W3School TIY Editor
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<!DOCTYPE html> <html> <style> #myDIV { height: 250px; width: 400px; padding: 10px; margin: 15px; border-top: 15px solid black; border-left: 10px solid red; background-color: lightblue; } </style> <body> <h1>Element 对象</h1> <h2>clientTop 和 clientLeft 属性</h2> <p>显示 myDIV 的上边框和左边框的宽度：</p> <div id="myDIV"> <p id="demo"></p> </div> <script> const element = document.getElementById("myDIV"); let text = "clientTop: " + element.clientTop + "px<br>"; text += "clientLeft: " + element.clientLeft + "px"; document.getElementById("demo").innerHTML = text; </script> </body> </html>