[1] Web Applications 1.0 r5695 Define how we create a 'specified CSS element reference identifier'. This maybe should move from HTML to CSSOM. ( (2010-12-02 09:09:00 +09:00 版)) http://html5.org/tools/web-apps-tracker?from=5694&to=5695

[2] Web Applications 1.0 r7722 Try to define order for supported property names. This is not based on testing. If there are compatibility constraints here that prevent implementing this as specced, please let me know. ( (2013-02-13 09:03:00 +09:00 版)) http://html5.org/tools/web-apps-tracker?from=7721&to=7722

[3] Remove unimplemented document.cssElementMap · whatwg/html@797b4d2 (2015-10-18 23:25:30 +09:00 版) https://github.com/whatwg/html/commit/797b4d273955a0fe3cc2e2d0ca5d578f37c0f126