Cbmcalculator.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “cache-control” for attribute “http-equiv” on element “meta”.
Bad value “expires” for attribute “http-equiv” on element “meta”.
Bad value “pragma” for attribute “http-equiv” on element “meta”.
Attribute “http-equiv” not allowed on element “meta” at this point.
Duplicate attribute “content”.
Bad value “true” for attribute “readonly” on element “input”.
Bad value “” for attribute “id” on element “label”: An ID must not be the empty string.
Duplicate ID “”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The “name” attribute on the “img” element is obsolete. Use the “id” attribute instead.
The “longdesc” attribute on the “img” element is obsolete. Use a regular “a” element to link to the description.
Warnings:
The first occurrence of ID “” was here.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
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