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[Bug 11597] New: mismatch between parsing rule and valid syntax for meta refresh URL

From: <bugzilla@jessica.w3.org>
Date: Thu, 23 Dec 2010 09:15:23 +0000
To: public-html-bugzilla@w3.org
Message-ID: <bug-11597-2486@http.www.w3.org/Bugs/Public/>

           Summary: mismatch between parsing rule and valid syntax for
                    meta refresh URL
           Product: HTML WG
           Version: unspecified
          Platform: PC
               URL: http://bugzilla.validator.nu/show_bug.cgi?id=762
        OS/Version: Windows NT
            Status: NEW
          Severity: normal
          Priority: P2
         Component: HTML5 spec (editor: Ian Hickson)
        AssignedTo: ian@hixie.ch
        ReportedBy: julian.reschke@gmx.de
         QAContact: public-html-bugzilla@w3.org
                CC: mike@w3.org, public-html-wg-issue-tracking@w3.org,

See http://dev.w3.org/html5/spec/Overview.html#attr-meta-http-equiv-refresh

"For meta elements with an http-equiv attribute in the Refresh state, the
content attribute must have a value consisting either of:

    * just a valid non-negative integer, or
    * a valid non-negative integer, followed by a U+003B SEMICOLON character
(;), followed by one or more space characters, followed by a substring that is
an ASCII case-insensitive match for the string "URL", followed by a U+003D
EQUALS SIGN character (=), followed by a valid URL."

This makes the following string conforming

  <meta http-equiv="Refresh" content="20; URL='foo'bar'">



is a valid URI reference according to RFC 3986.

However, the parsing instructions special case leading ' and " characters, and
will truncate at the 2nd occurence, so the value is actually handled as


The conformance criteria apparently need to take surrounding quoted into
account, may be by defining "valid optionally quoted URL".

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Received on Thursday, 23 December 2010 09:15:25 UTC

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