Microsoft has released a new Internet Explorer 10 preview, the second pre-release of Internet Explorer 10 designed to give developers access to the new technologies that Internet Explorer 10 will deliver. The new version includes support for a bunch of new specifications, enabling better support for drag and drop, form validation, positioning of page elements, and more. As with prior preview releases, Microsoft has also provided a number of demo sites to show off new capabilities, and new test cases to demonstrate exact conformance with the HTML5 specifications.
This update comes 11 weeks after the first preview release, making it a little ahead of schedule; Internet Explorer 9 previews came out roughly every eight weeks, but for Internet Explorer 10, Microsoft is aiming at one every three months.
Probably the most significant inclusion for Web developers is support for the Web Worker API. Conventionally, browser JavaScript has been strictly single-threaded, with no facility to perform computations in the background or use multicore processors. Web Workers change this, by allowing multiple scripts to execute simultaneously, opening the door to pages that are both more responsive and contain more complex scripting than is possible without Web Workers.
Test drive of this shown as shown in below pic.
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