When animation SVG text from JavaScript, it shows repainting issues. Attaching testcase for Oliver.
Created attachment 11922 [details] Testcase Setting the viewBox="" attribute on the <svg> also results in funny drawing bugs. Play around with it :-)
The viewBox bugs are known. I just filed bug 11907 to track those. I assume the text just isn't invalidating here after changing the transform. It looks like SVGTextElement::updateLocalTransform is supposed to do just that though. So possibly the layout is not causing the proper repaint to occur.
Fixed by bug 11984. *** This bug has been marked as a duplicate of 11984 ***