Purpose: Although we'd like to disable animation components for those documents that don't use animation, there's always the possibility that an animation element will be added via the DOM after the document is loaded. This test case checks that this case is not neglected. Furthermore, it ensures that timing functions as expected, that is, all times should be relative to the SVGLoad event of the document.
Operation: There is an un-animated document. After 1.5s, an
<animate> element is attached to the rectangle causing
it to move to the right.
Expected results: The box remains stationary for 1.5s and then starts moving from the middle of the viewport to the right.