Yellowfinbi.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
No space between attributes.
Bad value “presentation” for attribute “role” on element “a”.
Bad value “” for attribute “width” on element “img”: The empty string is not a valid non-negative integer.
When the “srcset” attribute has any image candidate string with a width descriptor, the “sizes” attribute must also be present.
Bad value “” for attribute “poster” on element “video”: Must be non-empty.
Bad value “” for attribute “src” on element “source”: Must be non-empty.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “for” attribute of the “label” element must refer to a non-hidden form control.
Warnings:
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
The “banner” role is unnecessary for element “header”.
Empty heading.
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