The SVG <set> element provides a simple means of just setting the value of an attribute for a specified duration.
It supports all attribute types, including those that cannot reasonably be interpolated, such as string and boolean values. For attributes that can be reasonably be interpolated, the <animate> is usually preferred.
Note: The <set> element is non-additive. The additive and accumulate attributes are not allowed, and will be ignored if specified.
This attribute defines the value to be applied to the target attribute for the duration of the animation. The value must match the requirements of the target attribute. Value type: <anything>; Default value: none; Animatable: no