<ol> - HTML | MDN
http://devdoc.net/web/developer.mozilla.org/en-US/docs/Web/HTML/Element/ol.html
WEBJun 28, 2017 · The HTML <ol> element represents an ordered list of items, typically rendered as a numbered list. Flow content, and if the <ol> element's children include at least one <li> element, palpable content. Zero or more <li> elements, which in turn often contain nested <ol> or <ul> elements.
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