Errors:
A document must not include both a “meta” element with an “http-equiv” attribute whose value is “content-type”, and a “meta” element with a “charset” attribute.
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
The element “button” must not appear as a descendant of the “a” element.
No “p” element in scope but a “p” end tag seen.
No space between attributes.
Quote “"” in attribute name. Probable cause: Matching quote missing somewhere earlier.
Attribute “bone” not allowed on element “img” at this point.
Attribute “hill:” not allowed on element “img” at this point.
Attribute “the” not allowed on element “img” at this point.
Attribute “concert""” not allowed on element “img” at this point.
Bad value “” for attribute “src” on element “img”: Must be non-empty.
CSS: “backgroundcolor”: Property “backgroundcolor” doesn't exist.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
Text not allowed in element “iframe” in this context.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “form” role is unnecessary for element “form”.
The “navigation” role is unnecessary for element “nav”.
The “name” attribute is obsolete. Consider putting an “id” attribute on the nearest container instead.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Attribute “hill:” is not serializable as XML 1.0.
Attribute “concert""” is not serializable as XML 1.0.
The “type” attribute is unnecessary for JavaScript resources.
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