1 files changed, 19 insertions, 0 deletions
diff --git a/layout/reftests/details-summary/open-details-first-line-ref.html b/layout/reftests/details-summary/open-details-first-line-ref.html
new file mode 100644
index 000000000..d975ecfc7
--- /dev/null
+++ b/layout/reftests/details-summary/open-details-first-line-ref.html
@@ -0,0 +1,19 @@
+<!DOCTYPE html>
+<!-- Any copyright is dedicated to the Public Domain.
+   - http://creativecommons.org/publicdomain/zero/1.0/ -->
+
+<html>
+  <style>
+  div#details::first-line {
+    color: blue;
+  }
+  </style>
+  <body>
+    <div id="details">
+      <span>Summary
+        <div>Block in summary</div>
+      </span>
+      <span>This is the details.</span>
+    </div>
+  </body>
+</html>