author Markus Stange <>
Fri, 26 Feb 2016 01:29:41 +0100
changeset 323488 c690a0802e0007bb7e58bafeee672c816faa3cf5
parent 224492 6b53305f1c420766f6c41a93716be2af31e49588
permissions -rw-r--r--
Bug 1247854 - Apply the correct scroll clips to the nsDisplayTransform and nsDisplayPerspective of a scrolled perspective item. r=mattwoodrow a=ritu I've decided to fix this in a very explicit way. The only "magic" part that's left is how we decide that the AGR of the perspective item is outside the scrolled frame (and I'm not sure myself how that works). I didn't want to change what scroll clips we set on what items, because the scroll clip really belongs on the perspective item, because that's the item that needs to be clipped, and it should also be the item that should be scrolled if it weren't for the fact that APZ wouldn't know that it should apply the perspective transform before the APZ transform. MozReview-Commit-ID: BBw8VPohQI4

  <!-- Test that element content scrolls asynchronously even when content
       has to be split into separate layers with non-scrolling content in
       between -->
  <div style="width:400px; height:500px; overflow:hidden; border:2px solid black">
    <div style="height:450px"></div>
    <div style="height:100px; width:200px; float:left; background:purple"></div>
    <div style="left:200px; top:0; height:800px; width:300px; float:left; background:yellow; position:absolute; z-index:1;"></div>
    <div style="height:100px; width:200px; float:left; background:purple; position:relative; z-index:2;"></div>