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in2

The in2 attribute identifies the second input for the given filter primitive. It works exactly like the in attribute.

Three elements use this attribute: <feBlend>, <feComposite> and <feDisplacementMap>.

feBlend

For <feBlend>, in2 defines the second input image to the blending operation.

Value SourceGraphic | SourceAlpha | BackgroundImage | BackgroundAlpha | FillPaint | StrokePaint | <filter-primitive-reference>
Default value SourceGraphic for first filter primitive, otherwise result of previous filter primitive
Animatable Yes

feComposite

For <feComposite>, in2 defines the second input image to the compositing operation.

Value SourceGraphic | SourceAlpha | BackgroundImage | BackgroundAlpha | FillPaint | StrokePaint | <filter-primitive-reference>
Default value SourceGraphic for first filter primitive, otherwise result of previous filter primitive
Animatable Yes

feDisplacementMap

For <feDisplacementMap>, in2 defines the second input image, which is used to displace the pixels in the image defined in the in attribute.

Value SourceGraphic | SourceAlpha | BackgroundImage | BackgroundAlpha | FillPaint | StrokePaint | <filter-primitive-reference>
Default value SourceGraphic for first filter primitive, otherwise result of previous filter primitive
Animatable Yes

Specifications

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https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/in2