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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 sticky 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.
+-->
+<html>
+<meta name="viewport" content="width=device-width">
+<style>
+html {
+ scrollbar-width: none;
+}
+#scrolled {
+ display: flex;
+ justify-content: space-around;
+ align-items: flex-start;
+
+ height: 2000px;
+ width: 100%;
+}
+#sticky {
+ width: 100%;
+ height: 200px;
+ position: sticky;
+ top: 20px;
+ background: red;
+}
+</style>
+<body>
+ <div id="scrolled">
+ <div id="sticky"></div>
+ </div>
+</body>
+</html>