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[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
[6] csswg: changeset 2219:d4c7d73ae7f7 (2012-06-12 14:05:23 +09:00 版) http://dvcs.w3.org/hg/csswg/rev/d4c7d73ae7f7
[5] csswg: changeset 2220:a1bc4b1287b1 (2012-06-12 14:04:51 +09:00 版) http://dvcs.w3.org/hg/csswg/rev/a1bc4b1287b1
[9] csswg: changeset 5153:8a651e76cd87 (2012-06-12 14:13:24 +09:00 版) http://dvcs.w3.org/hg/csswg/rev/8a651e76cd87
[8] csswg: changeset 5178:f057bc3959f9 (2012-06-12 14:12:38 +09:00 版) http://dvcs.w3.org/hg/csswg/rev/f057bc3959f9
[2] IRC logs: freenode / #whatwg / 20101202 ( (2010-12-31 14:34:30 +09:00 版)) http://krijnhoetmer.nl/irc-logs/whatwg/20101202
[7] csswg: changeset 5153:8a651e76cd87 (2012-06-12 14:06:16 +09:00 版) http://dvcs.w3.org/hg/csswg/rev/8a651e76cd87

[10] >>9 で element() を使った cssElementMap への参照は将来追加するかもという注記の元削除されています。

[11] IRC logs: freenode / #whatwg / 20121129 ( (2012-12-09 19:48:18 +09:00 版)) http://krijnhoetmer.nl/irc-logs/whatwg/20121129#l-93

[12] 714507 – [CSS3] content:element() in any element or HTML5 Canvas in IMG element (2015-10-17 11:17:31 +09:00 版) https://bugzilla.mozilla.org/show_bug.cgi?id=714507

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

[14] [css-images-3] Remove leftover reference to the element() function (frivoal著, 2017-02-27 16:14:20 +09:00) https://github.com/w3c/csswg-drafts/commit/7b6dc4f8ed19a08c5021b858d0bf58c0c2283be4

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