Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The first occurrence of ID “logo” was here.
Attribute “`” is not serializable as XML 1.0.
The “date” input type is not supported in all browsers. Please be sure to test, and consider using a polyfill.
The first occurrence of ID “flexible-box” was here.
Empty heading.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
Errors:
Attribute “async” not allowed on element “link” at this point.
A document must not include more than one “meta” element with its “name” attribute set to the value “description”.
Bad value “100%” for attribute “width” on element “img”: Expected a digit but saw “%” instead.
The element “button” must not appear as a descendant of the “a” element.
Duplicate ID “logo”.
Element “div” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
No space between attributes.
Attribute “`” not allowed on element “div” at this point.
Attribute “valuetype” not allowed on element “option” at this point.
Duplicate ID “flexible-box”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The “font” element is obsolete. Use CSS instead.
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