"on" popup when hovering

[vini2001]

When hovering a star that doesn't have a title, it will show an "on" popup

[fyneworks]

The title of each star image is the value of the input.

If you do this:
<input type="radio" value="on"
...then it will show title "on".

This isn't a bug, it's the desired behaviour.

Please submit code sample if you believe this is incorrect.