Knepublishing.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Almost standards mode doctype. Expected “<!DOCTYPE html>”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Duplicate ID “Menu”.
Duplicate ID “reviewersMenu”.
End tag “br”.
The text content of element “script” was not in the required format: Expected space, tab, newline, or slash but found “<” instead.
Text not allowed in element “ul” in this context.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “navigation” role is unnecessary for element “nav”.
The first occurrence of ID “Menu” was here.
The first occurrence of ID “reviewersMenu” was here.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
Indonesia ID