Dsu.ac.kr W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A document must not include both a “meta” element with an “http-equiv” attribute whose value is “content-type”, and a “meta” element with a “charset” attribute.
Bad value “expire” for attribute “http-equiv” on element “meta”.
Bad value “cache-control” for attribute “http-equiv” on element “meta”.
Bad value “pragma” for attribute “http-equiv” on element “meta”.
A document must not include more than one “meta” element with a “http-equiv” attribute whose value is “content-type”.
Bad value “Content-Style-Type” for attribute “http-equiv” on element “meta”.
Bad value “imagetoolbar” for attribute “http-equiv” on element “meta”.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
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