Making 'file' input element mandatory (required)

Question

I want to make (an HTML) \'file\' input element mandatory: something like

But it i

Answer 1

As of now in 2017, I am able to do this-

<input type='file' required />

and when you submit the form, it asks for file.

Answer 2

Thanks to HTML5, it is as easy as this:

<input type='file' required />

Example:

<form>
  <input type='file' required />
  <button type="submit"> Submit </button>
</form>