Marks.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Stray doctype.
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
Forbidden code point U+0080.
Bad value “” for attribute “src” on element “img”: Must be non-empty.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad value “(min-width: 641px) and (min-device-pixel-ratio: 2.0), (min-width: 641px) and (-webkit-min-device-pixel-ratio: 2.0)” for attribute “media” on element “source”: Expected a CSS media feature but saw “min-device-pixel-ratio” instead.
Bad value “(min-device-pixel-ratio: 2.0),(-webkit-min-device-pixel-ratio: 2.0)” for attribute “media” on element “source”: Expected a CSS media feature but saw “min-device-pixel-ratio” instead.
Bad value “(min-device-pixel-ratio: 2.0), (-webkit-min-device-pixel-ratio: 2.0)” for attribute “media” on element “source”: Expected a CSS media feature but saw “min-device-pixel-ratio” instead.
Element “img” is missing required attribute “src”.
A “source” element that has a following sibling “source” element or “img” element with a “srcset” attribute must have a “media” attribute and/or “type” attribute.
Attribute “alt” not allowed on element “a” at this point.
Warnings:
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “main” role is unnecessary for element “main”.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
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