Цитата:
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A click is defined as a mousedown and mouseup over the same screen location.
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Цитата:
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A pointing device button is clicked over an element. The definition of a click depends on the environment configuration; i.e. it may depend on the screen location or the delay between the press and release of the pointing device button. In any case, the event target must be the same between the mousedown, mouseup, and click.
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Обратите внимание на различие в определении щелчка между действующей документацие DOM2 и черновиком DOM3: в DOM2 щелчок — mousedown и mouseup в одном и том же месте, в DOM3 — над одним и тем же элементом.