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-rw-r--r--layout/base/tests/chrome/test_shadow_root_adopted_styles.html11
1 files changed, 11 insertions, 0 deletions
diff --git a/layout/base/tests/chrome/test_shadow_root_adopted_styles.html b/layout/base/tests/chrome/test_shadow_root_adopted_styles.html
new file mode 100644
index 0000000000..d6701f3089
--- /dev/null
+++ b/layout/base/tests/chrome/test_shadow_root_adopted_styles.html
@@ -0,0 +1,11 @@
+<!doctype html>
+<meta charset="utf-8">
+<body>
+<script>
+ document.body.attachShadow({mode: "open"}).innerHTML = `
+ <div class="target"></div>
+ `;
+ const sheet = new CSSStyleSheet();
+ document.body.shadowRoot.adoptedStyleSheets = [sheet];
+ sheet.replaceSync(".target { width: 100px; height: 100px; border-style: solid; border-color: blue; }");
+</script>