Issue-131

Here are the files for changes to address the addition of a text baseline
for canvas

(See attached file: diff.txt)(See attached file:
canvasissue131textbaseline.html)

I need these for reference in the change proposal I am about to submit to
the canvas accessibility sub team to reopen issue 131 before the holiday.
The change proposal will follow.

Rich Schwerdtfeger
CTO Accessibility Software Group