border-block等价于border-top和border-bottom,(或border-right和border-left,取决于writing-mode)。
border-block-start等价于border-top,
border-block-end等价于border-bottom。
border-inline等价于border-left和border-right,(或border-top和border-bottom,取决于writing-mode)。
border-inline-start等价于border-left,
border-inline-end等价于border-right。
阅读详情至:
https://css-tricks.com/almanac/properties/b/border-block/
https://css-tricks.com/almanac/properties/b/border-inline/