Cheekyscientist.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Saw “<!--” within a comment. Probable cause: Nested comment (not allowed).
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad value “65px” for attribute “width” on element “img”: Expected a digit but saw “p” instead.
The “center” element is obsolete. Use CSS instead.
Duplicate ID “first-step”.
Element “style” not allowed as child of element “body” in this context. (Suppressing further errors from this subtree.)
Warnings:
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The first occurrence of ID “first-step” was here.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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