What is callback function ?
A callback function also known as a higher-order function is, a function that is passed to another function as a parameter, and the callback function is called inside the other function.
Input type date default placehoder change
<input id="my_date" name="my_date" class="form-control" placeholder="My Date" type="text" onfocus="(this.type='date')" onblur="(this.type='text')">
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