Todayonhistory.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.
The “language” attribute on the “script” element is obsolete. You can safely omit it.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
This document appears to be written in Simplified Chinese. Consider adding “lang="zh-hans"” (or variant) to the “html” start tag.
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”.
No space between attributes.
Bad value “Cache-Control” for attribute “http-equiv” on element “meta”.
Attribute “name” not allowed on element “script” at this point.
Element “input” with attribute “type” whose value is “button” must have non-empty attribute “value”.
Attribute “tdata” not allowed on element “span” at this point.
Element “script” must not have attribute “charset” unless attribute “src” is also specified.
Element “a” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
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