1 files changed, 34 insertions, 0 deletions
diff --git a/testing/web-platform/mozilla/tests/dom/range-in-two-selections.html b/testing/web-platform/mozilla/tests/dom/range-in-two-selections.html
new file mode 100644
index 0000000000..a37464d55a
--- /dev/null
+++ b/testing/web-platform/mozilla/tests/dom/range-in-two-selections.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<html>
+
+<head>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+</head>
+
+<body>
+<span>One two</span>
+<script>
+promise_test(async function (t) {
+    await new Promise(resolve => {
+        window.onload = resolve;
+    })
+    const range = document.createRange();
+    range.setStart(document.body, 0);
+    range.setEnd(document.body, 1);
+    const highlight = new Highlight(range);
+    CSS.highlights.set("foo", highlight);
+    document.getSelection().addRange(range);
+
+    const highlightRange = highlight.entries().next().value[0];
+    const selectionRange = document.getSelection().getRangeAt(0);
+    assert_equals(
+        highlightRange,
+        selectionRange,
+        "The same range must be present in the highlight and the Selection."
+    );
+}, "Range is shared between a custom highlight and the document's Selection.");
+</script>
+</body>
+
+</html>