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Published by Chris Coyier The following is a guest post by Menno van Slooten . You might notice we've been down this road before , but I quite like Menno's approach here. The end result proves you can get a little fancier with the design than I originally did, with borders, gradients, and shadows and while actually using less elements. A good-looking tab control usually has one feature that I've always found impossible to reproduce without images: borders that bend to the outside at the bottom of each tab. In this article I would like to show how you can use the CSS :before and :after pseudo elements to create this effect without using images. (Better) Tabs with Round Out Borders
So here we're collecting all the shims, fallbacks, and polyfills in order to implant html5 functionality in browsers that don't natively support them. The general idea is that: we, as developers, should be able to develop with the HTML5 apis, and scripts can create the methods and objects that should exist. Developing in this future-proof way means as users upgrade, your code doesn't have to change but users will move to the better, native experience cleanly. Looking for a way to conditionally load these scripts client-side based on feature detects? See Modernizr .