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Chrome runs as close as any browser can to the bleeding edge of Web standards. Though it uses the same open source WebKit rendering engine as Safari, it doesn't reliably support the controversial, proprietary CSS3 transformation and animation tricks that Apple's built into Safari. However, like every browser I tested, it earned a perfect score in a compatibility test for CSS3 selectors, and it joined Safari and Opera with a flawless score of 100 in the Acid3 web standards benchmark. Chrome 5 also supports both Apple's H.264 codec and Mozilla's preferred open source Ogg Theora technology for plugin-free HTML5 video, and it beautifully played back HTML5 demo videos from YouTube and Brightcove. In XHTML and CSS tests, Chrome was surprisingly slower than Safari, despite their shared rendering engine -- but the race was close. Safari rendered a local XHTML test page in 0.58 seconds to Chrome's 0.78 seconds, and a local CSS test page in 33 milliseconds to Chrome's 51 milliseconds. Note that Chrome still rendered XHTML more than twice as fast as Opera (1.67 seconds) and left Firefox (12.42 seconds--no, that's not a typo) eating its dust. In CSS, it also beat the pants off Opera (193 milliseconds) and Firefox (342 milliseconds). But Chrome shines brightest when handling JavaScript. Its V8 engine zipped through the SunSpider Javascript benchmark in 448.6 milliseconds, narrowly beating Opera's 485.8 milliseconds, and absolutely plastering Firefox's 1,161.4 milliseconds. However, Safari 5's time of 376.3 miliseconds in the SunSpider test beat Chrome 5 handily.

H.264, Ogg Theora, MP4, Xvid, MKV, FLV: The world of online video can be pretty confusing. Not only are there tons of different formats and acronyms, but various devices and services actually have vastly different requirements. A video you downloaded via BitTorrent most likely won't play on your iPhone, and the software that comes with your Flip camera won't be of much use to prepare an upload for Wikipedia. Tools to convert videos have been out for a while, but many of them used to be fairly complex, asking for detailed settings about bit rates, audio codecs and interlacing. However, there have been a number of new applications released in the last couple of months that make converting and even transfering clips and movies between devices much easier. Here are five great free tools to check out: Miro Video Converter - free, supports Google V8 DivX Plus RealPlayer DoubleTwist - 200 compatible devices Vuze - free bittorrent client also converts video files

Separately, Microsoft and Apple have announced that both company's browsers will boycott VP8 in favor of H264, which is encumbered by more than a thousand patents.. But if VP8 becomes ubiquitous on the Web, that's a hard position to maintain.  

Kurt Cagle digs into audio and video support in HTML 5. As always, his view is revealing.