Well I found the reason - it's in theme css
html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, font, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead, tr, th, td {
margin: 0;
padding: 0;
border: 0;
outline: 0;
font-weight: inherit;
font-style: inherit;
font-size: 100%;
font-family: inherit;
background-image: none;
}
/* IEs break with vertical-align: baseline on images */
/* set different vertiacal-align for tr, th, td for Moodle */
html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, font, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
table, caption, tbody, tfoot, thead {
vertical-align: baseline;
}
should not be used for sub and sup. The former code sets font size to 100% and the latter sets vertical-align to baseline which breaks supscript and superscript...
Bug
Resolved
Minor
Mauno, thanks for your report.
I guess this is a theme issue, as I don't remember there being a problem with the old moodle.org theme.
Reassigning to Martin for consideration.