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CSS border-block 属性
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<!DOCTYPE html> <html> <head> <style> h1, h2, div { background-color: lightgreen; } h1 { border-block: 5px solid red; } h2 { border-block: 4px dotted blue; } div { border-block: double; } </style> </head> <body> <h1>A heading with a solid red border in the block direction</h1> <h2>A heading with a dotted blue border in the block direction</h2> <div>A div element with a double border in the block direction.</div> </body> </html>