<?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>187220</bug_id>
          
          <creation_ts>2018-06-30 08:45:11 -0700</creation_ts>
          <short_desc>[LFC] If the top and bottom margins of a box are adjoining, then it is possible for margins to collapse through it.</short_desc>
          <delta_ts>2018-06-30 11:07:18 -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>Layout and Rendering</component>
          <version>WebKit Nightly Build</version>
          <rep_platform>Unspecified</rep_platform>
          <op_sys>Unspecified</op_sys>
          <bug_status>RESOLVED</bug_status>
          <resolution>FIXED</resolution>
          
          
          <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="alan">zalan</reporter>
          <assigned_to name="alan">zalan</assigned_to>
          <cc>bfulgham</cc>
    
    <cc>koivisto</cc>
    
    <cc>simon.fraser</cc>
    
    <cc>webkit-bug-importer</cc>
    
    <cc>zalan</cc>
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>1438171</commentid>
    <comment_count>0</comment_count>
    <who name="alan">zalan</who>
    <bug_when>2018-06-30 08:45:11 -0700</bug_when>
    <thetext>ssia</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1438172</commentid>
    <comment_count>1</comment_count>
      <attachid>344014</attachid>
    <who name="alan">zalan</who>
    <bug_when>2018-06-30 08:46:52 -0700</bug_when>
    <thetext>Created attachment 344014
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1438177</commentid>
    <comment_count>2</comment_count>
    <who name="alan">zalan</who>
    <bug_when>2018-06-30 11:06:32 -0700</bug_when>
    <thetext>Committed r233398: &lt;https://trac.webkit.org/changeset/233398&gt;</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1438178</commentid>
    <comment_count>3</comment_count>
    <who name="Radar WebKit Bug Importer">webkit-bug-importer</who>
    <bug_when>2018-06-30 11:07:18 -0700</bug_when>
    <thetext>&lt;rdar://problem/41679718&gt;</thetext>
  </long_desc>
      
          <attachment
              isobsolete="0"
              ispatch="1"
              isprivate="0"
          >
            <attachid>344014</attachid>
            <date>2018-06-30 08:46:52 -0700</date>
            <delta_ts>2018-06-30 10:22:24 -0700</delta_ts>
            <desc>Patch</desc>
            <filename>bug-187220-20180630084651.patch</filename>
            <type>text/plain</type>
            <size>5764</size>
            <attacher name="alan">zalan</attacher>
            
              <data encoding="base64">U3VidmVyc2lvbiBSZXZpc2lvbjogMjMzMzU3CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D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</data>
<flag name="review"
          id="362066"
          type_id="1"
          status="+"
          setter="koivisto"
    />
          </attachment>
      

    </bug>

</bugzilla>