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<!DOCTYPE html> <html> <body> <h1>文档 designMode 属性</h1> <p>designMode 属性设置文档是否可编辑。</p> <p>该文件是可编辑的！</p> <p>尝试编辑此文档中的任何文本。</p> <script> document.designMode = "on"; </script> </body> </html>