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<!DOCTYPE html>
<html class="reftest-wait">
<title>Test transition from single-alpha layer to component-alpha layer from a display port size change</title>
<script type="text/javascript">
  document.addEventListener('MozReftestInvalidate', function() {
    var scrollbox = document.getElementById('scrollbox');
    scrollbox.scrollTop = 1000;

    window.addEventListener("MozAfterPaint", function() {
      // Remove dummy to make scrollbox the first scroll element giving it a
      // display port. The display port will then contain the text forcing the
      // layer to transition to component alpha.
      document.getElementById('dummy').remove();
      document.documentElement.className = '';
    }, {once: true});
  });
</script>
<style>
#dummy {
  margin: 20px;
  width: 300px;
  height: 400px;
  overflow: scroll;
}

#filler {
  height: 600px;
}

#scrollbox {
  margin: 20px;
  width: 300px;
  height: 400px;
  overflow-y: scroll;
  background: linear-gradient(#FFF, #FFF);
}

#inner {
  background-color: #000;
  margin-top: 10px;
  height: 5px;
  line-height: 5px;
  padding-bottom: 400px;
}
</style>

<div id="dummy">
  <div id="filler">
  </div>
</div>

<div id="scrollbox">
  <div id="inner">
    Text
  </div>
</div>