Onlinecharttool.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A document must not include both a “meta” element with an “http-equiv” attribute whose value is “content-type”, and a “meta” element with a “charset” attribute.
Bad value “ua” for attribute “hreflang” on element “link”: The language subtag “ua” is not a valid ISO language part of a language tag.
A “link” element with a “sizes” attribute must have a “rel” attribute that contains the value “icon” or the value “apple-touch-icon”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Attribute “addthis:url” not allowed on element “div” at this point.
Bad value “true” for attribute “async” on element “script”.
Warnings:
Attribute “addthis:url” is not serializable as XML 1.0.
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