Button with icon

<input id="t3-generated-1" class="t3-icon t3-icon-actions-edit t3-icon-edit-add t3-button" type="submit" value="Submit"/>

or

<button id="t3-generated-1" class="t3-icon t3-icon-actions-edit t3-icon-edit-add t3-button" type="submit">Submit</button>