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border-radius

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-

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SVG

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All modern browsers support SVG. For legacy browsers, you can use svgweb as a flash-based polyfill, or develop with Raphaél which has a VML renderer for oldIE.

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Canvas

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FlashCanvas or excanvas are your polyfills of choice if you absolutely need it.

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Video/Audio

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Use mediaelement.js as polyfill for API (flash fallback w/ consistent visual design too).. Video for everyone base setup if No polyfill desired.

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CSS3 Selectors

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data-* attributes

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GROOVY everywhere obv. old browsers ignore unknown attributes, you can always use getAttribute or you can use the dataset polyfill for IE8+.

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CSS3 Transitions

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shim layer recomendded to get hwaccel with js fallback (isotope, yui transition, scripty2) ... or let it degrade

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CSS3 Animations

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border-image

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box-shadow

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box-reflection

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Webkit only. Dont use.

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font face

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don't use cufon. use google webfonts or fontsquirrel generator

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<input type=color>

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experimental use only

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HTML5 Form Input Validation

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background-attachment

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postMessage

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+