Ok, I've been poking around the forums, found out how to get new allowed tags (thanks to Louise Dade + others) and now want to add MathML tag support, so users can post MathML.
A big problem is that the editor box seems to add line break <br /> tags to every line - how do you turn this off?
The array I'm using in the plugin is:
`$tags = array(
// XHTML elements:
'a' => array(
'href' => array(),
'hreflang' => array(),
'title' => array(),
'rel' => array(),
'xml:lang' => array()),
'abbr' => array('title' => array()),
'acronym' => array('title' => array()),
'b' => array(),
'bdo' => array(
'dir' => array(),
'xml:lang' => array()),
'blockquote' => array('cite' => array()),
'br' => array(),
'code' => array(),
// 'del' => array('datetime' => array()),
'dd' => array(),
'dl' => array(),
'div' => array(
'dir' => array(),
'xml:lang' => array()),
'dt' => array(),
'em' => array(),
'i' => array(
'dir' => array(),
'xml:lang' => array()),
// 'ins' => array('datetime' => array(), 'cite' => array()),
'li' => array(),
'ol' => array(),
'p' => array(),
'pre' => array(),
// 'q' => array(),
// 'strike' => array(),
'span' => array(
'dir' => array(),
'xml:lang' => array()),
'strong' => array(),
'sub' => array(),
'sup' => array(),
'u' => array(),
'ul' => array(),
// MathML elements:
'math' => array(
'xmlns' => array(),
'mode' => array()),
'mo' => array(
'lspace' => array(),
'rspace' => array(),
'fence' => array(),
'separator' => array()),
'mi' => array('mathvariant' => array()),
'msub' => array(),
'msup' => array(),
'msubsup' => array(),
'mfrac' => array('linethickness' => array()),
'mn' => array(),
'mstyle' => array(
'scriptlevel' => array(),
'fontstyle' => array(),
'fontweight' => array(),
'mathvariant' => array(),
'displaystyle' => array()),
'mtext' => array(),
'mspace' => array(
'width' => array(),
'height' => array(),
'depth' => array()),
'msqrt' => array(),
'mmultiscripts' => array(),
'mprescripts' => array(),
'none' => array(),
'mroot' => array(),
'mphantom' => array(),
'merror' => array(),
'mover' => array(),
'munder' => array(),
'munderover' => array(),
'maction' => array(
'actiontype' => array(),
'other' => array(),
'selection' => array()),
'mtable' => array(
'align' => array(),
'columnalign' => array(),
'rowalign' => array(),
'equalrows' => array(),
'equalcolumns' => array(),
'columnspacing' => array(),
'rowspacing' => array(),
'columnlines' => array(),
'rowlines' => array(),
'frame' => array()),
'mrow' => array(
'xlink:type' => array(),
'xlink:show' => array(),
'xlink:href' => array()),
'mtr' => array(
'rowalign' => array(),
'columnalign' => array()),
'mtd' => array(
'rowspan' => array(),
'columnspan' => array(),
'rowalign' => array(),
'columnalign' => array()),
'mpadded' => array('width' => array())
);
return $tags;
}`
If anyone's interested, you can find install at http://www.thetelegraphic.com/bbpress/bbpress/ (for now, once it's fully working it'll go to a dedicated domain).