Internet Explorer 9's support for web standards and new Javascript Engines

1. HTML5 support. IE 9 is built based on HTML5 features introduced in IE 8, and adds several notable features. The support for video and audio elements allows you to implement hardware-accelerated local video and audio content on the webpage without the need for plug-ins. Now, developers can insert audio or video as easily as they insert images. In addition, the canvas element is supported for easy dynamic image rendering, while the hardware performance can be fully realized through windows and graphics cards. In addition, the support for the selection API can program the text on the page, and the improvement of HTML parsing makes the web page more flexible.

2. Dom Levels 2 and 3. Internet Explorer 9 adds more support for the Document Object Model Level 2 (DOM l2) and level 3 (DOM l3), and improves the support for Dom L2 in the existing implementation. These added Dom features are derived from several Dom specifications, including Dom L2 and L3 core, Dom L2 views, Dom element traversal, Dom L2 and L3 events, Dom L2 HTML, Dom L2 style, Dom L2 traversal and range, and webidl (Interactive Data Language) ).

3. SVG. Since the advent of the Scalable Vector Graphics (SVG) standard, developers have been demanding direct support in IE, which IE 9 has already achieved. With support for SVG, ie 9 can achieve a rich set of detailed and eye-catching visual effects, without the need to download plug-ins separately. Like the new HTML5 media feature, SVG in IE 9 can also take full advantage of the graphic hardware acceleration feature.

4. css3. In addition to the fully compatible css2.1 (Cascading Style Sheet) of IE 8, ie 9 also supports many css3 components, it brings more flexibility and functions to network developers. IE 9 introduces features from several css3 modules, including the background and border modules, color modules, font modules, media query modules, namespace modules, selector modules, value and unit modules, and supports the Web open font format (woff ).

5. ecmascript 5. Many features of the latest ecmascript standard enhance JavaScript implementation in IE 9. The new ecmascript 5 feature helps standardize many significant improvements to the Javascript language and improves the efficiency of developers. In addition, the IE 9 Dom can support ecmascript 5 locally. When ie 9 Dom is developed using JavaScript, developers can provide consistent and natural programming modes.

6. New Dom and new JavaScript Engine. The newly optimized Document Object Model (DOM) in IE 9 interacts more efficiently with the new JavaScript Engine chakra, significantly improving the speed. By utilizing multiple CPU cores (If your Windows computer uses multi-core CPUs), chakra will explain, compile, and executeCode. The two new features are both powerful. combining them and adding hardware acceleration can make the browser run quickly.