Show "Search" button on mobile keyboard

For Android

Only type="search" is required on <input>

For IOS

It is required to wrap <input type="search"> inside a <form action>, note that the attribute action is must-have.

For all mobile devices

To sum up, the minimum requirement on mobile is:

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<form action>
  <input
    type="search"
  >
</form>

To try on mobile device, here is a live example on JSFiddle :