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htmlpurifier/docs/ref-loose-vs-strict.txt
Edward Z. Yang 92b3f0e817 [1.3.0] <li value="4"> and <ul start="2"> now allowed in loose mode
- Updated progress with some more impl-no decisions
 - Loose vs. Strict now has better tallying on current behavior
 - Document what we're not allowing in loose
 - Strict boolean indicator added to HTMLDefinition
 - Added XHTML 1.1 to TODO.

git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@571 48356398-32a2-884e-a903-53898d9a118a
2006-11-23 22:15:35 +00:00

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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 ==
[done] BLOCKQUOTE changes from 'flow' to 'block'
current behavior: inline inner contents should not be nuked, block-ify as necessary
[partially-done] U, S, STRIKE cut
current behavior: removed completely
projected behavior: replace with appropriate inline span + CSS
[done] ADDRESS from potpourri to Inline (removes p tags)
current behavior: block tags silently dropped
ideal behavior: replace tags with something like <br>. (not high priority)
== Things we can loosen up ==
Tags DIR, MENU, CENTER, ISINDEX, FONT, BASEFONT? allowed in loose
current behavior: transform to strict-valid forms
Attributes allowed in loose (see attribute transforms in 'dev-progress.html')
current behavior: projected to transform into strict-valid forms
== Periphery issues ==
A tag's attribute 'target' (for selecting frames) cut
current behavior: not allowed at all
projected behavior: use loose doctype if needed, needs valid values
[done] OL/LI tag's attribute 'start'/'value' (for renumbering lists) cut
current behavior: no substitute, just delete when in strict, allow in loose
Attribute 'name' deprecated in favor of 'id'
current behavior: dropped silently
projected behavior: create proper AttrTransform (currently not allowed at all)
[done] PRE tag allows SUB/SUP? (strict dtd comment vs syntax, loose disallows)
current behavior: disallow as usual