I’d not heard of this new html style…

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I had 2 or 3 attempts at trying to allow just a limited subset of html through elsewhere. I think the version I eventually settled on ran.

1. Change angle brackets to my own markers (IIRC, needed as there could be existing > and < in the post).
2. Pattern match the post against an array of expressions for “allowed html” and change matches back to the brackets.
3. Change any remaining markers to < and >

In theory and if I've got that right, that would leave the allowed stuff as working html while making other use of the brackets (including in abc) “display only”.