[Webkit-unassigned] [Bug 139803] New: alpha linear-gradient background-image produces dark line at edge

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=139803

            Bug ID: 139803
           Summary: alpha linear-gradient background-image produces dark
                    line at edge
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Macintosh Intel
                OS: Mac OS X 10.10
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: webkit at rebertia.com

Created attachment 243535
  --> https://bugs.webkit.org/attachment.cgi?id=243535&action=review
Screenshot of the bug; note dark vertical line on right side of slide

Safari Version 8.0.2 (10600.2.5)
OS X Yosemite 10.10.1 (14B25)

To reproduce:
0. Go to a Mac with a non-retina screen.
1. In Safari 8, open http://getbootstrap.com/javascript/#carousel
       or http://bootstrapdocs.com/v3.2.0/docs/javascript/#carousel
2. Resize the window horizontally while observing the right side of the carousel.
3. As you resize, you'll observe a dark vertical line flicker in and out of view (see screenshot).
4. While the line is visible, stop resizing. The line will remain visible.
You can refresh the page or open the same page in a new tab (while keeping the window the same size)
to confirm that the bug is not related to resizing. (It's just necessary to discover what are the
right "magic" window widths where the bug is visible.)

Expected results:
There should be no dark vertical line at the edge of the alpha-channel gradient.

Further info:
If you inspect the
    <a class="right carousel-control" href="#carousel-example-generic" role="button" data-slide="next">
in the carousel (i.e. the carousel's right arrow)
and disable its "background-image: linear-gradient" CSS styles,
you'll observe that the line disappears, which indicates that the line is due to the gradient.

Original Bootstrap issue: https://github.com/twbs/bootstrap/issues/15205

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