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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>
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