19882 2012-11-06 16:01:28 +0000 @charset rule logic is not case insensitive & should state ASCII interpretation for clarity 2012-11-07 23:56:37 +0000 1 1 1 Unclassified CSS Syntax unspecified All All RESOLVED FIXED P2 normal --- 1 zackw jackalmage hsivonen kennyluck public-css-bugzilla oldest_to_newest 77953 0 zackw 2012-11-06 16:01:28 +0000 http://dev.w3.org/csswg/css3-syntax/#the-input-byte-stream step 3 currently reads > Check the byte stream. If the first several bytes match the hex sequence > > 40 63 68 61 72 73 65 74 20 22 (XX)* 22 3B > > then ... This has two problems, one semantic and one cosmetic. 1) It does not allow for ASCII case insensitivity and is therefore inconsistent with the rest of CSS. It also doesn't allow use of a single-quoted string (this latter omission is actually _more_ likely to cause problems IMO). 2) For clarity, the interpretation of this hex sequence as ASCII characters should be shown. Suggested edit: replace the quote above with > Check the byte stream. If the first several bytes match the hex sequence > > 40 (43|63) (48|68) (41|61) (52|72) (53|73) (55|65) (54|74) 20 (22|27) (XX)* QQ 3B > > where QQ must be the same as the earlier 22 or 27 byte, (these bytes encode > the text '@charset "...";', matched _ASCII case-insensitively_ and > allowing both single and double-quoted string literals) then ... For even greater consistency with normal CSS parsing, it might also be nice to allow arbitrary whitespace before and after the string (not just a single space before and none after), and leading whitespace before the initial @-sign. To do that, change the 20 to WW*, add another WW* at the beginning and a third before the final 3B, and refer to the encoding standard for the definition of ASCII whitespace. 77954 1 jackalmage 2012-11-06 16:03:34 +0000 Does that match browser behavior? I'm not interested in aligning @charset with other CSS parsing, because it's a very, very special thing. However, I'll match whatever browsers do. 77956 2 zackw 2012-11-06 16:30:13 +0000 The relevant code in Firefox is css::Loader::GetCharsetFromData, here: https://mxr.mozilla.org/mozilla-central/source/layout/style/Loader.cpp#611 It only allows lowercase "charset", it doesn't allow single-quoted strings, the @ must be the first character in the document, and there must be exactly one space before the initial " character and none between the closing " and the semicolon. I would consider the first two of these flat-out bugs in Firefox tbh. I am not as familiar with Webkit, but the relevant code _appears_ to be TextResourceDecoder::checkForCSSCharset, here: https://trac.webkit.org/browser/trunk/Source/WebCore/loader/TextResourceDecoder.cpp#L455 This also does case-sensitive matching as far as I can tell, but it allows both single- and double-quoted strings, and it allows arbitrary whitespace before and after the string. The @ still has to be the first character in the document. Later today I will put together a comprehensive test case and find out what IE and Opera do. 77973 3 1243 zackw 2012-11-06 19:20:27 +0000 Created attachment 1243 test case Here's a test case. It will show a list of variations on @charset and report whether they worked or not. If you get all "yes" or all "no" results you should suspect that the browser might actually be *ignoring* @charset within a data: URL. This appears to be the behavior of, at least, the version of Chromium I have on here. Results with all the browsers I can conveniently test with will follow. 