Appliedbehavioranalysisedu.org W3C HTML Markup Validation
HTML markup errors and warnings
(Rescan now...)
Errors:
Start tag “head” seen but an element of the same type was already open.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad value “https://landing.masononline.gmu.edu/msped-af?utm_source=xyz&utm_campaign=appliedbehavioranalysisedu&utm_content={AdFormat}&utm_term={Keyword/Content}&viq_channel=af” for attribute “href” on element “a”: Illegal character in query: “{” is not allowed.
Duplicate ID “map”.
The “id” attribute on a “map” element must have an the same value as the “name” attribute.
The “align” attribute on the “p” element is obsolete. Use CSS instead.
Duplicate ID “leftnav”.
Warnings:
The “banner” role is unnecessary for element “header”.
The “navigation” role is unnecessary for element “nav”.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
The first occurrence of ID “map” was here.
The first occurrence of ID “leftnav” was here.
The “contentinfo” role is unnecessary for element “footer”.
United States US