buttonboundary
nounUK /ˈbʌtənˌbaʊndəri/
US /ˈbʌtənˌbaʊndəri/
A button boundary is the edge of a button that shows where it ends.
The button boundary was easy to see because it was a different color.
OTHER MEANINGS
2. A limit on how many buttons you can use.
The game had a button boundary of ten presses per turn.
3. A line that separates one set of buttons from another.
Draw a button boundary between the red and blue buttons.
4. The point where a button stops working.
The button boundary is where the screen stops responding.