Created attachment 1317 [details]
Screenshot of meaningless warning.
Steps to repeat:
1. Locate a page of the following characteristics:
a. has XHTML5 markup.
b. has <meta charset="UTF-8"/>
c. has Content-Type text/html *without* charset parameter
d. is served via HTTP or via data URI
2. Check the page with XML parser: http://tinyurl.com/a95tvf8
Expected result: Since the page contains <meta charset="UTF-8"/>
the page uses UTF-8 encoding in the text/html
Content-Type and will therefore not cause any
error message despite that the Content-Type
lacks the charset parameter:
Therefore I wouldn't expect that overriding the
Content-Type ("lax about Content-Type") would
cause any warning with regard to the charset
paramter of the *original* Content-Type.
Actual result: Validator gives a confusing message were it
claims that it, quote, "Would have defaulted to
US-ASCII had the lax option not been chosen."