What is the Simultaneous Key Test?
This page is a test that visualizes simultaneous key presses (multiple key input at once) in your browser. Pressed keys light up on the keyboard diagram, making it easy to check whether your keys are actually registering during gaming (e.g., movement + jump + crouch) or shortcut operations, and whether certain combinations are dropping.
What This Test Shows
It tallies and displays the keys currently treated as pressed based on key inputs received by the browser. What you see here is the result of inputs that reached the OS/browser. Rather than focusing on the number alone, the most useful approach is to check whether the key combinations you actually use are dropping.
How to Use
Simply press multiple keys simultaneously after opening this page. Keyboard-triggered actions such as Space, Arrows, PageUp/Down, Home/End, Backspace, and Tab that would cause scrolling, navigation, or focus changes are blocked as much as possible.
Important Notes
Since this page displays browser events, it cannot be used to definitively determine keyboard specifications as a standard. Results may also be affected by OS settings, power saving modes, app focus state, and browser state.
CapsLock (including JIS Eisu/Kana variants) is completely ignored to stabilize simultaneous key detection, as its behavior varies greatly across environments.