"Elastic tabstops - a better way to indent and align code". nickgravgaard.com. Retrieved 23 March 2018. ↑ See Character encodings in HTML#HTML character references ↑ "Character Entity Reference Chart". dev.w3.org. Retrieved 23 March 2018. ↑ "CSS 3 tab-size property W3 specification". ↑ "CSS tab-size property on Mozilla Developer Network". ↑ "Extensible Markup Language (XML) 1.0" (5th ed.).