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The propagation of events is directed. When a button is clicked, the event generated starts to propagate upward from the button (just like a blister comes up from the bottom of a cup, which is why it is called event bubbling), but this event always looks for whether a specific attribute has a value. For example, the click event of a button first looks for a meaningful definition of whether there is an onclick attribute on the button (i.e. The attribute points to an existing function or an executable statement), and if so, executes the function or statement; The event then continues to propagate up to the upper layer object of the button (for example, a form object or document object, which in short contains the parent object of the button). If the object also defines the onclick attribute, the value of the attribute is executed.I hope my answer can help you!Recommended Bibliography(2) Take a turn towards the ship that is right or right behind it.《七人魔法使剧场版：悠久图书馆和炼金术少女》以同名番外篇小说内容为基础改编。某日，持有魔王因子的春日触碰到莉莉斯的魔导书「赫尔墨斯外典」的瞬间，出现了一位神秘少女莉莉姆，而同时世界也产生了异变……禁忌的悠久图书馆和想要毁灭世界的魔王出现了！吕文心的办公室中，打印机唰唰的响，然后一张张布满文字的纸从打印机中出来。女主角的名字将是阿拉塔·娜露，同样是13岁，是与青一同成长的青梅竹马。娜露因为童年时的事故而使拥有”ユタ”的力量(犹达，是日本冲绳以占卜为职业的灵媒师的名称)的眼睛醒觉。娜露有能够听懂珊瑚岩心声的特异功能，这是因为珊瑚岩的一部分在她体内成长，从某种程度上来说她和珊瑚岩存在部分融合，但正是因为这样，导致她自小身体虚弱，需要把氧气放入在手上的吸氧器，现与父亲、妹妹及祖母一同生活中。