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+<!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>