Internet Explorer 10 Platform Preview 4 is now available for download and testing. This IE10 preview 4 adds more support for HTML5 technologies.
Cross-Origin Resource Sharing (CORS) for safe use of XMLHttpRequest across domains.
File API Writer support for blobBuilder allowing manipulation of large binary objects in script in the browser.
Support for JavaScript typed arrays for efficient storage and manipulation of typed data.
CSS user-select property to control how end-users select elements in a Web page or application.
Support for HTML5 video text captioning, including time-code, placement, and captioning file formats
Internet Explorer 10 Platform Preview 4
