<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<!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>299073</bug_id>
          
          <creation_ts>2025-09-18 02:29:22 -0700</creation_ts>
          <short_desc>Some page elements have a blue flicker (caused by @starting-style)</short_desc>
          <delta_ts>2025-09-19 03:11:10 -0700</delta_ts>
          <reporter_accessible>1</reporter_accessible>
          <cclist_accessible>1</cclist_accessible>
          <classification_id>1</classification_id>
          <classification>Unclassified</classification>
          <product>WebKit</product>
          <component>CSS</component>
          <version>WebKit Nightly Build</version>
          <rep_platform>Unspecified</rep_platform>
          <op_sys>Unspecified</op_sys>
          <bug_status>RESOLVED</bug_status>
          <resolution>FIXED</resolution>
          
          <see_also>https://github.com/web-platform-tests/wpt/pull/54944</see_also>
          <bug_file_loc></bug_file_loc>
          <status_whiteboard></status_whiteboard>
          <keywords>InRadar</keywords>
          <priority>P2</priority>
          <bug_severity>Normal</bug_severity>
          <target_milestone>---</target_milestone>
          
          
          <everconfirmed>1</everconfirmed>
          <reporter name="Antti Koivisto">koivisto</reporter>
          <assigned_to name="Antti Koivisto">koivisto</assigned_to>
          <cc>koivisto</cc>
    
    <cc>webkit-bug-importer</cc>
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>2143898</commentid>
    <comment_count>0</comment_count>
    <who name="Antti Koivisto">koivisto</who>
    <bug_when>2025-09-18 02:29:22 -0700</bug_when>
    <thetext>Reduction

&lt;style&gt;

div {
    position: absolute;
    width: 100px;
    height: 100px;
}

@keyframes animation {
    from, to { margin-left: 0 }
}

@starting-style {
    .parent:after { }
}

.parent {
    animation: animation 1s;
}

.child:after {
    content: &quot;&quot;;
    position: absolute;
    inset: 0;
    background-color: black;
    animation: animation 1s;
}

&lt;/style&gt;

&lt;div class=&quot;parent&quot;&gt;
    &lt;div class=&quot;child&quot;&gt;&lt;/div&gt;
&lt;/div&gt;</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>2143899</commentid>
    <comment_count>1</comment_count>
    <who name="Antti Koivisto">koivisto</who>
    <bug_when>2025-09-18 02:29:44 -0700</bug_when>
    <thetext>rdar://154228431</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>2143900</commentid>
    <comment_count>2</comment_count>
    <who name="Antti Koivisto">koivisto</who>
    <bug_when>2025-09-18 02:34:08 -0700</bug_when>
    <thetext>Pull request: https://github.com/WebKit/WebKit/pull/50921</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>2144030</commentid>
    <comment_count>3</comment_count>
    <who name="EWS">ews-feeder</who>
    <bug_when>2025-09-18 10:42:19 -0700</bug_when>
    <thetext>Committed 300169@main (27e097a3c04d): &lt;https://commits.webkit.org/300169@main&gt;

Reviewed commits have been landed. Closing PR #50921 and removing active labels.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>2144285</commentid>
    <comment_count>4</comment_count>
    <who name="Antti Koivisto">koivisto</who>
    <bug_when>2025-09-19 00:28:36 -0700</bug_when>
    <thetext>Submitted web-platform-tests pull request: https://github.com/web-platform-tests/wpt/pull/54944</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>2144304</commentid>
    <comment_count>5</comment_count>
    <who name="EWS">ews-feeder</who>
    <bug_when>2025-09-19 03:11:10 -0700</bug_when>
    <thetext>Committed 297297.438@safari-7622-branch (65af04e610af): &lt;https://commits.webkit.org/297297.438@safari-7622-branch&gt;

Reviewed commits have been landed. Closing PR #3674 and removing active labels.</thetext>
  </long_desc>
      
      

    </bug>

</bugzilla>