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埋め込み要素系 source 属性 (XFrames)

`style` 要素 `source` 属性 (XFrames)

[1] XFrames (2010-12-17 00:45:08 +09:00 版) <http://www.w3.org/TR/2010/NOTE-xframes-20101216/#s_style-element>

`frame` 要素 `source` 属性 (XFrames)

[2] XFrames (2010-12-17 00:45:08 +09:00 版) <http://www.w3.org/TR/2010/NOTE-xframes-20101216/#s_frame-element>

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