[LON-CAPA-users] Chemistry again - equilibrium symbol
Guy Albertelli II
lon-capa-users@mail.lon-capa.org
Tue, 24 May 2005 15:39:29 -0400 (EDT)
Hi Mark,
> Matt is fishing around for an option for the symbol for equilibrium under
> html.
>
> Is there an html equivalent to \rightleftharpoon in tex?
No, but there is a unicode equivalent so if you have UTF-8 encoded
document you can use the unicode symbol reference ⇌
(I am pretty sure IE 6's unicode font set doesn't include this
particular symbol.)
In Lon-CAPA's chemparse we do:
if ($external::target eq 'web' && &EXT('request.browser.unicode')) {
$formula .= '⇌ ';
} else {
$formula .= &web('<=>','<m>\ensuremath{\rightleftharpoons}</m> ',
'<=>');
}
which mean, if it's a unicode capable brower output the ⇌
Otherwise in html do <=> and in text do <m>\ensuremath{\rightleftharpoons}</m>
BTW here is the unicode set of arrows:
http://www.unicode.org/charts/PDF/U2190.pdf
--
guy@albertelli.com LON-CAPA Developer 0-7-2-6-