Web development and Javascript tricks and tips - a WIP compilation

I started putting together a list of neat tricks and tips, which haven't been frequently blogged about and which I picked up as I went along the way of web-development. Eventually the list should feature around ten entries.

So without further ado...
1) Web Development Tips and Tricks

2) Adding Content Before or After an HTML Element via CSS pseudoelement :before , :after
3) CSS Most important text overflow and wrapping options
4) A list of common HTTP header settings
5)JSON.stringify: Forcing Array notation for JavaScript's serialized function arguments