I am building a website only for iPad/ tablet.  in the landing page, we are asking from users to enter a mobile number. but the client wants iPad/tab keypad should be automatic open whenever page will load. 

can anyone help how it will be open .??

my code is.

 <input  type="number" min="1" max="9999999999"  class="form-control" name="mobile_number" id="mobile_number" placeholder="Mobile Number" autofocus>

I am testing it in google chrome.

Thanks