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diff --git a/testing/web-platform/tests/css/compositing/root-element-background-transparency.html b/testing/web-platform/tests/css/compositing/root-element-background-transparency.html
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+<!doctype HTML>
+<title>Backround color transparency on the root element blends with a white backdrop</title>
+<link rel="author" title="Chris Harrelson" href="mailto:chrishtr@chromium.org">
+<link rel="help" href="https://drafts.fxtf.org/compositing/#pagebackdrop">
+<link rel="match" href="root-element-background-transparency-ref.html">
+<html style="background: rgba(45, 45, 45, 0.5)">
+ <div id=spacer style="width: 100px; height: 3000px"></div>
+</html>