File: extend-exception.html

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<!doctype html>
<html>
<title>Selection extend() test thrown exceptions</title>
<meta charset=utf-8>
<body>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script>
"use strict";

test(function() {
    let div = document.createElement("div");
    document.body.appendChild(div);

    assert_throws_dom("INVALID_STATE_ERR", function() { getSelection().extend(div) }, "InvalidStateError exception should be thrown for extend() due to no ranges being added to Selection");

    this.add_cleanup(function() { div.remove() });
}, "InvalidStateError exception is thrown for extend() when no ranges are present in Selection");
</script>
</body>
</html>