Adding attributes to HTML tags in Contact Form 7 [closed]

You can use a tel shortcode to do this:

[tel* id:field-mobile 10/10 "placeholder text"]

This brings up the issue of browser support; if the browser in use does not support the tel input type, it will fall back to a plain text field.

Source: http://contactform7.com/text-fields/ (halfway down the page)

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