仕様書

[2] CSS3 Generated and Replaced Content Module ( (2003-05-15 21:54:58 +09:00 版)) http://www.w3.org/TR/2003/WD-css3-content-20030514/#block

[3] CSS Generated Content Module Level 3 ( (2011-04-21 02:28:30 +09:00 版)) http://dev.w3.org/csswg/css3-content/#block-markers-the-marker-pseudo-element

[4] NOTE-css-potential-19970819 ( (2000-03-13 23:37:56 +09:00 版)) http://www.w3.org/TR/NOTE-css-potential-19970819#elementId=1030143

[5] Web Applications 1.0 r8663 Rename 'list marker' and 'scope marker' to just 'marker' for consistency and clarity, and cross-reference them all ( (2014-06-09 01:48:00 +09:00 版)) http://html5.org/r/8663

[6] Need a way to styling the disclosure triangle of the <details> (or <summary>) element · Issue #722 · whatwg/html (2016-03-01 11:38:37 +09:00 版) https://github.com/whatwg/html/issues/722