18183.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
A “meta” element with an “http-equiv” attribute whose value is “X-UA-Compatible” must have a “content” attribute with the value “IE=edge”.
Bad value “Cache-Control” for attribute “http-equiv” on element “meta”.
Bad value “only screen and(max-width: 640px)” for attribute “media” on element “link”: Expected a letter or whitespace but saw “(” instead.
Attribute “onselectstart” not allowed on element “body” at this point.
Saw “"” when expecting an attribute name. Probable cause: “=” missing immediately before.
Attribute “"” not allowed on element “li” at this point.
Element “img” is missing required attribute “src”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “p” not allowed as child of element “h4” in this context. (Suppressing further errors from this subtree.)
Element “ul” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Warnings:
Empty heading.
Attribute “"” is not serializable as XML 1.0.
The “language” attribute on the “script” element is obsolete. You can safely omit it.
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