From Htmlpedia
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OpenSP: DTDs other than base allowed only if CONCUR YES or EXPLICIT YES
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Cause:
This eror can happens when 2 DTDs are declared in a page.
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Example:
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd" > |
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd" > |
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Solution:
Remove one of the declaration.
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References:
- W3 validator: http://validator.w3.org/
