The offsetLeft read-only property of the VisualViewport interface returns the offset of the left edge of the visual viewport from the left edge of the layout viewport in CSS pixels. 
 The offsetLeft read-only property of the VisualViewport interface returns the offset of the left edge of the visual viewport from the left edge of the layout viewport in CSS pixels. 
A double.
| Specification | 
|---|
| CSSOM View Module  # dom-visualviewport-offsetleft  | 
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
offsetLeft | 
61 | 79 | 91 | No | 48 | 13 | 61 | 61 | 68 | 45 | 13 | 8.0 | 
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    https://developer.mozilla.org/en-US/docs/Web/API/VisualViewport/offsetLeft