Oegb.at W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Almost standards mode doctype. Expected “<!DOCTYPE html>”.
Bad value “de_AT” for attribute “lang” on element “html”: The language subtag “de_at” is not a valid language subtag.
A document must not include more than one “meta” element with its “name” attribute set to the value “description”.
Attribute “alt” not allowed on element “input” at this point.
Bad value “{wenn rememberme angehakt dann true sonst false}” for attribute “aria-checked” on element “input”.
Attribute “type” not allowed on element “iframe” at this point.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
Duplicate attribute “value”.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Warnings:
The “button” role is unnecessary for element “input” whose type is “submit”.
The “name” attribute is obsolete. Consider putting an “id” attribute on the nearest container instead.
Empty heading.
The “checkbox” role is unnecessary for element “input” whose type is “checkbox”.
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