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Html code: <!DOCTYPE html> <html><head> <meta charset="UTF-8" /> <title>Hello world</title> <meta http-equiv="cache-control" content="no-cache" /> </head> <body> hello world </body></html> Returns error: Line 5, Column 54: Bad value cache-control for attribute http-equiv on element meta. I think cache-control should be valid attribute: http://www.html-5.com/metatags Regards, Jernej
http-equiv="cache-control" is not valid according to the HTML5 spec: http://dev.w3.org/html5/spec/semantics.html#attr-meta-http-equiv so the validator behavior is correct here. If you think http-equiv="cache-control" should be valid, please raise a bug against the HTML5 spec: http://w3.org/brief/MjA2