Tempered glass is used on door, window and fixed panel for its safety features.
Tempered glass does break, so does the thicker type of tempered glass. But it breaks into many small pieces of small stones which are a bit roundish and cubic, unlike normal glass which breaks into pieces with jagged edge.
Injury sustained will not be deep as the one caused by broken normal glass with sharp, pointed edge!
How to tell or see if the glass on the fixed panel or door is tempered glass?
Look for the logo or wording "tempered" at the four corner of that piece of glass in question.
The logo "tempered" is marked blue on the photos of this post.