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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.喂，江成海。5.10 Frequent headache is unqualified.顾小玉有些无力地白了付宇锋一眼，她觉得要不要向老板建议，辞了付宇锋，免得把整个公司的平均智商严重拉低。咱们就来好好商议，一定要把婚事办得风风光光的……他这一番话说的，刘家人听了十分舒坦，且有面子。二十年前一宗手术，令两名儿科专科实习医生况丛昕（马国明饰）与许甘枫（郑嘉颖饰）决裂。 时日过去，丛昕当上顶尖医院“安妮医院”的小儿外科顾问医生，而一心捍卫生命的甘枫却于一间二线医院落脚，两人本来各走各路，岂料因一宗肝移植手术而再次碰头，命运亦从此连上。Ctrl + B: grid capture mode control (F9)