Birdsnest.com.au W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Attribute “content” not allowed on element “header” at this point.
The element “a” must not appear as a descendant of the “button” element.
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.
The “itemtype” attribute must not be specified on elements that do not have an “itemscope” attribute specified.
Bad value “” for attribute “name” on element “input”: Must not be empty.
Element “script” must not have attribute “defer” unless attribute “src” is also specified.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Warnings:
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “navigation” role is unnecessary for element “nav”.
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).
Document uses the Unicode Private Use Area(s), which should not be used in publicly exchanged documents. (Charmod C073)
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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