Unlike Flash or Silverlight, which are presentational and therefore deliver a fixed view for users to experience, the Web’s native HTML only describes content semantically, so users and their browser can interpret how they want to experience that information.
HTML supports flexible presentation using CSS (Cascading Style Sheets), a technology that can scale Web content and complexity to accommodate the limitation of mobile devices, accessibility issues for the blind or physically impaired, or simply customize information presentation to fit the desires of Web users.
Morgan Adams, an interactive content developer with a lot of experience with Flash recently explained that most of today’s existing Flash-based games, navigation elements, and other content is oriented toward mouse-centric desktop and simply can not work well in a multitouch environment like the iPhone or Apple’s upcoming iPad, where there is no mouseover.
Adobe is working to push out new enhancements to Flash to accommodate touch-centric environments in new content, but developers have to weigh whether sticking with Adobe’s platform makes sense now that HTML5 delivers much of the functionality of Flash without dependance upon Adobe. Apple’s staunchly Flash-free mobile platforms are helping to tilt that decision in favor of open standards.
via AppleInsider.
Read also my own article on that topic.