in2

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

Usage context

Categories	None
Value	`SourceGraphic` \| `SourceAlpha` \| `BackgroundImage` \| `BackgroundAlpha` \| `FillPaint` \| `StrokePaint` \| <filter-primitive-reference>
Animatable	Yes
Normative document	SVG 1.1 (2nd Edition) : feBlend SVG 1.1 (2nd Edition) : feComposite SVG 1.1 (2nd Edition) : feDisplacementMap

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 as SourceGraphic 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 as BackgroundImage except only the alpha channel is used.
FillPaint: This keyword represents the value of the fill property on the target element for the filter effect. In many cases, the FillPaint is opaque everywhere, but it might not be the case if a shape is paint with a gradient or pattern which itself includes transparent or semi-transparent parts.
StrokePaint: This keyword represents the value of the stroke property on the target element for the filter effect. In many cases, the StrokePaint is opaque everywhere, but it might not be the case if a shape is paint with a gradient or pattern which itself includes transparent or semi-transparent parts.

The following elements can use the in2 attribute