[Webkit-unassigned] [Bug 166754] Some checkboxes jump around when clicked

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=166754

--- Comment #1 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
Created attachment 298172
  --> https://bugs.webkit.org/attachment.cgi?id=298172&action=review
Testcase

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