BUG: WordPress Preview in Safari does not support JavaScript

I discovered that I can not test JavaScript code in my new blog posts using the preview feature from Safari.

Here is a simple test case:

<a href="javascript:alert('hi');">click to see alert message</a>

This code will call a pop-up link in firefox using the new blog preview page. But will not work in Safari. While the simple code snippet works fine in both Firefox and Safari if the blog post is published than viewed.

Safari version 5.1.7
MacOS version 10.7.4