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1.Standards Compliance
The Microsoft IE 9 (http://windows.microsoft.com/en-US/internet-explorer/products/ie-9/home) team submitted tests for various Web specs that are either unratified or in transition. Their focus has been to seek compliance with HTML5, SVG 1.1, CSS 3.0, ECMAScript 5 and DOM L2 and L3 specs. Microsoft officials say that developers only have to write their code once and it will run across all browsers.
2.Hardware Accelerated Graphics
IE 9 (http://windows.microsoft.com/en-US/internet-explorer/products/ie-9/home) can power HTML5-coded audio and video using the device's underlying hardware. Multimedia can run natively in IE 9 (http://windows.microsoft.com/en-US/internet-explorer/products/ie-9/home) without relying on add-ons such as Flash or Silverlight.IE 9 (http://windows.microsoft.com/en-US/internet-explorer/products/ie-9/home) taps into the device's graphics processing unit (GPU) to optimize performance.
3.Google UI
The new Microsoft browser adopts the "popular sites" opening screen seen in Google Chrome. IE 9 (http://windows.microsoft.com/en-US/internet-explorer/products/ie-9/home) also lets users search the Web using the address bar (or "One Box," as Microsoft terms it) of the browser, a feature seen in Google Chrome.
4.Windows UI
Features introduced in Windows 7 (http://i55.tinypic.com/k16jkl.jpg) and Windows Vista (http://i52.tinypic.com/s0vq85.jpg) can be seen in IE 9 (http://windows.microsoft.com/en-US/internet-explorer/products/ie-9/home), such as the ability to pin Web sites to the taskbar as if they were applications. Developers can associate "jumplists" (a Windows term for a series of links) with pinned sites to facilitate navigation.
5.Chakra!
Let's face it, IE 8 (http://i56.tinypic.com/4t4oyq.jpg) is slow. IE 9 (http://windows.microsoft.com/en-US/internet-explorer/products/ie-9/home) uses a new JavaScript engine called "Chakra" to speed performance. Chakra is capable of taking advantage of multi-core hardware.
6.Architecture
The IE 9 (http://windows.microsoft.com/en-US/internet-explorer/products/ie-9/home) team moved the processing of JavaScript closer to the Document Object Model (DOM) in the IE 9 beta (http://windows.microsoft.com/en-US/internet-explorer/products/ie-9/home), which has resulted in speed improvements. Microsoft tests show that IE 9 (http://windows.microsoft.com/en-US/internet-explorer/products/ie-9/home) equals or surpasses competing browsers in terms of speed.
7.Performance Advice
Microsoft included an "add-on performance advisor" in IE 9 (http://windows.microsoft.com/en-US/internet-explorer/products/ie-9/home) that tells users when third-party additions are slowing the browser's performance.
8.Better Security for Downloads
IE 9 (http://windows.microsoft.com/en-US/internet-explorer/products/ie-9/home) includes a new download manager that uses the Microsoft "smartscreen filter" to alert users when a download originates from an unfamiliar or untrusted source.
9.Tab Isolation
Microsoft claims that tab isolation is a new feature in IE 9 (http://windows.microsoft.com/en-US/internet-explorer/products/ie-9/home). It provides for automatic crash recovery and hang recovery when Web sites fail.
10.Management and Dev Features
Hitting the F12 (http://i56.tinypic.com/of3gc6.jpg) key lets Web developers debug their code or check performance issues. Developers can control how their Web sites appear by falling back to earlier Internet Explorer versions using IE 9 (http://windows.microsoft.com/en-US/internet-explorer/products/ie-9/home) compatibility-mode settings. IT pros can set Group Policy for IE 9 (http://windows.microsoft.com/en-US/internet-explorer/products/ie-9/home), with more than 1,500 options, including control over browser add-ons. IE 9 (http://windows.microsoft.com/en-US/internet-explorer/products/ie-9/home) will support slipstream installations, allowing IT pros to include updates in distributions.