IE9RC在Web标准支持方面取得了显著进步，尤其在HTML5、SVG、CSS3等领域的兼容性大幅提升，超越了IE8，并在多个标准上达到了100%的支持率。
IE被称为最不遵守web标准的浏览器，不过从IE9RC开始，这一状况彻底改变了。
跨浏览器测试结果对比：
| Web标准 | 测试用例数 | IE9 RC版 | Mozilla Firefox 3.6.13 | Opera 11.01 | Apple Safari 5.0.3 | Google Chrome 9.0.597.84 | IE 8 |
| 111 | 99% | 50% | 61% | 60% | 77% | 0% | |
| 70 | 100% | 76% | 94% | 84% | 89% | 0% | |
| 134 | 100% | 59% | 76% | 71% | 75% | 10% | |
| 127 | 100% | 93% | 82% | 84% | 89% | 6% | |
| 10 | 100% | 0% | 0% | 0% | 0% | 0% | |
| 77 | 100% | 49% | 40% | 35% | 36% | 0% | |
| 3413 | 100% | 47% | 47% | 86% | 89% | 6% |
| Web Standards | Number of Submitted Tests | Internet Explorer 9 RC | Mozilla Firefox 3.6.13 | Opera 11.01 | Apple Safari 5.0.3 | Google Chrome 9.0.597.84 | Internet Explorer 8 |
|---|---|---|---|---|---|---|---|
| HTML5 | 111 | 99% | 50% | 61% | 60% | 77% | 0% |
| SVG 1.1 2nd edition | 70 | 100% | 76% | 94% | 84% | 89% | 0% |
| CSS3 | 134 | 100% | 59% | 76% | 71% | 75% | 10% |
| DOM | 127 | 100% | 93% | 82% | 84% | 89% | 6% |
| Navigation Timing | 10 | 100% | 0% | 0% | 0% | 0% | 0% |
| Web Applications | 77 | 100% | 49% | 40% | 35% | 36% | 0% |
| JavaScript | 3413 | 100% | 47% | 47% | 86% | 89% | 6% |
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