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.