Document Object ModelEventコンストラクターEvent()インスタンスプロパティbubblescancelablecancelBubble 非推奨 composedcurrentTargetdefaultPreventedeventPhaseexplicitOriginalTarget Non-standard isTrustedoriginalTarget Non-standard returnValue 非推奨 srcElement 非推奨 targettimeStamptypeインスタンスメソッドcomposedPath()initEvent() 非推奨 preventDefault() stopImmediatePropagation()stopPropagation()DOM に関連するページAbortControllerAbortSignalAbstra
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