Ytgram.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
Bad value “https://fonts.googleapis.com/css?family=Roboto:300,400,500,700|Roboto+Slab:400,700” for attribute “href” on element “link”: Illegal character in query: “|” is not allowed.
Bad value “cz” for attribute “hreflang” on element “link”: The language subtag “cz” is not a valid ISO language part of a language tag.
Bad value “vn” for attribute “hreflang” on element “link”: The language subtag “vn” is not a valid ISO language part of a language tag.
Attribute “color-on-scroll” not allowed on element “nav” at this point.
The “itemprop” attribute was specified, but the element is not a property of any item.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
Empty heading.
The “type” attribute is unnecessary for JavaScript resources.
Consider adding a “lang” attribute to the “html” start tag to declare the language of this document.
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