The KeyboardEvent.metaKey read-only property returning a Boolean 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.
Note: On Macintosh keyboards, this is the ⌘ Command key. On Windows keyboards, this is the Windows key (⊞ Windows).
At least as of Firefox 48, the ⊞ Windows key is not considered the "Meta" key. KeyboardEvent.metaKey is false when the ⊞ Windows is pressed.
var metaKeyPressed = instanceOfKeyboardEvent.metaKey
A boolean
function ismetaKey(e) {
alert("metaKey = " + e.metaKey);
}
<button onclick="ismetaKey(event)">Click me with the meta key</button>
| Specification | Status | Comment |
|---|---|---|
| Document Object Model (DOM) Level 3 Events Specification The definition of 'KeyboardEvent.metaKey' in that specification. | Obsolete | Initial definition |
| Feature | Edge | Firefox (Gecko) | Chrome | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
| Feature | Edge | Firefox Mobile (Gecko) | Android | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | (Yes) | ? | ? | ? | ? | ? |
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https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/metaKey