<?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>158325</bug_id>
          
          <creation_ts>2016-06-02 16:04:09 -0700</creation_ts>
          <short_desc>Fixed position interaction broken with WKWebView when scrollView.bounce is false</short_desc>
          <delta_ts>2018-06-11 13:01:37 -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>Safari 9</version>
          <rep_platform>iPhone / iPad</rep_platform>
          <op_sys>iOS 9.3</op_sys>
          <bug_status>NEW</bug_status>
          <resolution></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="Darryl Pogue">dvpdiner2</reporter>
          <assigned_to name="Nobody">webkit-unassigned</assigned_to>
          <cc>bjorn.rombaut1991</cc>
    
    <cc>enrica</cc>
    
    <cc>jonlee</cc>
    
    <cc>patogalan82</cc>
    
    <cc>simon.fraser</cc>
    
    <cc>sven</cc>
    
    <cc>wart.claes</cc>
    
    <cc>webkit-bug-importer</cc>
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>1198729</commentid>
    <comment_count>0</comment_count>
      <attachid>280380</attachid>
    <who name="Darryl Pogue">dvpdiner2</who>
    <bug_when>2016-06-02 16:04:09 -0700</bug_when>
    <thetext>Created attachment 280380
iOS App demonstration case

In a page with a fixed position header that contains interactive elements like buttons or links when shown in a WKWebView with rubberbanding disabled, it is possible for the logical interaction position of the element to get out of sync with the visual position of the element.

This happens when you do a scroll action that would normally trigger the rubberbanding effect. It has the effect of moving the logical position of the element further down the page as if rubberbanding has occurred.
The visual position is correct.

I&apos;ve attached a simple test case iOS project that can reproduce the issue. The code for the test case is also available on GitHub: https://github.com/dpogue/WKScrollTest</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1199620</commentid>
    <comment_count>1</comment_count>
    <who name="Radar WebKit Bug Importer">webkit-bug-importer</who>
    <bug_when>2016-06-06 10:49:44 -0700</bug_when>
    <thetext>&lt;rdar://problem/26652772&gt;</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1199775</commentid>
    <comment_count>2</comment_count>
    <who name="Simon Fraser (smfr)">simon.fraser</who>
    <bug_when>2016-06-06 16:47:58 -0700</bug_when>
    <thetext>I can reproduce.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1199792</commentid>
    <comment_count>3</comment_count>
    <who name="Simon Fraser (smfr)">simon.fraser</who>
    <bug_when>2016-06-06 17:18:53 -0700</bug_when>
    <thetext>This happens because we get no &quot;stable&quot; viewport rect updates when a bounce would otherwise happen.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1199795</commentid>
    <comment_count>4</comment_count>
    <who name="Simon Fraser (smfr)">simon.fraser</who>
    <bug_when>2016-06-06 17:29:04 -0700</bug_when>
    <thetext>It&apos;s odd that in -scrollViewDidEndDragging:willDecelerate:, [scrollView isDragging] is still true.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1208610</commentid>
    <comment_count>5</comment_count>
    <who name="Bjorn Rombaut">bjorn.rombaut1991</who>
    <bug_when>2016-07-07 07:27:28 -0700</bug_when>
    <thetext>Any news about this?</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1239743</commentid>
    <comment_count>6</comment_count>
    <who name="Sven Peeters">sven</who>
    <bug_when>2016-10-13 05:01:36 -0700</bug_when>
    <thetext>+1</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1271376</commentid>
    <comment_count>7</comment_count>
    <who name="Darryl Pogue">dvpdiner2</who>
    <bug_when>2017-01-30 12:29:47 -0800</bug_when>
    <thetext>I think this was just fixed by https://trac.webkit.org/changeset/211379 in #167484 ?</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1271378</commentid>
    <comment_count>8</comment_count>
    <who name="Simon Fraser (smfr)">simon.fraser</who>
    <bug_when>2017-01-30 12:42:13 -0800</bug_when>
    <thetext>I don&apos;t think so. Comment 3 still applies.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1284840</commentid>
    <comment_count>9</comment_count>
    <who name="Pato">patogalan82</who>
    <bug_when>2017-03-08 04:58:36 -0800</bug_when>
    <thetext>Hi Gents, has this come to any solution yet? I&apos;ve been goong crazy for the past days trying to come up with a plausible solution... I am using Cordova with WkWebview...</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1284841</commentid>
    <comment_count>10</comment_count>
    <who name="Bjorn Rombaut">bjorn.rombaut1991</who>
    <bug_when>2017-03-08 05:03:29 -0800</bug_when>
    <thetext>(In reply to comment #9)
&gt; Hi Gents, has this come to any solution yet? I&apos;ve been goong crazy for the
&gt; past days trying to come up with a plausible solution... I am using Cordova
&gt; with WkWebview...

Our current workaround is to scroll 1px after the user has stopped scrolling, but it&apos;s a really dirty workaround. We&apos;re still waiting for a proper solution.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1292735</commentid>
    <comment_count>11</comment_count>
    <who name="Wart Claes">wart.claes</who>
    <bug_when>2017-03-30 00:33:24 -0700</bug_when>
    <thetext>Any news about this issue?</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1431978</commentid>
    <comment_count>12</comment_count>
    <who name="Darryl Pogue">dvpdiner2</who>
    <bug_when>2018-06-11 11:39:13 -0700</bug_when>
    <thetext>I was revisiting this today, and I don&apos;t seem to be able to reproduce it on iOS 11 or 12. However, there&apos;s nothing on this ticket or any references to the Radar ticket in any WebKit commits, so I can&apos;t confirm that it&apos;s actually fixed.

@smfr Is it possible that this was fixed in https://trac.webkit.org/changeset/211197 (https://bugs.webkit.org/show_bug.cgi?id=167440) when switching from UIWebScrollView to UIScrollView?</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1432013</commentid>
    <comment_count>13</comment_count>
    <who name="Simon Fraser (smfr)">simon.fraser</who>
    <bug_when>2018-06-11 13:01:37 -0700</bug_when>
    <thetext>It&apos;s possible that a UIKit change fixed it.</thetext>
  </long_desc>
      
          <attachment
              isobsolete="0"
              ispatch="0"
              isprivate="0"
          >
            <attachid>280380</attachid>
            <date>2016-06-02 16:04:09 -0700</date>
            <delta_ts>2016-06-02 16:04:09 -0700</delta_ts>
            <desc>iOS App demonstration case</desc>
            <filename>WKScrollTest.zip</filename>
            <type>application/zip</type>
            <size>11140</size>
            <attacher name="Darryl Pogue">dvpdiner2</attacher>
            
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          </attachment>
      

    </bug>

</bugzilla>