[Webkit-unassigned] [Bug 158340] New: :hover CSS pseudo-class sometimes keeps matching ever after mouse has left the element

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=158340

            Bug ID: 158340
           Summary: :hover CSS pseudo-class sometimes keeps matching ever
                    after mouse has left the element
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: OS X 10.11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: webkit at chrisrebert.com

Created attachment 280426
  --> https://bugs.webkit.org/attachment.cgi?id=280426&action=review
Video of the bug in action

Steps to reproduce:
1. Open https://jsfiddle.net/cvrebert/rgq9zwc2/ in WebKit Nightly or Safari 9.
2. Move the mouse pointer to the star in the lower-right corner.
3. Observe that a tooltip appears.
4. Move the mouse pointer vertically upward along the column of stars.

Actual result:
Several of the gray boxes turn blue and stay blue,
indicating that the :hover pseudo-class is applying to several of them simultaneously.
See attached video, courtesy of https://github.com/RopoMen

Expected result:
Only the box currently being hovered over should be blue.
Each box should turn gray again immediately after the pointer moves outside of the box's respective bounds.

Original Bootstrap bug:
https://github.com/twbs/bootstrap/issues/20012

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