Thein attribute identifies input for the given filter primitive.

The value can be either one of the six keywords defined below, or a string which matches a previousresult attribute value within the same<filter> element. If no value is provided and this is the first filter primitive, then this filter primitive will useSourceGraphic as its input. If no value is provided and this is a subsequent filter primitive, then this filter primitive will use the result from the previous filter primitive as its input.

If the value forresult appears multiple times within a given<filter> element, then a reference to that result will use the closest preceding filter primitive with the given value for attributeresult.

You can use this attribute with the following SVG elements:

• <feBlend>
• <feColorMatrix>
• <feComponentTransfer>
• <feComposite>
• <feConvolveMatrix>
• <feDiffuseLighting>
• <feDisplacementMap>
• <feDropShadow>
• <feGaussianBlur>
• <feMergeNode>
• <feMorphology>
• <feOffset>
• <feSpecularLighting>
• <feTile>

Usage notes

SourceGraphic

This keyword represents the graphics elements that were the original input into the<filter> element.

SourceAlpha

This keyword represents the graphics elements that were the original input into the<filter> element.SourceAlpha has all of the same rules asSourceGraphic except that only the alpha channel is used.

BackgroundImage

This keyword represents an image snapshot of the SVG document under the filter region at the time that the<filter> element was invoked.

BackgroundAlpha

Same asBackgroundImage except only the alpha channel is used.

FillPaint

This keyword represents the value of thefill property on the target element for the filter effect. In many cases, theFillPaint is opaque everywhere, but that might not be the case if a shape is painted with a gradient or pattern which itself includes transparent or semi-transparent parts.

StrokePaint

This keyword represents the value of thestroke property on the target element for the filter effect. In many cases, theStrokePaint is opaque everywhere, but that might not be the case if a shape is painted with a gradient or pattern which itself includes transparent or semi-transparent parts.

<filter-primitive-reference>

This value is an assigned name for the filter primitive in the form of a<custom-ident>. If supplied, then graphics that result from processing this filter primitive can be referenced by an in attribute on a subsequent filter primitive within the same filter element. If no value is provided, the output will only be available for re-use as the implicit input into the next filter primitive if that filter primitive provides no value for its in attribute.

Workaround for BackgroundImage

BackgroundImage is not supported as a filter source in modern browsers (see thefeComposite compatibility table). We therefore need to import one of the images to blend inside the filter itself, using an<feImage> element.

HTML

<svg  xmlns="http://www.w3.org/2000/svg"  xmlns:xlink="http://www.w3.org/1999/xlink">  <defs>    <filter>      <!-- This will not work. -->      <feBlend in="BackgroundImage" in2="SourceGraphic" mode="multiply" />    </filter>  </defs>  <image    href="mdn_logo_only_color.png"    x="10%"    y="10%"    width="80%"    height="80%" />  <circle    cx="50%"    cy="40%"    r="40%"    fill="#cc0000"    filter="url(#backgroundMultiply)" /></svg><svg  xmlns="http://www.w3.org/2000/svg"  xmlns:xlink="http://www.w3.org/1999/xlink">  <defs>    <filter>      <!-- This is a workaround. -->      <feImage        href="mdn_logo_only_color.png"        x="10%"        y="10%"        width="80%"        height="80%" />      <feBlend in2="SourceGraphic" mode="multiply" />    </filter>  </defs>  <circle    cx="50%"    cy="40%"    r="40%"    fill="#cc0000"    filter="url(#imageMultiply)" /></svg>

svg {  width: 200px;  height: 200px;  display: inline;}

Result

Specifications