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-rw-r--r--layout/reftests/webcomponents/style-sharing-across-shadow.html22
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diff --git a/layout/reftests/webcomponents/style-sharing-across-shadow.html b/layout/reftests/webcomponents/style-sharing-across-shadow.html
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+++ b/layout/reftests/webcomponents/style-sharing-across-shadow.html
@@ -0,0 +1,22 @@
+<!doctype html>
+<style>
+ div { display: contents }
+</style>
+<div></div>
+<div></div>
+<script>
+ let divs = document.querySelectorAll('div');
+ divs[0].attachShadow({mode: 'open'}).innerHTML = `
+ <style>
+ * { color: green; }
+ </style>
+ <span>Should be green</span>
+ `;
+ divs[1].attachShadow({mode: 'open'}).innerHTML = `
+ <style>
+ * { color: initial; }
+ [foo] { }
+ </style>
+ <span>Should not be green</span>
+ `;
+</script>