500px.org W3C HTML Markup Validation
HTML markup errors and warnings
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Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
Consider using the “h1” element as a top-level heading only (all “h1” elements are treated as top-level headings by many screen readers and other tools).
The first occurrence of ID “Layer_1” was here.
The first occurrence of ID “Rectangle” was here.
The first occurrence of ID “Symbols” was here.
The first occurrence of ID “Icon-/-X-/-Light” was here.
The first occurrence of ID “3pt” was here.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
Errors:
Saw “<?”. Probable cause: Attempt to use an XML processing instruction in HTML. (XML processing instructions are not supported in HTML.)
Stray doctype.
Duplicate ID “Layer_1”.
Bad value “Icon-/-X-/-Light” for attribute “id” on element “g”: Not a valid XML 1.0 name.
Bad value “3pt” for attribute “id” on element “g”: Not a valid XML 1.0 name.
Duplicate ID “Rectangle”.
Duplicate ID “Symbols”.
Duplicate ID “Icon-/-X-/-Light”.
Duplicate ID “3pt”.
Element “h5” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Element “style” not allowed as child of element “body” in this context. (Suppressing further errors from this subtree.)
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
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