Onthegrid.city W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
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.
Attribute “transform-origin” not allowed on element “use” at this point.
Element “div” not allowed as child of element “button” in this context. (Suppressing further errors from this subtree.)
Bad value “” for attribute “srcset” on element “img”: Must contain one or more image candidate strings.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Duplicate ID “Layer_1”.
Stray doctype.
Saw “<?”. Probable cause: Attempt to use an XML processing instruction in HTML. (XML processing instructions are not supported in HTML.)
Bad value “https://twitter.com/intent/tweet?text=On the Grid - City%20guides%20by%20local%20creatives https%3A%2F%2Fonthegrid.city%2F” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “mailto:?body=On the Grid - City%20guides%20by%20local%20creatives https%3A%2F%2Fonthegrid.city%2F” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Warnings:
The “main” role is unnecessary for element “main”.
The first occurrence of ID “Layer_1” was here.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Empty heading.
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