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htmlpurifier/docs/ref-loose-vs-strict.txt

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Loose versus Strict
Changes from one doctype to another
There are changes. Wow, how insightful. Not everything changed is relevant
to HTML Purifier, though, so let's take a look:
== Major incompatibilities ==
BLOCKQUOTE changes from 'flow' to 'block'
behavior: inline inner contents should not be nuked, paragraph as necessary
U, S, STRIKE cut
behavior: replace with appropriate inline span + CSS
ADDRESS from potpourri to Inline (removes p tags)
behavior: p tags silently dropped or replaced with something (<br>)
== Things we can loosen up ==
Tags DIR, MENU, CENTER, ISINDEX, FONT, BASEFONT? allowed in loose
Attributes allowed in loose:
div,p,h#.align
ul,ol.type
ul,ol,dl.compact
ol.start
li.type,value
hr.align,noshade,size,width
pre.width
img.name?,align,border,hspace,vspace
table.align,bgcolor
caption.align
tr.bgcolor
th,td.nowrap,bgcolor,width,height
== Periphery issues ==
A tag's attribute 'target' (for selecting frames) cut
behavior: shouldn't be needed, use loose doctype if needed
OL/LI tag's attribute 'start' (for renumbering lists) cut
behavior: no substitute, just delete
Attribute 'name' deprecated in favor of 'id'
behavior: create proper AttrTransform
PRE tag allows SUB/SUP? (strict dtd comment vs syntax, loose disallows)