Upstreamsystems.com W3C HTML Markup Validation
HTML markup errors and warnings
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Errors:
Bad value “” for attribute “media” on element “link”: Media query ended prematurely.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Bad value “” for attribute “href” on element “link”: Must be non-empty.
Attribute “href” not allowed on element “span” at this point.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
Bad value “mailto: info-ng@upstreamsystems.com” for attribute “href” on element “a”: Illegal character in scheme data: space is not allowed.
Warnings:
Consider using the “h1” element as a top-level heading only (all “h1” elements are treated as top-level headings by many screen readers and other tools).
Greece GR