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http://www.w3.org/TR/html5/grouping-content.html#the-ol-element 4.4.5 The ol element The type attribute seems to be a presentational device that ought to be replaced by CSS, especially given that all major browsers support the styles described when they are specified by use of list-style-type (see http://www.w3.org/International/tests/repository/css3-counter-styles/predefined-styles/results-cstyles#simplenumeric for the roman styles). If it is truly presentational, perhaps we should deprecate it. Or is this intentionally kept as a way to allow a minimal set of 'semantically' differentiated lists, that will work if CSS is not present? If so, perhaps we should add a brief note to explain that, and mention that you can do much more using CSS.
https://github.com/w3c/html/issues/341