The HTML5 spec appears to allow ">" inside an attribute value. For example, the following page (note the body tag) passes the experimental HTML5 validator at w3c.org:
<!DOCTYPE HTML><html><head><title></title></head> <body class="3>2"> </body></html> I think ">" should be disallowed inside attribute values. It is disallowed in XHTML [1]. It is disallowed in HTML 4.01 [2]. Disallowing it in HTML5 would avoid unnecessary divergence, and also sometimes simplify parsing. --Ben [1] according to the validator in XHTML 1.1 Strict mode. 'character ">" is not allowed in the value of attribute' [2] http://www.w3.org/TR/REC-html40/charset.html#h-5.3.2 "Similarly, authors should use ">" (ASCII decimal 62) in text instead of ">" to avoid problems with older user agents that incorrectly perceive this as the end of a tag (tag close delimiter) when it appears in quoted attribute values." It is also disallowed by the HTML 4.01 Strict validator.
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