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HTML markup errors and warnings
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Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “type” attribute is unnecessary for JavaScript resources.
The first occurrence of ID “signin” was here.
The first occurrence of ID “signup” was here.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
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:
Bad value “android-touch-icon” for attribute “rel” on element “link”: The string “android-touch-icon” is not a registered keyword.
Duplicate ID “signin”.
Duplicate ID “signup”.
Element “div” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
When the “srcset” attribute has any image candidate string with a width descriptor, the “sizes” attribute must also be present.
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