component/url — pull request #4 by nulltask (2013-04-06 06:43:15+00:00)
Title: `isCrossDomain()` returns always true in Safari 5.0.

in Safari 5.0.5

```
var a = document.createElement('a');
a.href = '/foo/bar';
a.port; // => "0"

location.port; // => ""
```