Ytddownloader.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Almost standards mode doctype. Expected “<!DOCTYPE html>”.
Attribute “rel” not allowed on element “input” at this point.
Attribute “addthis:url” not allowed on element “div” at this point.
Attribute “alt” not allowed on element “span” at this point.
Attribute “os” not allowed on element “a” at this point.
A “link” element must not appear as a descendant of a “body” element unless the “link” element has an “itemprop” attribute or has a “rel” attribute whose value contains “dns-prefetch”, “pingback”, “preconnect”, “prefetch”, “preload”, “prerender”, or “stylesheet”.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
Attribute “addthis:url” is not serializable as XML 1.0.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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