decorator
[1] Introduction to Web Components ( (2012-05-19 05:52:01 +09:00 版)) http://www.w3.org/TR/components-intro/#decorator-section
[2] Introduction to Web Components ( (2013-06-05 15:53:16 +09:00 版)) http://www.w3.org/TR/2013/WD-components-intro-20130606/#decorator-section