gecko-dev/layout/reftests/async-scrolling/dynamic-toolbar-fixed-top-1...

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HTML

<!DOCTYPE HTML>
<!--
Tests that setting a fixed top margin in the compositor results
in the margin being applied to an element fixed to the top.
The fixed margin is specified as a test-pref in reftest.list.
The purpose of the fixed margin is to compensate for the transform that the
dynamic toolbar applies to the entire content area. We don't have a way of
simulating that transform in a reftest, so the fixed margin in isolation will
cause the fixed element to be offset from the top of the screen, and in
the ref page we use a regular CSS "margin-top" to match the rendering.
-->
<html>
<meta name="viewport" content="width=device-width">
<style>
html {
scrollbar-width: none;
}
#scrolled {
height: 2000px;
width: 100%;
}
#fixed {
width: 100%;
height: 200px;
position: fixed;
top: 0;
background: red;
}
</style>
<body>
<div id="scrolled"></div>
<div id="fixed"></div>
</body>
</html>