How to implement h5 input box prompt + normal text box prompt

How to implement h5 input box prompt + normal text box prompt
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  1. < input   id = "username"   name = "username"   type = "text"   placeholder = "Please enter your username/phone number"   value = ""    style = "width:100%;height:32px;border-style:none" />   

placeholder="Please enter your username/phone number";

HTML5 input box prompt.

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