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chromium/third_party/blink/web_tests/fast/forms/select/select-set-length.html 

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
<head>
<script src="../../../resources/js-test.js"></script>
</head>
<body>
<p id="description"></p>
<div id="console"></div>
<script>
description('Tests that setting the .length of an HTMLSelectElement correctly creates and destroys options.');

var sel = document.createElement('select');
document.body.appendChild(sel);

shouldBe('sel.length', '0');

sel.length = 200;
shouldBe('sel.length', '200');

sel.length = 100;
shouldBe('sel.length', '100');

sel.length = 180;
shouldBe('sel.length', '180');
</script>
</body>
</html>