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Stacking issue with iframe + overflow:hidden #8310

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paulrouget opened this issue Nov 3, 2015 · 0 comments
Closed

Stacking issue with iframe + overflow:hidden #8310

paulrouget opened this issue Nov 3, 2015 · 0 comments
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A-layout/inline

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@paulrouget
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PR #8266 solves the stacking issue with overflow:hidden for regular elements, but with an iframe, stacking order is still wrong. The iframe element stacking level is ok (see its green border), but its content is not (blue square).

screen shot 2015-11-03 at 11 22 09

<style>

  .a {
    position: absolute;
    top: 20px;
    left: 20px;
    width: 400px;
    height: 400px;
    overflow: hidden;
  }

  .b {
    position: absolute;
    left: 0;
    top: 0;
    width: 200px;
    height: 200px;
    background-color: red;
  }

  iframe {
    border: 10px solid green;
  }

</style>

<body>

  <div class="a">
    <iframe src="data:text/html,<style>body{background:blue}</style>"></iframe>
  </div>

  <div class="b">

  </div>
</body>
This was referenced Nov 3, 2015
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mrobinson added a commit to mrobinson/servo that referenced this issue Nov 3, 2015
@mrobinson
Mix stacking contexts into the positioned content list
5b3e953 
Sometimes positioned content needs to be layered on top of stacking
contexts. The layer synthesis code can do this, but the current design
prevents it because stacking contexts are stored in a separate struct
member. In order to preserve tree order, mix stacking contexts into the
positioned content list, by adding a new StackingContextClass
DisplayItem. Such items do not have a base DisplayItem.

In some ways this simplifies the code, because we no longer have to
have a separate code path in the StackingContextLayerCreator.

Fixes servo#7779.
Fixes servo#7983.
Fixes servo#8122.
Fixes servo#8310.
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@jdm @paulrouget