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MP3 MP3 is the most popular format and it's supported by most of phones, including Android, Windows Phone, Symbian... iPhone? m4r iPhone apparently uses another format, M4R, as I understand it's just a regular iTunes AAC with a different extension. It's very easy to convert an MP3 to iPhone ringtone. see this What to do You can either add two ...

I don't think I've ever seen an official listing of versions, so you'll have to piece things together a little. For your immediate question, there's a page in the Safari Web Content Guide that uses the 3.2 UserAgent string as an example, and gives it as "Mozilla/5.0 (iPad; U; CPU OS 3_2 like Mac OS X; en-us) AppleWebKit/531.21.10 (KHTML, like Gecko) ...

16x16 is still best practice, this isn't something that is likely to change soon. To answer your second question; Mobile devices that try and include an image for a bookmark or website generally use the favicon. I can't speak for them all but certainly the ones you mentioned there don't have any special icon type or setting.

Honestly I would avoid using them new html5 tags like head, section, article etc.. They're definitions are just so vague and unclear, and nobody (including the guy that thought of them) really knows how to use them. Here is a link to an interesting article on that topic:.NET article And if you dont want to read it here is one sentence summary: Stick ...

I can't speak for Android but a quick search would seem to suggest it's handled by an app or free reader app rather than the browser. The iPhone opens PDF's on the fly in Safari and if you save them it saves them in iBook. You don't have to do anything special to achieve this just link to the PDF as you normally would.