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Tidy: SYSTEM, PUBLIC, W3C, DTD, EN must be upper case
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Cause:
A DOCTYPE Declaration is mandatory for most current markup languages and without one it is impossible to reliably validate a document. The DOCTYPE defines the version of the document like : HTML 4.0.1, XHTML 1.0, 1.1, ... Certain Parts of this declaration must be written in upper case
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Examples:
 | <!doctype html public "-//w3c//dtd xhtml 1.0 Strict//en" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"> <head> <title>XHTML-document</title> </head> ... |
 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"> <head> <title>XHTML-document</title> </head> ... |
| <!doctype html public "-//w3c//dtd html 4.01 Transitional//en" "http://www.w3.org/TR/html4/loose.dtd"> <html lang="en"> <head> <title>HTML-document</title> <head> ... |
| <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html lang="en"> <head> <title>HTML-document</title> <head> ... |
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Solution:
Ensure that the correct parts of the DOCTYPE declaration are written in upper case.
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References:
- W3C spec: http://www.w3.org/TR/html4/struct/global.html#h-7.2
- W3C faq: http://validator.w3.org/docs/help.html#faq-doctype
- List of valid doctype: http://www.w3.org/QA/2002/04/valid-dtd-list.html
- Choosing a doctype: http://htmlhelp.com/tools/validator/doctype.html
