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- <!DOCTYPE HTML>
- <html>
- <head>
- <meta charset="utf-8">
- <title>removeEventListener</title>
- </head>
- <body>
- <input id="elem">
- <script>
- let elem = document.getElementById('elem');
- elem.classList.add("valid" );
- </script>
- </body>
- </html>
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