Allbusinessschools.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “” for attribute “media” on element “link”: Media query ended prematurely.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Attribute “type” not allowed on element “div” at this point.
Duplicate ID “asdbuttonbigger”.
Quote “"” in attribute name. Probable cause: Matching quote missing somewhere earlier.
Attribute “vertical-align:” not allowed on element “img” at this point.
Attribute “middle;"” not allowed on element “img” 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.
Element “style” not allowed as child of element “body” in this context. (Suppressing further errors from this subtree.)
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The first occurrence of ID “asdbuttonbigger” was here.
Attribute “vertical-align:” is not serializable as XML 1.0.
Attribute “middle;"” is not serializable as XML 1.0.
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