The content edge or inner edge surrounds the rendered content of the element.
content edge或inner edge围绕所呈现的元素内容。
For other elements, if the element's position is' relative 'or' static ', the containing block is formed by the content edge of the nearest block container ancestor box.
对于其他元素来说,假如元素的定位方式是相对定位或者static定位,那么它的包含块是由最近的块级祖先元素的内容边缘构成。
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