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When a textarea receives focus on iOS, the focus style is not applied. That is, there is no outline showing that the textarea has focus.
Note that a regular textbox (e.g., input type="text") correctly shows the focus style. Also, on other platforms (such as Android), a textarea correctly shows the focus style.
As a test page, see the standard demo page:
Try the "Textarea" example.
This was tested on iOS 6.1.3 and iOS 7.0.3.
This has since been fixed closing.