<?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>215805</bug_id>
          
          <creation_ts>2020-08-25 04:36:11 -0700</creation_ts>
          <short_desc>Happens requests to the fallback image when the script detach and re-instert &lt;source/&gt; under &lt;picture/&gt; on document tree</short_desc>
          <delta_ts>2020-09-01 09:27:42 -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>Images</component>
          <version>WebKit Nightly Build</version>
          <rep_platform>Unspecified</rep_platform>
          <op_sys>Unspecified</op_sys>
          <bug_status>RESOLVED</bug_status>
          <resolution>DUPLICATE</resolution>
          <dup_id>159484</dup_id>
          <see_also>https://bugs.webkit.org/show_bug.cgi?id=159484</see_also>
    
    <see_also>https://bugs.webkit.org/show_bug.cgi?id=177068</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="Tetsuharu Ohzeki [UTC+9]">tetsuharu.ohzeki</reporter>
          <assigned_to name="Nobody">webkit-unassigned</assigned_to>
          <cc>sabouhallawa</cc>
    
    <cc>webkit-bug-importer</cc>
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>1682621</commentid>
    <comment_count>0</comment_count>
      <attachid>407183</attachid>
    <who name="Tetsuharu Ohzeki [UTC+9]">tetsuharu.ohzeki</who>
    <bug_when>2020-08-25 04:36:11 -0700</bug_when>
    <thetext>Created attachment 407183
testcase

## Environments
* Safari 14 on Big Sur beta 5
	* Safari TP 112 on that is also reproducible.

## Step to Reproduce
1. Extract testcase.zip.
2. Run `python -m SimpleHTTPServer`
3. Open Safari and open safari’s developer tools’ network pane.
4. Open index.html via launched in _step 2_.

## Expected Result
For images, Safari requests only `example_webp.webp`.

## Actual Result
For images Safari requests both of `example_webp.webp` and `example_png.png`

Sadly, today’s website use react or other view libraries to conceal an actual DOM manipluations. Their library are sometimes used to  “hydrates” web page on static html served by a server-side, then this kind of bugs causes multiple undesired image requests accidentally.

With webbev’s hat, the combination of `&lt;picture/&gt;` and `&lt;source type=&quot;image/webp&quot;/&gt;` are used as progressive enhancement techniques to use WebP images for supported browsers to reduce network bandwidth.   So this kind of bugs are not desired behavior.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1682622</commentid>
    <comment_count>1</comment_count>
    <who name="Tetsuharu Ohzeki [UTC+9]">tetsuharu.ohzeki</who>
    <bug_when>2020-08-25 04:37:35 -0700</bug_when>
    <thetext>I seem bug 159484 and bug 177068 are similar but I&apos;m not sure about they are duplicated of this.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1684435</commentid>
    <comment_count>2</comment_count>
    <who name="Radar WebKit Bug Importer">webkit-bug-importer</who>
    <bug_when>2020-09-01 04:37:19 -0700</bug_when>
    <thetext>&lt;rdar://problem/68135403&gt;</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1684494</commentid>
    <comment_count>3</comment_count>
    <who name="Said Abou-Hallawa">sabouhallawa</who>
    <bug_when>2020-09-01 09:27:42 -0700</bug_when>
    <thetext>This is the same as bug 159484. They both address the issue of loading multiple resources for the same &lt;picture&gt; element although a single resource will be displayed at the end.

*** This bug has been marked as a duplicate of bug 159484 ***</thetext>
  </long_desc>
      
          <attachment
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              ispatch="0"
              isprivate="0"
          >
            <attachid>407183</attachid>
            <date>2020-08-25 04:36:11 -0700</date>
            <delta_ts>2020-08-25 04:36:11 -0700</delta_ts>
            <desc>testcase</desc>
            <filename>testcase.zip</filename>
            <type>application/zip</type>
            <size>12117</size>
            <attacher name="Tetsuharu Ohzeki [UTC+9]">tetsuharu.ohzeki</attacher>
            
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    </bug>

</bugzilla>