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-rw-r--r--testing/web-platform/tests/css/compositing/root-element-opacity-change.html14
1 files changed, 14 insertions, 0 deletions
diff --git a/testing/web-platform/tests/css/compositing/root-element-opacity-change.html b/testing/web-platform/tests/css/compositing/root-element-opacity-change.html
new file mode 100644
index 0000000000..de2599de49
--- /dev/null
+++ b/testing/web-platform/tests/css/compositing/root-element-opacity-change.html
@@ -0,0 +1,14 @@
+<!doctype HTML>
+<html class="test-wait" style="font-size: 200px; opacity: 0.5">
+<link rel="help" href="https://drafts.fxtf.org/compositing/#pagebackdrop">
+<link rel="match" href="root-element-opacity-change-ref.html">
+<meta name="assert" content="View background should be white after opacity changes from 0.5 to 1">
+<script src="/common/rendering-utils.js"></script>
+TEST
+<script>
+waitForAtLeastOneFrame().then(() => {
+ document.documentElement.style.opacity=1;
+ document.documentElement.classList.remove('test-wait');
+});
+</script>
+</html>