[whatwg] More prohibited characters for unquoted attributes are needed

Aryeh Gregor Simetrical+w3c at gmail.com
Sun Sep 6 04:35:50 PDT 2009

See some research here:


It seems like in addition to whitespace and "'=<> , the characters
U+0000 through U+0020 should be banned from unquoted attribute values,
as well as U+0060 (backtick `), for the sake of compatibility.

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