Questions
What is a good spacebar speed?
Pressing with one thumb, most people reach about 5 to 8 presses per second. Alternating two fingers can take you above 10.
Does holding the space bar count?
No. Only separate presses count. A keyboard repeats a held key on its own, and those repeats are ignored.
Can I use it on a phone?
Yes. Tap the dark area on the screen. A connected keyboard works too.
Why doesn't every press register?
Some keyboards miss very fast presses, especially worn or wireless ones. Also make sure the page has focus: click it once before you start.