Adjust.io W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Duplicate ID “Stroke-1”.
Duplicate ID “Stroke-3”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Saw “<?”. Probable cause: Attempt to use an XML processing instruction in HTML. (XML processing instructions are not supported in HTML.)
Attribute “webkitallowfullscreen” not allowed on element “iframe” at this point.
Attribute “mozallowfullscreen” not allowed on element “iframe” at this point.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
No “p” element in scope but a “p” end tag seen.
Start tag “a” seen but an element of the same type was already open.
Self-closing syntax (“/>”) used on a non-void HTML element. Ignoring the slash and treating as a start tag.
End tag “div” seen, but there were open elements.
Unclosed element “a”.
Stray end tag “a”.
End tag for “body” seen, but there were unclosed elements.
Unclosed element “div”.
Warnings:
The first occurrence of ID “Stroke-1” was here.
The first occurrence of ID “Stroke-3” was here.
The “main” role is unnecessary for element “main”.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
Empty heading.
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