GitHub pages doesn’t allow redirects using .htaccess.
I tried adding a symlink from latest/ to 0.27/.
That worked, though you need /latest/ (with the
trailing slash).
However, I reverted this experiment, because I’m
worried about broken links if people link to the
/latest/… URLs and a new version of the spec
is released. We have to balance the broken links
problem against the one extra step needed to get to
the latest version of the spec.
I’m open to ideas.