gecko-dev/testing/web-platform/tests/selection/getRangeAt.html

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<!DOCTYPE html>
<title>The getRangeAt method</title>
<div id=log></div>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script>
test(function() {
var sel = getSelection();
var range = document.createRange();
sel.addRange(range);
assert_throws("INDEX_SIZE_ERR", function() { sel.getRangeAt(-1); })
assert_throws("INDEX_SIZE_ERR", function() { sel.getRangeAt(1); })
});
</script>