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”.
Element “div” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Element “style” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Attribute “kvideoid” not allowed on element “span” at this point.
Duplicate ID “course-figure”.
Duplicate ID “icon-collect2”.
Duplicate ID “icon-collect3”.
Duplicate ID “icon-collect”.
No space between attributes.
Bad value “” for attribute “name” on element “select”: Must not be empty.
Element “a” not allowed as child of element “ul” in this context. (Suppressing further errors from this subtree.)
Duplicate attribute “class”.
Stray end tag “input”.
Attribute “name” not allowed on element “div” at this point.
Duplicate attribute “type”.
Attribute “realtype” not allowed on element “input” at this point.
Attribute “value” not allowed on element “div” at this point.
Duplicate ID “formhash”.
Attribute “echo” not allowed on element “input” at this point.
Attribute “formhash();}” not allowed on element “input” at this point.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The document is not mappable to XML 1.0 due to two consecutive hyphens in a comment.
The first occurrence of ID “course-figure” was here.
The first occurrence of ID “icon-collect2” was here.
The first occurrence of ID “icon-collect3” was here.
The first occurrence of ID “icon-collect” was here.
The first occurrence of ID “formhash” was here.
Attribute “formhash();}” is not serializable as XML 1.0.
The “language” attribute on the “script” element is obsolete. You can safely omit it.
This document appears to be written in Simplified Chinese. Consider adding “lang="zh-hans"” (or variant) to the “html” start tag.
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