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html5 (page under construction - still you may find it very useful.)
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Intro ------------------------------

You need modern browser to see html5 at work. html5 is supported by IE9 (need Windows 7), Firefox 3.5+, Opera, Google Chrome, Safari

HTML5 allows to play video and audio (using <video> and <audio> tags), to draw and create animations (using <canvas> tag), thus effectively eliminating the need in flash/actionscript/flex programming. Here is a list of some new features:

@font-face allows to download fonts which are not available on viewer's machine
canvas dynamic, scriptable rendering of 2D shapes and bitmap images
canvas text drawing/formatting text on a canvas
html5 audio play audio
html5 video play video
rgba() define colours in CSS3 using an Alpha channel (opacity/transparency), for example: background-color: rgba(255,0,0,1);
hsla() similar to rgba(), but different way to specify colors (Hue, Saturation, Lightness)
border-image allows to create beautiful borders, buttons
border-radius rounded corners
multiple backgrounds  
css animations  
css columns text goes in columns
css gradients  
css reflections  
css 2D transforms for example, transform rotate can rotate text at arbitrary angle
css 3D transforms  
css transitions transitions of images or text, including duration, timing functions, etc.
geolocation API scripted access to geographical info