The pageLeft read-only property of the VisualViewport interface returns the x coordinate of the left edge of the visual viewport relative to the initial containing block origin, in CSS pixels. 
 The pageLeft read-only property of the VisualViewport interface returns the x coordinate of the left edge of the visual viewport relative to the initial containing block origin, in CSS pixels. 
A double.
| Specification | 
|---|
| CSSOM View Module  # dom-visualviewport-pageleft  | 
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
pageLeft | 
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/pageLeft