Warnings:
Content-Security-Policy HTTP header: Bad content security policy: Source list contains duplicate source expression "https://www.youtube.com". All but the first instance will be ignored.
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Consider using the “h1” element as a top-level heading only (all “h1” elements are treated as top-level headings by many screen readers and other tools).
The “contentinfo” role is unnecessary for element “footer”.
The “type” attribute is unnecessary for JavaScript resources.
Errors:
CSS: “white-space”: “no-wrap” is not a “white-space” value.
CSS: Unknown pseudo-element or pseudo-class “:horizontal”
CSS: “background”: The first argument to the “linear-gradient” function should be “to left”, not “left”.
Bad value “subscribe-rss” for attribute “rel” on element “a”: The string “subscribe-rss” is not a registered keyword.
Bad value “search” for attribute “role” on element “fieldset”.
Attribute “results” not allowed on element “input” at this point.
Attribute “pubdate” not allowed on element “time” at this point.
The “center” element is obsolete. Use CSS instead.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Attribute “update” not allowed on element “div” at this point.
No “p” element in scope but a “p” end tag seen.
Stray end tag “td”.
Bad value “https://fonts.googleapis.com/css?family=PT+Serif:regular,italic,bold|PT+Sans:regular,italic,bold|Droid+Sans:400,700|Lato:700,900” for attribute “href” on element “link”: Illegal character in query: “|” is not allowed.
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