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Does ExtJS 4.x support HTML5 compliant web application development?
I am tasked to develop a single page application using ExtJS MVC architecture. Will such an application become automatically HTML5 compliant or do I have to take any steps to make it so?
Yes. On this page: http://www.sencha.com/products/extjs/ read the section on “Cross Platform Browser Compatibility”. If you have not done much development with the Extjs framework, one of the driving design factors behind it is to create a cross-browser/platform library that looks and feels the same no matter what environment you are using. Another of the concepts is that it utilizes HTML 5 concepts on browsers that support it and does HTML5 like things in browsers that don’t support HTML 5 using other technologies (vml in IE8, etc.). I don’t think that you’ll need to worry about compliance, especially if you are using the Extjs 4.x library.