Safari 4 (beta) (for Mac and PC ) can help you, but after downloading and installing it, you will need to go to your settings and enable the developer’s settings, and then restart Safari. This will give you a Developer menu item with options for changing User Agent, JavaScript Profiler and Debugger and a small Web Inspector window (docked or floating) that gives you access to (X) HTML, CSS, Resources (assets and time), JavaScript, JavaScript Profiling and HTML5 Database.
In addition, it provides you with a JavaScript console so that you can make calls on the currently displayed page to check settings, variables, DOM walking and many other various little things, all in real time. Pretty powerful and very good.
Once you are tweeked that you are tweeking, just copy your changes (or pay attention to them) to make changes to your source. I was just starting to gain access to his power, and I must say that so far it has been real joy - amazing.
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