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diff --git a/testing/web-platform/tests/inert/inert-node-is-unselectable.html b/testing/web-platform/tests/inert/inert-node-is-unselectable.html
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index 0000000000..b99af0d4cd
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+++ b/testing/web-platform/tests/inert/inert-node-is-unselectable.html
@@ -0,0 +1,20 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8" />
+    <title>inert nodes are unselectable</title>
+    <link rel="author" title="Alice Boxhall" href="aboxhall@chromium.org">
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+<body>
+  <div inert>Here is a text node you can't select.</div>
+  <div>I'm selectable.</div>
+<script>
+test(function() {
+    document.execCommand('SelectAll');
+    assert_equals(window.getSelection().toString().trim(), "I'm selectable.");
+}, "Inert nodes cannot be selected.");
+</script>
+</body>
+</html>