accumulate

This attribute controls whether or not the animation is cumulative.

It is frequently useful for repeated animations to build upon the previous results, accumulating with each iteration. This attribute said to the animation if the value is added to the previous animated attribute's value on each iteration.

Usage context

Categories	Animation addition attribute
Value	none \| sum
Animatable	No
Normative document	SVG 1.1 (2nd Edition)

sum: Specifies that each repeat iteration after the first builds upon the last value of the previous iteration.
none: Specifies that repeat iterations are not cumulative. This is the default.

Example

Elements

The following elements can use the additive attribute

<animate>
<animatecolor>
<animatemotion>
<animatetransform>

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