Warnings:
The “language” attribute on the “script” element is obsolete. You can safely omit it.
The “banner” role is unnecessary for element “header”.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
The first occurrence of ID “” was here.
The “contentinfo” role is unnecessary for element “footer”.
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).
Errors:
No space between attributes.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
A slash was not immediately followed by “>”.
Bad value “(max-resolution: 1dppx) 580px, 100vw” for attribute “sizes” on element “img”: Bad media condition: Expected a resolution unit but saw “)” instead at “…resolution: 1dppx) 580px,”.
The “sizes” attribute may be specified only if the “srcset” attribute is also present.
The “center” element is obsolete. Use CSS instead.
Element “area” is missing required attribute “alt”.
Bad value “” for attribute “id” on element “a”: An ID must not be the empty string.
Duplicate ID “”.
Attribute “nopin” not allowed on element “img” at this point.
The “for” attribute of the “label” element must refer to a non-hidden form control.
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