The button element (<button>...</button>) was introduced to allow users more control over how their buttons appear.
This element also allows other elements to appear inside the button (between the tags). This means you can combine text and images between the button tags.
<form action="http://www.example.com/add.php">
<button>
<img src="images/chihuahua.jpg" alt="add" width="60" height="40" />
Add
</button>
</form>