[Webkit-unassigned] [Bug 159703] New: Double background images when temporarily inserting block-level content in a span

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=159703

            Bug ID: 159703
           Summary: Double background images when temporarily inserting
                    block-level content in a span
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: peter.krautzberger at mathjax.org
                CC: simon.fraser at apple.com

Example URL: http://codepen.io/pkra/pen/mEqwAz

Steps to reproduce the problem:

1. Create a span and give it a background-image
2. inject an hr and trigger reflow (reflow is important)
3. remove the hr
4. notice that the duplicate background persist.

What is the expected behavior?
The background image should not be duplicated.

What went wrong?
The background image was duplicated.

Does it occur on multiple sites: Yes

Is it a problem with a plugin? No 

Did this work before? No 

This does not happen on Firefox or IE9+/Edge but also affects WebKit 2.10.9 and Chrome, cf. https://bugs.chromium.org/p/chromium/issues/detail?id=627736.

Thanks in advance for looking into it!

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