<tspan> element not implemented http://www.w3.org/TR/SVG/text.html#TSpanElement This is by far the most important piece of text left. For better or worse it shares all of its attributes with <text>. <text> in my view should have only <tspan> children, making implicit <tspan>s for any plain text node children.
*** Bug 6483 has been marked as a duplicate of this bug. ***
*** Bug 6477 has been marked as a duplicate of this bug. ***
Created attachment 5691 [details] proposed patch.