[1] 92071 – HTMLSpanElement does not inherit from Core Objects ( (2012-06-22 09:09:43 +09:00 版)) <https://bugzilla.mozilla.org/show_bug.cgi?id=92071>

[2] 573357 – Use the HTMLElement interface for more elements ( (2012-06-22 09:12:46 +09:00 版)) <https://bugzilla.mozilla.org/show_bug.cgi?id=573357>