files/en-us/web/api/svgfedropshadowelement/setstddeviation/index.md
{{APIRef("SVG")}}
The setStdDeviation() method of the {{domxref("SVGFEDropShadowElement")}} interface sets the values for the {{SVGAttr("stdDeviation")}} attribute.
setStdDeviation(x, y)
x
y
None ({{jsxref('undefined')}}).
setStdDeviation()In this example, we set the horizontal and vertical standard deviations for a blur operation for a <feDropShadow> filter shadow effect using the setStdDeviation() method of the SVGFEDropShadowElement interface.
<svg height="200" width="200" viewBox="0 0 200 200">
<defs>
<filter id="drop-shadow-filter">
<feDropShadow
in="SourceGraphic"
dx="10"
dy="10"
stdDeviation="5 5"
flood-color="gray" />
</filter>
</defs>
<!-- Rectangle with an initial gray shadow -->
<rect
x="50"
y="50"
width="100"
height="100"
fill="red"
filter="url(#drop-shadow-filter)" />
</svg>
<!-- Button to update the shadow -->
<button id="updateShadow" type="button">Update Shadow</button>
// Get the feDropShadow element
const dropShadow = document.querySelector("feDropShadow");
// Button to trigger the update
document.getElementById("updateShadow").addEventListener("click", () => {
// Change the standard deviation (blur radius) of the shadow
dropShadow.setStdDeviation(15, 20);
});
{{EmbedLiveSample("Examples", "", "240")}}
Click on the red rectangle to update the drop shadow's blur effect.
{{Specifications}}
{{Compat}}