Microsoft released a second "platform preview" version of Internet Explorer 9 on Wednesday with faster JavaScript and better Web standards compliance--plus an argument for how future Web technology should develop.
Central to the second IE9 preview (download) is progress toward matching rivals in SunSpider, a speed test of Web-based JavaScript programs, and Acid3, a test of adherence to some Web technologies. On the first, Microsoft improved from 590 to 473 milliseconds; on the second, from 55 to 68 out of a possible 100. But there's more to the story than benchmarks.