Errors:
Almost standards mode doctype. Expected “<!DOCTYPE html>”.
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
Attribute “structure_name” not allowed on element “section” at this point.
Attribute “structure_id” not allowed on element “section” at this point.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Stray start tag “td”.
Attribute “width” not allowed on element “ul” at this point.
Stray end tag “td”.
Attribute “structure_name” not allowed on element “div” at this point.
Attribute “structure_id” not allowed on element “div” at this point.
The “align” attribute on the “table” element is obsolete. Use CSS instead.
The “width” attribute on the “table” element is obsolete. Use CSS instead.
The “cellpadding” attribute on the “table” element is obsolete. Use CSS instead.
The “cellspacing” attribute on the “table” element is obsolete. Use CSS instead.
The “border” attribute on the “table” element is obsolete. Use CSS instead.
Attribute “name” not allowed on element “div” at this point.
Bad value “sign up” for attribute “id” on element “section”: An ID must not contain whitespace.
Bad value “add event” for attribute “id” on element “section”: An ID must not contain whitespace.
Duplicate ID “add event”.
Bad value “” for attribute “poster” on element “video”: Must be non-empty.
Bad value “” for attribute “id” on element “section”: An ID must not be the empty string.
Duplicate ID “”.
Warnings:
The “language” attribute on the “script” element is obsolete. You can safely omit it.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The first occurrence of ID “add event” was here.
The first occurrence of ID “” was here.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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