Educreations.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.
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).
Errors:
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The element “video” with the attribute “controls” must not appear as a descendant of the “a” element.
Bad value “video/mp4; codecs=avc1.42E01E,mp4a.40.2” for attribute “type” on element “source”: Expected a token character, whitespace or a semicolon but saw “,” instead.
Bad value “video/webm; codecs=vp8,vorbis” for attribute “type” on element “source”: Expected a token character, whitespace or a semicolon but saw “,” instead.
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