http://www.w3schools.com/xhtml/xhtml_html.asp
HTML Elements and Valid Doctypes
http://www.w3schools.com/tags/ref_html_dtd.asp
HTML 4.01 / XHTML 1.0 Reference
http://www.w3schools.com/tags/default.asp
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ByadminCSS-Tricks. https://css-tricks.com/ Dive Into HTML5. http://diveintohtml5.info/ Learn to code | Codecademy. https://www.codecademy.com/ Mozilla Developer Network. https://developer.mozilla.org/el/ https://developer.mozilla.org/el/docs/Web Stack Overflow. http://stackoverflow.com/ Tutorialsοpoint. http://www.tutorialspoint.com/ W3Schools Online Web Tutorials. http://www.w3schools.com/ World Wide Web Consortium (W3C). (χ.χ.). http://www.w3.org/ Κοινοποίηση