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diff --git a/layout/reftests/details-summary/details-first-line.html b/layout/reftests/details-summary/details-first-line.html
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+<!DOCTYPE html>
+<!-- Any copyright is dedicated to the Public Domain.
+ - http://creativecommons.org/publicdomain/zero/1.0/ -->
+
+<html>
+ <style>
+ summary {
+ display: inline; /* ::first-line appiles only to inline element. */
+ }
+
+ details::first-line {
+ color: blue;
+ }
+ </style>
+ <body>
+ <details>
+ <summary>Summary
+ <!-- Need ib-split so that the summary has multiple frames. -->
+ <div>Block in summary</div>
+ </summary>
+ <p>This is the details.</p>
+ </details>
+ </body>
+</html>