W3School TIY Editor
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<!DOCTYPE html> <html> <head> <style> :popover-open { width: 150px; height: 150px; position: absolute; inset: unset; bottom: 25px; left: 25px; margin: 0; color: maroon; background-color: orange; font-size: 25px; } </style> </head> <body> <h1>:popover-open 演示</h1> <button popovertarget="myPopover">打开弹出框</button> <div popover id="myPopover">你好！</div> </body> </html>