A notification count on an icon in HTML & CSS
HTML & CSS interview exercise on Positioning & stacking, difficulty 1 of 3. Solve it in the editor beside a worked example; the tests run the moment you do.
The bell is a 40px square button. Put the count in a small round badge whose centre sits on the button's top-right corner (half outside), with the badge on top of the icon. The button itself must not grow.
Each exercise pairs a worked example with a twin problem to solve in a real editor; the tests run the moment you do. Progress is saved in your browser, and in your account if you sign in.