Webmath.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Almost standards mode doctype. Expected “<!DOCTYPE html>”.
A “link” element with a “sizes” attribute must have a “rel” attribute that contains the value “icon” or the value “apple-touch-icon”.
The “align” attribute on the “div” element is obsolete. Use CSS instead.
A numeric character reference expanded to the C1 controls range.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad value “” for attribute “src” on element “img”: Must be non-empty.
The “align” attribute on the “img” element is obsolete. Use CSS instead.
Attribute “value” not allowed on element “img” at this point.
End tag “div” seen, but there were open elements.
Unclosed element “form”.
Stray end tag “form”.
Warnings:
The “language” attribute on the “script” element is obsolete. You can safely omit it.
The “name” attribute is obsolete. Consider putting an “id” attribute on the nearest container instead.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
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