.
1. focus() the element
2. set visibility: hidden on the element
3. wait for 100ms
4. check the current focused element by looking at `document.activeElement` again.

Expected:

On Chrome on step 4, the focused element is the body

Actual:

On Safari and Firefox, the focused element is still the element.

Note:

1. The inconsistency suggests that there may be a spec issue here.
2. On Chrome sometime a micro task is enough for the focus to moved away, some times it is not.

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