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chromium/third_party/blink/web_tests/fast/dom/HTMLAnchorElement/get-href-attribute-port.html 

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
<head>
<script src="../../../resources/js-test.js"></script>
</head>
<body>
<script>
description('Test getting the port attribute of the URL in HTMLAnchorElement.');

var a = document.createElement('a');

debug("Default port is empty");
shouldBe("a.port", "''");

debug("Unspecified port should return empty string");
a.href = "http://example.com/";
shouldBe("a.port", "''");

debug("Empty port should be empty");
a.href = "http://example.com:/";
shouldBe("a.port", "''");
</script>
</body>
</html>