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<!DOCTYPE html> <html lang="en"> <body> <pre id="output"></pre> <script> var str = 'hello world'; var startIndex = 3; var endIndex = 10; var result = str.substring(startIndex, endIndex); var output = ''; output += 'Original String : ' + str; output += '\n\nSubstring : ' + result; document.getElementById('output').innerHTML = output; </script> </body> </html>