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”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Element “meta” is missing one or more of the following attributes: “content”, “itemprop”, “property”.
Duplicate ID “recherche”.
Duplicate ID “keyword”.
Start tag “a” seen but an element of the same type was already open.
Stray end tag “a”.
Bad value “100%” for attribute “width” on element “iframe”: Expected a digit but saw “%” instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Bad value “100%” for attribute “height” on element “iframe”: Expected a digit but saw “%” instead.
Duplicate attribute “id”.
The “center” element is obsolete. Use CSS instead.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
The “navigation” role is unnecessary for element “nav”.
The first occurrence of ID “recherche” was here.
The first occurrence of ID “keyword” was here.
The “border” attribute is obsolete. Consider specifying “img { border: 0; }” in CSS instead.
This document appears to be written in French. Consider adding “lang="fr"” (or variant) to the “html” start tag.
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