W3School TIY Editor
W3School 在线教程
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暗黑模式
运行代码
<!DOCTYPE html> <html> <body> <p id="Demo">This is paragraph 1.</p> <p id="demo">This is paragraph 2.</p> <script> // Only parapraph 2 will be overwritten document.getElementById("demo").innerHTML = "HELLO."; </script> </body> </html>