... Apple's Safari has a hidden option which has been dealt with across the Mac community. The WebInspector is an invaluable tool when you're interested in HTML in general. The WebInspector can hand out loads of nicely formatted information of the webpage you're currently viewing.
To make the process of enabling Apple's Safari WebInspector very easy for the user, there's the WebInspector Toggler. This very simple tool features two buttons to toggle the WebInspector on or off.