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Cannot launch keyboard using input focus via JavaScript

I am developing a web application containing formtwo elements input. One of the requirements of the user is that after inserting the character in the first one, inputit should automatically launch the focus of the next element and show the keyboard .

After a Google search seems impossible, programmatically launching the keyboard on iOS using JavaScript. The reason, however, is not entirely clear to me, some say that it is a UX function, but I can not find any official information about it.

So my question is: where can I find some official specifications that explain the technical reasons why this is not possible?

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Official specifications:

http://developer.apple.com/library/IOs/#documentation/AppleApplications/Reference/SafariWebContent/Introduction/Introduction.html#//apple_ref/doc/uid/TP40002079-SW1

Unfortunately, the official specifications will not answer your question.

Typically, with forms on iOS safari, the keyboard will remain open until the user wants to close it. When you automatically focus the next shape input, does the keyboard close?

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