I'm using Gentoo Linux, XOrg 6.8.0-r4 and Enlightenment 0.16.7.2 (if that matters), and in all the web browsers I've tried, no text elements appear in the embedded frames.
For example, on
this tutorial page, all the boxes are blank. Yes, I do have an SVG plugin - I've got Adobe SVG Viewer, and every other SVG element seems to work fine.
The same thing also happens for certain Flash text elements, even though I have the latest Flash plugin installed.
I've tried Firefox, Mozilla and Opera. Same problem.