1 files changed, 40 insertions, 0 deletions
diff --git a/layout/reftests/meta-viewport/dynamic-grow-width-and-height.html b/layout/reftests/meta-viewport/dynamic-grow-width-and-height.html
new file mode 100644
index 0000000000..a9b98e86cc
--- /dev/null
+++ b/layout/reftests/meta-viewport/dynamic-grow-width-and-height.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<!--
+  `reftest-snapshot-all` is necessary to take the screenshot for whole canvas
+  when zoom level is changed.
+  This is the same as what we do in the case where reftest-async-zoom is
+  specified.
+ -->
+<html class="reftest-wait reftest-snapshot-all">
+<meta name="viewport" content="width=device-width, minimum-scale=0.5">
+<style>
+html {
+  overflow-x: hidden;
+  scrollbar-width: none;
+}
+html, body {
+  margin: 0;
+  width: 100%;
+  height: 100%;
+}
+div {
+  position: absolute;
+}
+</style>
+<div id="green" style="background: green; width: 100%; height: 100%;"></div>
+<div style="background: blue; width: 100%; height: 100%;"></div>
+<script>
+document.addEventListener('MozReftestInvalidate', () => {
+  green.style.width = '200%';
+  requestAnimationFrame(() => {
+    // At this moment we don't scale down the contents due to bug 1508177.
+
+    green.style.height = '200%';
+    requestAnimationFrame(() => {
+      // Growing height should make the overflow-x:hidden area visible.
+      document.documentElement.classList.remove('reftest-wait');
+    });
+  });
+});
+</script>
+</html>