When i try to apply data-icon= to the button, for example a href="index.html" data-role="button" data-icon="delete">Delete</a> it doesn't work... I am pretty sure that it used to work some day ago but now i can't manage to display any icon on the button. In addition also data-iconpos="notext" doesn't and it display always the text... I don't know what can i do coz' i tried to delete all my project and start again but the problem persists so i decided to make this simple page that shows the problem.

Thanks in advice!

Edit: Also if you try to click on delete button you will see that also auto-generated buttons, as "back" doesn't have the arrow-l icon...