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For those interested in adding blur effects.. CSS filters are coming so that you can blur any DOM element, also images: https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/publish/Fil...

Also worth mentioning: the latest proposal from Adobe, Apple and Opera, a complement to CSS filters - CSS shaders https://dvcs.w3.org/hg/FXTF/raw-file/tip/custom/index.html

In some browsers, notably Firefox, you can place a "blur layer" over anything using an SVG background featuring an SVG blur filter.