third_party/web_platform_tests/dom/ranges/Range-constructor.html

<!doctype html>
<title>Range constructor test</title>
<link rel="author" title="Aryeh Gregor" href=ayg@aryeh.name>
<div id=log></div>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script>
"use strict";

test(function() {
    var range = new Range();
    assert_equals(range.startContainer, document, "startContainer");
    assert_equals(range.endContainer, document, "endContainer");
    assert_equals(range.startOffset, 0, "startOffset");
    assert_equals(range.endOffset, 0, "endOffset");
    assert_true(range.collapsed, "collapsed");
    assert_equals(range.commonAncestorContainer, document,
                  "commonAncestorContainer");
});
</script>