[1] Document Structure – SVG 1.1 (Second Edition) ( ( 版)) <http://www.w3.org/TR/2011/REC-SVG11-20110816/struct.html#InterfaceSVGDocument>
[2] Re: DOM 4 request ( (Dirk Schulze 著, 版)) <http://lists.w3.org/Archives/Public/www-dom/2013JanMar/0180.html>
[3] Remove requirement for SVGDocument property on the Document interface… ( (nikosandronikos著, )) <https://github.com/w3c/svgwg/commit/10f8d72c4c627deaa8b796e7f8651bcc5b1dbd0f>