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<!DOCTYPE bugzilla SYSTEM "https://bugs.webkit.org/page.cgi?id=bugzilla.dtd">

<bugzilla version="5.0.4.1"
          urlbase="https://bugs.webkit.org/"
          
          maintainer="admin@webkit.org"
>

    <bug>
          <bug_id>193107</bug_id>
          
          <creation_ts>2019-01-03 08:42:51 -0800</creation_ts>
          <short_desc>[ Mojave WK1 ] Layout Test fast/layers/blank-content-when-child-layer-is-at-negative-big-number.html and fast/layers/wrong-clipping-semi-transparent-compositing-layer-on-subpixel-position.html are flaky</short_desc>
          <delta_ts>2019-01-04 11:15:12 -0800</delta_ts>
          <reporter_accessible>1</reporter_accessible>
          <cclist_accessible>1</cclist_accessible>
          <classification_id>1</classification_id>
          <classification>Unclassified</classification>
          <product>WebKit</product>
          <component>Tools / Tests</component>
          <version>WebKit Nightly Build</version>
          <rep_platform>Unspecified</rep_platform>
          <op_sys>Unspecified</op_sys>
          <bug_status>NEW</bug_status>
          <resolution></resolution>
          
          <see_also>https://bugs.webkit.org/show_bug.cgi?id=193108</see_also>
          <bug_file_loc></bug_file_loc>
          <status_whiteboard></status_whiteboard>
          <keywords></keywords>
          <priority>P2</priority>
          <bug_severity>Normal</bug_severity>
          <target_milestone>---</target_milestone>
          
          
          <everconfirmed>1</everconfirmed>
          <reporter name="Truitt Savell">tsavell</reporter>
          <assigned_to name="Nobody">webkit-unassigned</assigned_to>
          <cc>ap</cc>
    
    <cc>jlewis3</cc>
    
    <cc>lforschler</cc>
    
    <cc>ryanhaddad</cc>
    
    <cc>simon.fraser</cc>
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>1491429</commentid>
    <comment_count>0</comment_count>
    <who name="Truitt Savell">tsavell</who>
    <bug_when>2019-01-03 08:42:51 -0800</bug_when>
    <thetext>The following layout tests are flaky on Mojave WK1

fast/layers/blank-content-when-child-layer-is-at-negative-big-number.html
fast/layers/wrong-clipping-semi-transparent-compositing-layer-on-subpixel-position.html

Probable cause:

These two tests are failing in tandem. They seem to be drawing something and unexpectedly zooming in on the result. similar to https://bugs.webkit.org/show_bug.cgi?id=192881 and https://bugs.webkit.org/show_bug.cgi?id=193091

Flakiness Dashboard:

https://webkit-test-results.webkit.org/dashboards/flakiness_dashboard.html#showAllRuns=true&amp;tests=fast%2Flayers%2Fblank-content-when-child-layer-is-at-negative-big-number.html%20fast%2Flayers%2Fwrong-clipping-semi-transparent-compositing-layer-on-subpixel-position.html

Image diffs:

fast/layers/blank-content-when-child-layer-is-at-negative-big-number.html
https://build.webkit.org/results/Apple%20Mojave%20Release%20WK1%20(Tests)/r239589%20(1907)/fast/layers/blank-content-when-child-layer-is-at-negative-big-number-diffs.html

fast/layers/wrong-clipping-semi-transparent-compositing-layer-on-subpixel-position.html
https://build.webkit.org/results/Apple%20Mojave%20Release%20WK1%20(Tests)/r239589%20(1907)/fast/layers/wrong-clipping-semi-transparent-compositing-layer-on-subpixel-position-diffs.html</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1491757</commentid>
    <comment_count>1</comment_count>
    <who name="Simon Fraser (smfr)">simon.fraser</who>
    <bug_when>2019-01-04 11:15:12 -0800</bug_when>
    <thetext>Mojave WK1 is basically a world of hurt.</thetext>
  </long_desc>
      
      

    </bug>

</bugzilla>