This is particularly true for mobile devices. A de facto requirement for any modern mobile operating system is the inclusion of a modern HTML5-compliant web browser. The leading modern mobile platforms — iOS and Android — both use WebKit as their bases. Likewise, BlackBerry and HP/Palm are also using WebKit and Microsoft is going to release a mobile version of Internet Explorer 9 for Windows Phone 7.
What this means is that out of the box, modern smartphones and tablets support the bells and whistles that make HTML5 so special. It also means that developers can feel free to use those technologies when creating their applications and not have to worry that the device itself won't support a particular function.
It also means that developers that choose to create HTML5 web apps for the desktop — like for the Google Chrome Web Store — can often use the same code when crafting an app for the iPad or for other tablets.
Earlier this month, leading iOS developer ScrollMotion released its first simultaneous e-book for the iPad and Chrome Web Store.
Because ScrollMotion has built its underlying app platform in HTML5, porting the content to a non-iOS device, like the Chrome browser, required very little work.