Safari Tabindex

By default, Safari ignores the pressing of the tab button on the keyboard to follow the tab index of fields, specifically on checkbox and radio button fields.

Here is a video to show the problem: http://screencast.com/t/BsoIZ1Kz

You can fix this by going to Safari Preferences > Advanced > Press Tab…
Here is a screenshot to show you how:

And here is a video to show the result: http://screencast.com/t/Ye6yhmK7