Trelora.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Duplicate ID “Shape”.
The element “a” must not appear as a descendant of the “button” element.
Bad value “Where are you looking?” for attribute “id” on element “button”: An ID must not contain whitespace.
Element “section” not allowed as child of element “button” in this context. (Suppressing further errors from this subtree.)
Attribute “value” not allowed on element “a” 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.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Attribute “ ” not allowed on element “script” at this point.
The “aria-labelledby” attribute must point to an element in the same document.
Warnings:
The first occurrence of ID “Shape” was here.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “button” role is unnecessary for element “button”.
Attribute “ ” is not serializable as XML 1.0.
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