Errors:
Attribute “media” not allowed on element “meta” at this point.
Bad value “//fonts.googleapis.com/css?family=Libre+Baskerville:400,700,400italic|Alegreya:400italic,400,700” for attribute “href” on element “link”: Illegal character in query: “|” is not allowed.
Bad value “https://api.w.org/” for attribute “rel” on element “link”: The string “https://api.w.org/” is not a registered keyword.
Attribute “href” not allowed on element “button” at this point.
No space between attributes.
Bad value “http://twitter.com/home?status=Why%20Designers%20Don%E2%80%99t%20Want%20to%20Think%20When%20They%20Read: https://www.subtraction.com/2018/08/06/why-designers-dont-want-to-think-when-they-read/” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “http://twitter.com/home?status=What%20Is%20This%20Thing%20Called%20Design%3F: https://www.subtraction.com/2018/07/17/what-is-this-thing-called-design/” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Stray end tag “h3”.
Bad value “http://twitter.com/home?status=Movies%20Watched%2C%20June%202018: https://www.subtraction.com/2018/07/08/movies-watched-june-2018/” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “100%” for attribute “width” on element “iframe”: Expected a digit but saw “%” instead.
The “frameborder” attribute on the “iframe” element is obsolete. Use CSS instead.
The “scrolling” attribute on the “iframe” element is obsolete. Use CSS instead.
Bad value for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “http://twitter.com/home?status=Movies%20Watched%2C%20May%202018: https://www.subtraction.com/2018/06/14/movies-watched-may-2018/” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Attribute “allow” not allowed on element “iframe” at this point.
Bad value “http://twitter.com/home?status=Automating%20the%20End%20of%20Movies%20on%20Physical%20Discs: https://www.subtraction.com/2018/06/07/automating-the-end-of-movies-on-physical-discs/” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Duplicate ID “mc4wp_email”.
Bad value “http://twitter.com/home?status=LEGO%20and%20Augmented%20Reality: https://www.subtraction.com/2018/06/06/lego-and-augmented-reality/” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “http://twitter.com/home?status=Update%3A%20Recycling%20Isn%E2%80%99t%20Working: https://www.subtraction.com/2018/05/31/update-recycling-isnt-working/” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “http://twitter.com/home?status=Illustration%20in%20the%20App%20Store: https://www.subtraction.com/2018/05/22/illustration-in-the-app-store/” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Bad value “http://twitter.com/home?status=Valuable%20Lessons%20from%20Pointless%20Machines: https://www.subtraction.com/2018/05/16/valuable-lessons-from-pointless-machines/” for attribute “href” on element “a”: Illegal character in query: space is not allowed.
Warnings:
Consider avoiding viewport values that prevent users from resizing documents.
Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.
The “navigation” role is unnecessary for element “nav”.
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).
The first occurrence of ID “mc4wp_email” was here.
The “contentinfo” role is unnecessary for element “footer”.
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