Theleanstartup.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Obsolete doctype. Expected “<!DOCTYPE html>”.
Bad value “only screen and (max-device-width: 1024px)” for attribute “media” on element “link”: Deprecated media feature “max-device-width”. For guidance, see the Deprecated Media Features section in the current Media Queries specification.
Attribute “value” not allowed on element “input” at this point.
Element “input” is missing required attribute “alt”.
Element “dl” is missing a required child element.
Bad element name “fb:like-box”: Code point “U+003A” is not allowed
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Duplicate ID “lsu_nav_book”.
Warnings:
Element name “fb:like-box” cannot be represented as XML 1.0.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
The first occurrence of ID “lsu_nav_book” was here.
This document appears to be written in English. Consider adding “lang="en"” (or variant) to the “html” start tag.
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