[1] HTMLFrameSetElement
HTMLFrameSetElement
border
borderColor
cols
frameBorder
frameSpacing
name
onafterprint
HTMLFrameSetElement2
onbeforeprint
onbeforeunload
onload
onunload
rows
[2] Fix which built-in elements can be customized (domenic著, 2016-11-17 01:31:58 +09:00) <https://github.com/whatwg/html/commit/7d6b279b0d2bc30752700155a043b65441fe12e3>