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-rw-r--r--testing/web-platform/tests/selection/anonymous/details-ancestor.html40
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diff --git a/testing/web-platform/tests/selection/anonymous/details-ancestor.html b/testing/web-platform/tests/selection/anonymous/details-ancestor.html
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+++ b/testing/web-platform/tests/selection/anonymous/details-ancestor.html
@@ -0,0 +1,40 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Selecting internal node</title>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+<link rel="stylesheet" href="/fonts/ahem.css">
+<style>
+ details {
+ font: 16px/1 Ahem;
+ }
+</style>
+<details id="details"></details>
+<script>
+promise_test(async () => {
+ await new test_driver.Actions()
+ .pointerMove(5, 5, {origin: details})
+ .pointerDown()
+ .pointerMove(50, 50)
+ .pointerUp()
+ .send();
+ const selection = getSelection();
+
+ if (selection.anchorNode === null) {
+ // <details> is not selectable, which is acceptable
+ return;
+ }
+
+ // Gecko throws when accessing any property from DOM-invisible node
+ // so check we can access something
+ assert_equals(selection.anchorNode.constructor.name, "HTMLDetailsElement");
+ assert_equals(selection.anchorOffset, 0);
+ // Gecko limits the selection inside <details> while Blink does not
+ // so check something general
+ assert_equals(selection.focusNode.nodeType, Node.ELEMENT_NODE);
+ assert_equals(selection.focusOffset, 0);
+}, "Selecting the default summary of <details> should report a DOM-visible ancestor");
+</script>