The behavior of the clear property is in essence a modification of the rules for positioning a floated element.

clear 属性的行为基本上就是对定位被浮动元素的规则的修改。

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To use relative positioning, we add a visible element - in this case, a TextView element.

要使用相对定位，可添加可见元素—在这里是一个TextView元素。

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Use absolute positioning for the element you want to animate on the page, taking it out of the layout flow of the page.

使用绝对坐标定位页面动画的元素，使它位于页面布局流之外。

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