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Stephen Ritchie's offerings of ruthlessly helpful .NET practices.
There is a lot to know about HTML5 shims, fallbacks and polyfills. Let’s start by trying to define the terms and point to some places on the web to get more information.
The whole idea is to provide a way to develop pages in HTML5 and have everything work properly in a browser that doesn’t natively support HTML5 functionality. For example, this approach can enable the new HTML5 features within IE7.
Noun: A relatively small library (js, plugin, etc.) that gets in between the HTML5 and the incompatible browser and patches things — transparently — so the page works properly or as close as practicable. Sometimes referred to as a “shiv”. More info: The Story of the HTML5 Shiv
Noun: A backup plan when your page detects that it’s being displayed in an incompatible browser. More info: Yet another HTML5 fallback strategy for IE