这个关键字的效果取决于我们处在什么布局模式中：

元素向侧轴起点对齐。

元素向侧轴终点对齐。

The item is packed flush to each other toward the start edge of the alignment container in the appropriate axis.

The item is packed flush to each other toward the end edge of the alignment container in the appropriate axis.

元素在侧轴居中。如果元素在侧轴上的高度高于其容器，那么在两个方向上溢出距离相同。

The items are packed flush to each other toward the left edge of the alignment container. If the property’s axis is not parallel with the inline axis, this value behaves like start.

The items are packed flush to each other toward the right edge of the alignment container in the appropriate axis. If the property’s axis is not parallel with the inline axis, this value behaves like start.

The items is packed flush to the edge of the alignment container of the start side of the item, in the appropriate axis.

The item is packed flush to the edge of the alignment container of the end side of the item, in the appropriate axis.

所有元素向基线对齐。侧轴起点到元素基线距离最大的元素将会于侧轴起点对齐以确定基线。

弹性项包含外边距的交叉轴尺寸被拉升至行高

Used alongside an alignment keyword. If the chosen keyword means that the item overflows the alignment container causing data loss, the item is instead aligned as if the alignment mode were start.

Used alongside an alignment keyword. Regardless of the relative sizes of the item and alignment container and whether overflow which causes data loss might happen, the given alignment value is honored.