Tele.ch W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “cleartype” for attribute “http-equiv” on element “meta”.
A “link” element with a “sizes” attribute must have a “rel” attribute that contains the value “icon” or the value “apple-touch-icon”.
Duplicate ID “logo”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “allowtransparency” attribute on the “iframe” element is obsolete. Use CSS instead.
Duplicate ID “axelspringer_logo”.
Warnings:
The “banner” role is unnecessary for element “header”.
The first occurrence of ID “logo” was here.
Text run is not in Unicode Normalization Form C.
The “contentinfo” role is unnecessary for element “footer”.
The first occurrence of ID “axelspringer_logo” was here.
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