WCAG 2.0 4.1.1 Parsing (elements have complete start and end tags)

criteria 4.1.1 [1] parsing, requires complete start and end tags for all
elements.

"In content implemented using markup languages, elements have complete
start and end tags"

in HTML end tags certain end tags are optional [2] and certain elements
have no end tags (<img>, <input> etc.) How do we explain/reconcile this
disparity?



[1] http://www.w3.org/TR/WCAG20/#ensure-compat

[2]
http://www.w3.org/html/wg/drafts/html/master/syntax.html#syntax-tag-omission
:
--

Regards

SteveF
HTML 5.1 <http://www.w3.org/html/wg/drafts/html/master/>