Ncalculators.com 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 “Content-Style-Type” for attribute “http-equiv” on element “meta”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The “font” element is obsolete. Use CSS instead.
The “align” attribute on the “input” element is obsolete. Use CSS instead.
The “width” attribute on the “td” element is obsolete. Use CSS instead.
Duplicate ID “table_opt”.
Duplicate ID “table_a”.
Duplicate ID “table_b”.
Duplicate ID “table_error”.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
The first occurrence of ID “table_opt” was here.
The first occurrence of ID “table_a” was here.
The first occurrence of ID “table_b” was here.
The first occurrence of ID “table_error” was here.
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