Sortd.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “true” for attribute “autofocus” on element “input”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Duplicate ID “install-button”.
Bad value “100%” for attribute “width” on element “video”: Expected a digit but saw “%” instead.
Bad value “auto” for attribute “height” on element “video”: Expected a digit but saw “a” instead.
Attribute “poster” not allowed on element “source” at this point.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “allowtransparency” attribute on the “iframe” element is obsolete. Use CSS instead.
The “for” attribute of the “label” element must refer to a non-hidden form control.
Warnings:
The “navigation” role is unnecessary for element “nav”.
The first occurrence of ID “install-button” was here.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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