This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.
The in1 read-only property of the SVGFEDropShadowElement interface reflects the in attribute of the given <feDropShadow> element.
An SVGAnimatedString object.
In this example, two <feDropShadow> elements are defined in a filter, each with a different in attribute.
<svg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg">
<defs>
<filter id="drop-shadow-filter">
<!-- First Drop Shadow applied to the SourceGraphic -->
<feDropShadow
in="SourceGraphic"
dx="10"
dy="10"
stdDeviation="5"
flood-color="red" />
<!-- Second Drop Shadow applied to the BackgroundImage -->
<feDropShadow
in="BackgroundImage"
dx="-10"
dy="-10"
stdDeviation="5"
flood-color="blue" />
</filter>
</defs>
<!-- Rectangle with red shadow -->
<rect
x="20"
y="20"
width="100"
height="100"
fill="red"
filter="url(#drop-shadow-filter)" />
<!-- Circle with blue shadow -->
<circle
cx="100"
cy="100"
r="50"
fill="blue"
filter="url(#drop-shadow-filter)" />
</svg>
We can access the in attribute:
const dropShadows = document.querySelectorAll("feDropShadow");
console.log(dropShadows[0].in1.baseVal); // Output: "SourceGraphic"
console.log(dropShadows[1].in1.baseVal); // Output: "BackgroundImage"
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
in1 |
13 | 79 | 30 | 15 | 6 | 18 | 30 | 14 | 6 | 1.0 | 4.4 | 6 |
© 2005–2025 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/SVGFEDropShadowElement/in1