1 files changed, 31 insertions, 0 deletions
diff --git a/layout/reftests/async-scrolling/position-fixed-inside-sticky-1.html b/layout/reftests/async-scrolling/position-fixed-inside-sticky-1.html
new file mode 100644
index 000000000..2aab3d5d6
--- /dev/null
+++ b/layout/reftests/async-scrolling/position-fixed-inside-sticky-1.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html reftest-async-scroll
+      reftest-displayport-x="0" reftest-displayport-y="0"
+      reftest-displayport-w="800" reftest-displayport-h="2000"
+      reftest-async-scroll-x="0" reftest-async-scroll-y="50">
+<style>
+body {
+  height: 4000px;
+  margin: 0;
+  overflow: hidden;
+}
+#sticky {
+  position: sticky;
+  top: -1000px; /* scrolls regularly until the top edge hits -1000px, then stays fixed */
+  height: 1200px;
+  border-bottom: 1px solid black;
+}
+#fixed {
+  position: fixed;
+  top: 50px;
+  left: 50px;
+  width: 100px;
+  height: 100px;
+  box-sizing: border-box;
+  border: 1px solid blue;
+}
+</style>
+<div id="sticky">
+  <div id="fixed"></div>
+</div>
+</html>