Errors:
Legacy doctype. Expected “<!DOCTYPE html>”.
When the attribute “xml:lang” in no namespace is specified, the element must also have the attribute “lang” present with the same value.
The “version” attribute on the “html” element is obsolete. You can safely omit it.
The “profile” attribute on the “head” element is obsolete. To declare which “meta” terms are used in the document, instead register the names as meta extensions. To trigger specific UA behaviors, use a “link” element instead.
A document must not include both a “meta” element with an “http-equiv” attribute whose value is “content-type”, and a “meta” element with a “charset” attribute.
Bad value “header” for attribute “role” on element “header”.
Bad value “” for attribute “name” on element “button”: Must not be empty.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “div” is missing one or more of the following attributes: “role”.
Duplicate ID “order”.
Duplicate ID “bill”.
Element “div” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Element “li” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Element “source” is missing required attribute “srcset”.
Bad value “footer” for attribute “role” on element “footer”.
Bad value “footer” for attribute “role” on element “section”.
The “itemprop” attribute was specified, but the element is not a property of any item.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The first occurrence of ID “order” was here.
The first occurrence of ID “bill” was here.
The “complementary” role is unnecessary for element “aside”.
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