| MXML | XAML | XUL
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| Here today | 2006? 2007? | Here today and battle tested.
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| Runs anywhere Flash Player 7 runs | Runs only on Longhorn | Runs on any platform. Runtime smaller than .Net.
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| Server required | Server not required | Server Not Required
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| Uses ActionScript 2.0 | Uses .NET languages | Javascript, Python, C++
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| XPath support: no | XPath support: yes | XPath support: yes |
| CSS support: limited | CSS support: no | CSS Support: excellent.
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