Errors:
Attribute “xmlns:esi” not allowed here.
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 “” for attribute “tabindex” on element “button”: The empty string is not a valid integer.
Bad value “ 480” for attribute “width” on element “iframe”: Expected a digit but saw “ ” instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
An “img” element must have an “alt” attribute, except under certain conditions. For details, consult guidance on providing text alternatives for images.
Bad value for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “https://twitter.com/intent/tweet?url=https://twitter.com/uniofjyvaskyla/status/1099998707083239424&title=4-6 tohtorikoulutettavaa / Informaatioteknologian tiedekunta ” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “https://www.linkedin.com/shareArticle?url=https://twitter.com/uniofjyvaskyla/status/1099998707083239424&title=4-6 tohtorikoulutettavaa / Informaatioteknologian tiedekunta ” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “https://pinterest.com/pin/create/bookmarklet/?url=https://twitter.com/uniofjyvaskyla/status/1099998707083239424&description=4-6 tohtorikoulutettavaa / Informaatioteknologian tiedekunta ” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “https://twitter.com/intent/tweet?url=https://twitter.com/uniofjyvaskyla/status/1099998704897908737&title=4-6 Doctoral students / Faculty of Information Technology ” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “https://www.linkedin.com/shareArticle?url=https://twitter.com/uniofjyvaskyla/status/1099998704897908737&title=4-6 Doctoral students / Faculty of Information Technology ” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “https://pinterest.com/pin/create/bookmarklet/?url=https://twitter.com/uniofjyvaskyla/status/1099998704897908737&description=4-6 Doctoral students / Faculty of Information Technology ” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
The value of the “for” attribute of the “label” element must be the ID of a non-hidden form control.
Warnings:
Attribute with the local name “xmlns:esi” is not serializable as XML 1.0.
Attribute “aria-hidden” is unnecessary for elements that have attribute “hidden”.
Article lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all articles.
The “type” attribute is unnecessary for JavaScript resources.
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