Do not expose chromeonly nodes via Selection API
Differential Revision: https://phabricator.services.mozilla.com/D93258
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1669996
gecko-commit: e4b4e21f57de82d9ba9a4a984748dd03c6650785
gecko-reviewers: emilio
diff --git a/selection/select-internal.html b/selection/select-internal.html
new file mode 100644
index 0000000..305e26d
--- /dev/null
+++ b/selection/select-internal.html
@@ -0,0 +1,34 @@
+<!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();
+ // 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>
