This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The currentScale property of the SVGSVGElement interface reflects the current scale factor relative to the initial view to take into account user magnification and panning operations on the outermost <svg> element.
DOM attributes currentScale and currentTranslate are equivalent to the 2×3 matrix [a b c d e f] = [currentScale 0 0 currentScale currentTranslate.x currentTranslate.y]. If "magnification" is enabled (i.e., zoomAndPan="magnify"), then the effect is as if an extra transformation were placed at the outermost level on the SVG document fragment (i.e., outside the outermost <svg> element).
If the <svg> element is not at the outermost level, then currentScale is always 1 and setting it has no effect.
A float.
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
currentScale |
1 | 12 | 1.5 | ≤12.1 | 3 | 18 | 4 | ≤12.1 | 1 | 1.0 | 3 | 1 |
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https://developer.mozilla.org/en-US/docs/Web/API/SVGSVGElement/currentScale