To create the best designs for the iPhone, iPad, and iPod touch, use JavaScript to enhance CSS 3 features, add interactive messages, and even create complex games and web applications. The relatively simple programming language JavaScript runs within a web browser.
Adobe Flash has been a popular video and animation tool for more than a decade. Flash makes it easy to animate images and text. The interface in the Flash development tool is set up for designers to quickly create and animate ideas that convey a deeper meaning than static images.
Flash is also a great way to add fun little effects, create games, and play video. Many new forms of entertainment have been created and distributed through Flash. Unfortunately, none of the iOS devices (including the iPhone, iPad, and iPod touch) support Flash. If your site uses Flash and someone visits your pages with one of these devices, the visitor sees nothing. Nada. Zilch.
For your website to display on the iPhone, iPad, and iPod touch, you should re-create your Flash animations and other interactive features by using HTML5, CSS 3, and JavaScript. Here are a few additional advantages of replacing Flash content on your sites:
You experience better search engine optimization. Although Google has gotten better over the years, it still doesn’t search through Flash files for information as effectively as it does through content formatted with HTML and CSS.
Download speeds are faster. Animations designed in Flash are generally larger than the equivalent animations designed in HTML5, CSS, and JavaScript.
Interactive features don’t require plug-ins. Animations and other interactive features created with CSS and JavaScript run in the Apple iOS without requiring a plug-in, which means that they run faster and smoother.
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Source:http://www.dummies.com/how-to/content/replace-flash-with-html5-css-and-javascript.html
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