换句话说，所有不能帮助布局的视觉元素都将会伤害到布局。
In other words, any visual element that is not helping your layout ends up hurting it.
当你点击任何渲染中的视觉元素时，他们会在DOM中显示被选中。
As you click on any visual elements in the rendering, they'll appear selected in the DOM.
这种两个方框的对比方式可以很好用来表现元素之间的视觉差异。
This sort of contrast between the two boxes is a great way of setting visual precedence between elements.
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