77974 4 zackw 2012-11-06 19:20:56 +0000 @charset "utf-8"; yes @CHARSET "utf-8"; no @ChArSeT "utf-8"; no @cHaRsEt "utf-8"; no @charset"utf-8"; yes @charset "utf-8"; no @charset\9"utf-8"; no @charset\A"utf-8"; no @charset\C"utf-8"; no @charset\D"utf-8"; no @charset "utf-8" ; no @charset "utf-8"; no @charset 'utf-8'; no Mozilla/5.0 (X11; Linux x86_64; rv:16.0) Gecko/20100101 Firefox/16.0 Iceweasel/16.0.2 77975 5 zackw 2012-11-06 19:21:28 +0000 @charset "utf-8"; no @CHARSET "utf-8"; no @ChArSeT "utf-8"; no @cHaRsEt "utf-8"; no @charset"utf-8"; no @charset "utf-8"; no @charset\9"utf-8"; no @charset\A"utf-8"; no @charset\C"utf-8"; no @charset\D"utf-8"; no @charset "utf-8" ; no @charset "utf-8"; no @charset 'utf-8'; no Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.4 (KHTML, like Gecko) Chrome/22.0.1229.94 Safari/537.4 (this is the browser that appears to ignore @charset in a data: URL altogether) 77976 6 zackw 2012-11-06 19:22:05 +0000 @charset "utf-8"; yes @CHARSET "utf-8"; no @ChArSeT "utf-8"; no @cHaRsEt "utf-8"; no @charset"utf-8"; yes @charset "utf-8"; yes @charset\9"utf-8"; yes @charset\A"utf-8"; no @charset\C"utf-8"; no @charset\D"utf-8"; no @charset "utf-8" ; yes @charset "utf-8"; no @charset 'utf-8'; yes Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/535.22+ (KHTML, like Gecko) Chromium/17.0.963.56 Chrome/17.0.963.56 Safari/535.22+ Debian/unstable (3.4.2-2) Epiphany/3.4.2 (this is probably representative of *uncustomized* WebKit) 77978 7 zackw 2012-11-06 19:40:39 +0000 @charset "utf-8"; yes @CHARSET "utf-8"; yes @ChArSeT "utf-8"; yes @cHaRsEt "utf-8"; yes @charset"utf-8"; yes @charset "utf-8"; yes @charset\9"utf-8"; yes @charset\A"utf-8"; yes @charset\C"utf-8"; yes @charset\D"utf-8"; yes @charset "utf-8" ; yes @charset "utf-8"; yes @charset 'utf-8'; yes Opera/9.80 (Windows NT 6.1; WOW64; U; en) Presto/2.10.289 Version/12.00 ... and unfortunately, IE9 appears not to support this use of data: URLs, so I'm going to have to redo the test case with a whole bunch of tiny supporting files to get that to work. :-( 77981 8 1244 kennyluck 2012-11-06 23:58:53 +0000 Created attachment 1244 corrected test case 77982 9 kennyluck 2012-11-07 00:06:51 +0000 (In reply to comment #4) > @charset"utf-8"; yes I was puzzled by this as the code is pretty clear. Then I figured "b1"'s data URL isn't correct. It now gives me: @charset "utf-8"; yes @CHARSET "utf-8"; no @ChArSeT "utf-8"; no @cHaRsEt "utf-8"; no @charset"utf-8"; no @charset "utf-8"; no @charset\9"utf-8"; no @charset\A"utf-8"; no @charset\C"utf-8"; no @charset\D"utf-8"; no @charset "utf-8" ; no @charset "utf-8"; no @charset 'utf-8'; no Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/17.0 Firefox/17.0 (In reply to comment #7) > ... and unfortunately, IE9 appears not to support this use of data: URLs, so > I'm going to have to redo the test case with a whole bunch of tiny > supporting files to get that to work. :-( So I did that for you ;) @charset "utf-8"; yes @CHARSET "utf-8"; no @ChArSeT "utf-8"; no @cHaRsEt "utf-8"; no @charset"utf-8"; no @charset "utf-8"; no @charset\9"utf-8"; no @charset\A"utf-8"; no @charset\C"utf-8"; no @charset\D"utf-8"; no @charset "utf-8" ; no @charset "utf-8"; no @charset 'utf-8'; no Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; eSobiSubscriber 2.0.4.16; .NET4.0C) It's not suprsing to me as CSS 2.1 is OK clear here: # @charset must be written literally, i.e., the 10 characters '@charset "' # (lowercase, no backslash escapes), followed by the encoding name, followed # by '";'. 