文本框会在光标短暂停留时弹出，并会在特定时间过后、鼠标从此 HTML 元素移出或单击了某键的情况下突然消失。
They pop into view after a short pause in cursor movement, and abruptly disappear after some arbitrary time elapses, or the cursor moves away from the HTML element, or a key is pressed.
前者是当鼠标移动到一个新的元素上时发生，而后者是当鼠标移出绑定对象时发生。
The former occurs when the mouse is moved onto a new element. The latter fires only if the mouse is moved out of the boundaries of an object.
这个工具提示会跟随鼠标的移动，即使在淡入和淡出期间，而且当光标从HTML元素移出然后又移回此元素时，淡入淡出会反转方向。
The tooltip follows the cursor as it moves, even as it fades in and out, and the fading will reverse direction when the cursor moves away from the HTML element, or back over it.
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