The French Revolution was an era of extreme political and social change. Revolutionary fervor was applied to time itself. For a brief period, the French Republic introduced a decimal time system, with each day divided into ten hours and each hour divided into one hundred minutes. It was thoroughly logical and clearly superior to the sexagesimal system.
Decimal time was a failure. Nobody used it. The same could be said for XHTML 2. The W3C rediscovered the lesson of post-revolutionary France: changing existing behavior is very, very difficult.
Keen to avoid the mistakes of the past, the WHATWG drafted a series of design principles ...