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<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1"> <style> .container { position: relative; width: 100%; overflow: hidden; padding-top: 100%; /* 1:1 宽高比 */ } .responsive-iframe { position: absolute; top: 0; left: 0; bottom: 0; right: 0; width: 100%; height: 100%; border: none; } </style> </head> <body> <h1>响应式 Iframe</h1> <h2>保持宽高比 1:1</h2> <p>调整窗口大小可查看效果。</p> <div class="container"> <iframe class="responsive-iframe" src="//player.bilibili.com/player.html?isOutside=true&aid=763101381&bvid=BV1964y1b7LZ&cid=749014309&p=1"></iframe> </div> </body> </html>