使用flex布局的元素，在HTML里能看到flex的小图标，如下图所示：
点击flex小图标，可以把flex container及其元素的轮廓高亮显示：
在这个例子里，a标签既是一个flex item，也作为flex container，装载了button和span两个字元素。
单击flex这个小图标可以高亮对应flex元素：
Flex container面板下一些属性的说明。
- A diagram visualizing the sizing of the flex item
- Content Size - the size of the component without any restraints imposed on it by its parent
- Flexibility - how much a flex item grew or shrunk based on its flex-grow value when there is extra free space or its flex-shrink value when there is not enough space
- Minimum Size (only appears when an item is clamped to its minimum size) - the minimum content size of a flex item when there is no more free space in the flex container
- Final Size - the size of the flex item after all sizing constraints imposed on it have been applied (based on the values of flex-grow, flex-shrink and flex-basis)
developer.mozilla.org/en-US/docs/…
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