The table lists some common HTML Custom Characters (far from the complete list) which work in Mozilla (Firefox) and whether they typically display in Internet Explorer. To be sure please check this page in Internet Explorer. If you are getting different results please email me feedback at bobm@dottedi.biz. If you are getting different results on a Mac running Safari let me know and I'll add a column with this info.
No by omission - if there is a line that shows nothing in IE other than a couple square brackets or a square box, assume no by omission.