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Among the usual bug fixes, Safari 5.2 Update 3 comes with a new scalable vector graphics filter, redesigned Web Inspector and HTML5 media controllers. Also included are CSS filters, Web Audio API and HTML5 timed tracks.
From the release notes:
Using SVG Filters, you can combine several filter primitive elements and light source elements into a single sophisticated filter, which can then be applied to any SVG element.
An HTML5 media controller can synchronize or otherwise coordinate the playback of multiple HTML5 media elements. For instance, you could use a media controller to overlay a sign language interpretation track over a video track, and keep the two in sync.
A media controller has the same methods and events as an HTML media element. This means that, for example, when you call the pause() method on a controller, any
media that is slaved to that controller will be paused. Or, when a controller receives a canplaythrough event, all media slaved to that controller can be played through to the end without buffering.
HTML5 timed text tracks enable captions, subtitles, descriptions, and chapters by letting you specify the timing of text that appears with an HTML5 video element.
CSS filters let you apply pixel effects to any image or web page element with a single line of code. Available filter functions include sepia, hue-rotate, saturate, invert, opacity, brightness, contrast, blur, grayscale, and drop-shadow. Filters can be combined, and changes to the filter property can be animated with CSS transitions or animations.
Web Audio API