I noticed SVG-edit, a Scalable Vector Graphics (SVG) editor that works
entirely in capable browsers [1]:

http://code.google.com/p/svg-edit/

Stable and beta demos:

http://svg-edit.googlecode.com/svn/tags/stable/editor/svg-editor.html
http://svg-edit.googlecode.com/svn/trunk/editor/svg-editor.html

Compared to Inkscape, it's quite light, but this may be an advantage.
It does appear to be actively developed.  Are there other or better
examples?

Not impossible uses in Sage:

 * Draw diagrams.
 * Annotate images.
 * Manipulate graphs.
 * Put cells anywhere.
 * Add audio and video.

Can jsMath render expressions as SVG groups?  I think this depends
partly on font support.

By the way, how about syntax highlighting for equations?  jsMath can
easily do color:

http://www.math.union.edu/~dpvc/jsMath/examples/extensions.html

Would this be useful for teaching?  I'm not sure about how to add color
attributes to symbolic variables.


[1] IE supports Vector Markup Language (VML) instead of SVG.  The svgweb
project aims to set up Flash as a non-native SVG renderer:

http://code.google.com/p/svgweb/


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