Microsoft has released fourth platform preview of IE 10. It is specially released for developers. Many HTML 5 improvements have been done. This preview release includes support for major platform features like HTML5 Parser, HTML5 Sandbox, Web Workers, HTML5 Forms, Media Query Listerners and more. Some of other features are:
- 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.
- 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.
This only works with Windows 8 Developer Preview.