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---
title: k3
slug: Web/SVG/Attribute/k3
page-type: svg-attribute
browser-compat: svg.elements.feComposite.k3
---
{{SVGRef}}
The **`k3`** attribute defines one of the values to be used within the `arithmetic` operation of the {{SVGElement("feComposite")}} filter primitive.
The pixel composition is computed using the following formula:
```js
result = k1 * i1 * i2 + k2 * i1 + k3 * i2 + k4;
```
You can use this attribute with the following SVG elements:
- {{SVGElement("feComposite")}}
## Example
```css hidden
html,
body,
svg {
height: 100%;
}
```
```html
<svg viewBox="0 0 420 200" xmlns="http://www.w3.org/2000/svg">
<filter id="composite1" x="0" y="0" width="100%" height="100%">
<feComposite
in2="SourceGraphic"
operator="arithmetic"
k1="1"
k2="0"
k3="1"
k4="0" />
</filter>
<filter id="composite2" x="0" y="0" width="100%" height="100%">
<feComposite
in2="SourceGraphic"
operator="arithmetic"
k1="1"
k2="0"
k3="10"
k4="0" />
</filter>
<image
href="mdn.svg"
x="0"
y="0"
width="200"
height="200"
style="filter: url(#composite1);" />
<image
href="mdn.svg"
x="0"
y="0"
width="200"
height="200"
style="filter: url(#composite2); transform: translateX(220px);" />
</svg>
```
{{EmbedLiveSample("Example", "420", "200")}}
## Usage notes
<table class="properties">
<tbody>
<tr>
<th scope="row">Value</th>
<td>{{cssxref("number")}}</td>
</tr>
<tr>
<th scope="row">Default value</th>
<td><code>0</code></td>
</tr>
<tr>
<th scope="row">Animatable</th>
<td>Yes</td>
</tr>
</tbody>
</table>
## Specifications
{{Specifications}}
## Browser compatibility
{{Compat}}