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[Word 10] (名無しさん)
[2] Behaviors, Event Handlers and builtin HTML Controls <http://www.terrainformatica.com/htmlayout/behaviors.whtm> (名無しさん [sage])
[4] Editorial: always state invalid value default (GloverDonovan著, ) <https://github.com/whatwg/html/commit/7e941ae96b264d4743ea0afac00c3b3209ab0cde>