UI elements written in HTML are hella buggy. For example, Chrome's hamburger menu (I don't know if it's written in HTML but it sure feels like it):
1. Spacebar doesn't select items
2. Key equivalents don't work while it's open
3. Cut/Copy/Paste often does not work, depending on where the keyboard focus is
4. Inapplicable menu items don't disable properly
5. The caret continues blinking in text fields even though keyboard focus is in the menu
etc etc. This sort of basic bugginess is embarrassing and entirely avoidable by using the native platform controls, instead of re-inventing them poorly.
1. Spacebar doesn't select items
2. Key equivalents don't work while it's open
3. Cut/Copy/Paste often does not work, depending on where the keyboard focus is
4. Inapplicable menu items don't disable properly
5. The caret continues blinking in text fields even though keyboard focus is in the menu
etc etc. This sort of basic bugginess is embarrassing and entirely avoidable by using the native platform controls, instead of re-inventing them poorly.