As shown in the picture above, the html comment isn't highlighted correctly. I tried hacking through the code and I see that
html-mode seems use to the function
syntax-propertize-rules to propertize the comment, while
c-mode seems to use only the syntax-table. I think this is so because the syntax-table can't handle the
<!-- kind of comment.
So how can I customize
html-mode to make the comments highlighted by
org-mode, or customize
orb-mode to not ignore them?