Rth.info W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Internal encoding declaration “iso-8859-1” disagrees with the actual encoding of the document (“utf-8”).
Bad value “iso-8859-1” for attribute “charset” on element “meta”: “iso-8859-1” is not a preferred encoding name. The preferred label for this encoding is “windows-1252”.
A document must not include both a “meta” element with an “http-equiv” attribute whose value is “content-type”, and a “meta” element with a “charset” attribute.
Bad value “screen,print,projection” for attribute “media” on element “link”: Deprecated media type “projection”. For guidance, see the Media Types section in the current Media Queries specification.
Duplicate ID “navbarDropdown”.
Bad value “” for attribute “srcset” on element “img”: Must contain one or more image candidate strings.
The “marginwidth” attribute on the “iframe” element is obsolete. Use CSS instead.
The “marginheight” attribute on the “iframe” element is obsolete. Use CSS instead.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Saw “</>”. Probable causes: Unescaped “<” (escape as “<”) or mistyped end tag.
Stray end tag “a”.
Warnings:
The “navigation” role is unnecessary for element “nav”.
The first occurrence of ID “navbarDropdown” was here.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
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