Book118.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Almost standards mode doctype. Expected “<!DOCTYPE html>”.
Attribute “xmlns:xn” not allowed here.
Bad value “Cache-Control” for attribute “http-equiv” on element “meta”.
No space between attributes.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Duplicate ID “zhike”.
Duplicate ID “upUl”.
Warnings:
Attribute with the local name “xmlns:xn” is not serializable as XML 1.0.
The “type” attribute is unnecessary for JavaScript resources.
The “language” attribute on the “script” element is obsolete.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The “border” attribute is obsolete.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.
The first occurrence of ID “zhike” was here.
The first occurrence of ID “upUl” was here.
Consider adding a “lang” attribute to the “html” start tag to declare the language of this document.
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