This feature is well established and works across many devices and browser versions. It’s been available across browsers since December 2015.
The offsetX read-only property of the MouseEvent interface provides the offset in the X coordinate of the mouse pointer between that event and the padding edge of the target node.
A double floating point value in pixels.
Early versions of the spec defined this as an integer.
| Specification |
|---|
| CSSOM View Module> # dom-mouseevent-offsetx> |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
offsetX |
1 | 12 | 39 | ≤12.1 | 1 | 18 | 43 | ≤12.1 | 1 | 1.0 | 4.4 | 1 |
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https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/offsetX