CatBus said:
The safe areas are ill-defined these days
Pretty much every video, DVD, compositing and 3D software I've worked with during the last 15 or so years used the 5%/10% guides, so I'm pretty sure that's the most common ratio for them.
Harmy said:
People with that amount of over-scan should really throw their TVs away.
You might be reading the chart wrong though ;) Only stuff outside the "Action Safe" frame might get cropped off... sometimes only half of it. But when it happens, text outside the "Title Safe" frame would be too close to the edge of the screen to look aesthetically pleasing, so it's advised to only position text inside the "Title Safe" frame.