交叉轴尺寸属性则是在交叉轴方向上的长或者宽属性。
The cross size property is whichever of width or height that is in the cross dimension.
和主轴垂直的轴叫做交叉轴，它在交叉轴方向上延伸。
The axis perpendicular to the main axis is called the cross axis. It extends in the cross dimension.
灵活的盒布局模型：如何自动边缘在交叉轴方向的行为？
Flexible box layout model: How should auto margins in the cross-axis direction behave?
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