Iterable.com W3C HTML Markup Validation
HTML markup errors and warnings
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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.
Errors:
Bad value “only screen and (-moz-min-device-pixel-ratio: 2), only screen and (-o-min-device-pixel-ratio: 2/1), only screen and (-webkit-min-device-pixel-ratio: 2), only screen and (min-device-pixel-ratio: 2)” for attribute “media” on element “style”: Expected a CSS media feature but saw “-moz-min-device-pixel-ratio” instead.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Element “style” not allowed as child of element “section” in this context. (Suppressing further errors from this subtree.)
The “center” element is obsolete. Use CSS instead.
Element “style” not allowed as child of element “body” in this context. (Suppressing further errors from this subtree.)
Attribute “href” not allowed on element “div” at this point.
Duplicate attribute “id”.
Bad value “tel:+1 (415) 723-5230” for attribute “href” on element “a”: Illegal character in scheme data: space is not allowed.
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