[1] IE、エレメント生成直後のcurrentStyleはnull - 実用 ( 版) <http://d.hatena.ne.jp/brazil/20061021/1161360716>
[2] Re: Should IE drop currentStyle/ runtimeStyle? ( (Anne van Kesteren 著, 版)) <http://lists.w3.org/Archives/Public/www-style/2009Oct/0046.html>
[3] A break from the past, part 2: Saying goodbye to ActiveX, VBScript, attachEvent… | Microsoft Edge Dev Blog ( 版) <http://blogs.windows.com/msedgedev/2015/05/06/a-break-from-the-past-part-2-saying-goodbye-to-activex-vbscript-attachevent/>