77985 10 jackalmage 2012-11-07 01:28:33 +0000 Yay! With Firefox and IE9 both being very strict, it looks like I can justify patching WebKit to be strict, and keeping the spec strict as well. 77987 11 hsivonen 2012-11-07 07:17:44 +0000 (In reply to comment #10) > Yay! With Firefox and IE9 both being very strict, it looks like I can > justify patching WebKit to be strict, and keeping the spec strict as well. Cool. (Aside: Allowing multiple spaces between "@charset" and the quote would have been particularly annoying, since it would have introduced the problem XML has: There can be an arbitrary amount of whitespace padding in XML after "<?xml" but before "encoding=", so implementations end up setting an arbitrary limit.) 78022 12 zackw 2012-11-07 23:35:08 +0000 Yeah, given mostly-consistent browser behavior I am OK keeping the spec strict as well. Please add an explanation of the ASCII interpretation of the byte stream, though. 78023 13 jackalmage 2012-11-07 23:56:37 +0000 (In reply to comment #12) > Yeah, given mostly-consistent browser behavior I am OK keeping the spec > strict as well. Please add an explanation of the ASCII interpretation of > the byte stream, though. Done. I'll mark this as fixed, and go patch webkit. 1243 2012-11-06 19:20:27 +0000 2012-11-06 23:58:53 +0000 test case css-charset-acceptable-variation.html text/html 3504 zackw PCFkb2N0eXBlIGh0bWw+CjxoZWFkPgo8bWV0YSBjaGFyc2V0PSJ1cy1hc2NpaSI+Cjx0aXRsZT5U ZXN0IG9mIHdoYXQgdmFyaWF0aW9ucyBvbiB0aGUgQGNoYXJzZXQgZGlyZWN0aXZlIGFyZQogICAg ICAgYWNjZXB0YWJsZTwvdGl0bGU+CjwhLS0gVGhlIGZvcm1hbCBzeW50YXggb2YgQGNoYXJzZXQg aXMKCiAgICBAY2hhcnNldCBTVFJJTkcgOwoKICBJZiBwYXJzZWQgYWNjb3JkaW5nIHRvIHRoZSBu b3JtYWwgQ1NTIGdyYW1tYXIsIHRoZSB3b3JkICJjaGFyc2V0IiBpbgogIEBjaGFyc2V0IHdvdWxk IGJlIGNhc2UtaW5zZW5zaXRpdmUsIGVpdGhlciBhIHNpbmdsZS0gb3IgZG91YmxlLQogIHF1b3Rl ZCBzdHJpbmcgbWlnaHQgZm9sbG93LCBhbmQgdGhlcmUgY291bGQgYmUgYW55IGFtb3VudCBvZgog IHdoaXRlc3BhY2UgYm90aCBiZWZvcmUgYW5kIGFmdGVyIHRoZSBzdHJpbmcgbGl0ZXJhbC4gIEhv d2V2ZXIsCiAgYmVjYXVzZSBpdCBpcyBuZWNlc3NhcnkgdG8gcHJvY2VzcyBAY2hhcnNldCBiZWZv cmUgdGhlIGFjdHVhbAogIGNoYXJhY3RlciBzZXQgb2YgdGhlIGZpbGUgaXMga25vd24sIGEgc3Bl 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2012-11-06 23:58:53 +0000 corrected test case css-charset-acceptable-variation.html text/html 3501 kennyluck PCFkb2N0eXBlIGh0bWw+CjxoZWFkPgo8bWV0YSBjaGFyc2V0PSJ1cy1hc2NpaSI+Cjx0aXRsZT5U ZXN0IG9mIHdoYXQgdmFyaWF0aW9ucyBvbiB0aGUgQGNoYXJzZXQgZGlyZWN0aXZlIGFyZQogICAg ICAgYWNjZXB0YWJsZTwvdGl0bGU+CjwhLS0gVGhlIGZvcm1hbCBzeW50YXggb2YgQGNoYXJzZXQg aXMKCiAgICBAY2hhcnNldCBTVFJJTkcgOwoKICBJZiBwYXJzZWQgYWNjb3JkaW5nIHRvIHRoZSBu b3JtYWwgQ1NTIGdyYW1tYXIsIHRoZSB3b3JkICJjaGFyc2V0IiBpbgogIEBjaGFyc2V0IHdvdWxk IGJlIGNhc2UtaW5zZW5zaXRpdmUsIGVpdGhlciBhIHNpbmdsZS0gb3IgZG91YmxlLQogIHF1b3Rl ZCBzdHJpbmcgbWlnaHQgZm9sbG93LCBhbmQgdGhlcmUgY291bGQgYmUgYW55IGFtb3VudCBvZgog IHdoaXRlc3BhY2UgYm90aCBiZWZvcmUgYW5kIGFmdGVyIHRoZSBzdHJpbmcgbGl0ZXJhbC4gIEhv d2V2ZXIsCiAgYmVjYXVzZSBpdCBpcyBuZWNlc3NhcnkgdG8gcHJvY2VzcyBAY2hhcnNldCBiZWZv cmUgdGhlIGFjdHVhbAogIGNoYXJhY3RlciBzZXQgb2YgdGhlIGZpbGUgaXMga25vd24sIGEgc3Bl Y2lhbCBzaW1wbGlmaWVkIHBhcnNlciBpcwogIHVzZWQsIHdoaWNoIG1heSBub3QgYWNjZXB0IGFs 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