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accumulate - SVG | MDN
Value
none
| sum
Default value
none
Animatable
No
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 attribute is ignored if the target attribute value does not support addition, or if the animation element does not repeat.
This attribute will be ignored if the animation function is specified with only the to
attribute.