- https://www.w3.org/
- https://tools.ietf.org/
- https://www.w3.org/TR/html4/references.html
- https://www.w3.org/TR/html5/
- https://www.w3.org/TR/html/
- https://www.w3.org/TR/html-markup/references.html
- https://developer.mozilla.org/en-US/docs/Web
- https://developers.google.com/web/
- https://html.spec.whatwg.org/multipage/syntax.html#syntax-tag-omission
- https://msdn.microsoft.com/en-us/library/ff921348.aspx
- http://rabbit.eng.miami.edu/info/htmlchars.html
- https://html.spec.whatwg.org/
- https://paulirish.github.io/web-feature-availability/
- https://fonts.google.com/
- https://developers.google.com/fonts/
- http://typecast.com/
- https://femmebot.github.io/google-type/
- RFC-2616 Hypertext Transfer Protocol -- HTTP/1.1
- RFC-2854 The 'text/html' media type
- RFC-7540 Hypertext Transfer Protocol Version 2 (HTTP/2)
- http://www.w3schools.com/
- http://learn.shayhowe.com/advanced-html-css/
- https://www.impressivewebs.com/
- https://css-tricks.com/
- http://html5doctor.com/
- http://diveintohtml5.info/
- http://html5demos.com/
- https://github.com/joshuagatcke/HTML-KickStart
- https://github.com/murtaugh/HTML5-Reset
- https://html5boilerplate.com/