This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.
The width read-only property of the SVGFEDropShadowElement interface describes the horizontal size of an SVG filter primitive as a SVGAnimatedLength.
It reflects the width filter primitive attribute. The attribute is a <length> or a <percentage> relative to the width of the filter region. The default value is 100%. The property value is a length in user coordinate system units.
const feDropShadow = document.querySelector("feDropShadow");
const horizontalSize = feDropShadow.width;
console.log(horizontalSize.baseVal.value); // the `width` value
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
width |
13 | 79 | 30 | 15 | 6 | 18 | 30 | 14 | 6 | 1.0 | 4.4 | 6 |
SVGFEDropShadowElement.heightdrop-shadow() functionbox-shadow propertytext-shadow property<blend-mode> data typemix-blend-mode property
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https://developer.mozilla.org/en-US/docs/Web/API/SVGFEDropShadowElement/width