KeyboardEvent.metaKey

The KeyboardEvent.metaKey read-only property returning a boolean value that indicates if the Meta key was pressed (true) or not (false) when the event occurred. Some operating systems may intercept the key so it is never detected.

A boolean value

<button onclick="ismetaKey(event)">Click me with the meta key</button>

<p id="output"></p>

function ismetaKey(e) {
  document.querySelector("#output").textContent = "metaKey pressed? " + e.metaKey;
}

Result

• KeyboardEvent