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<h1 id='title'>Code Preview here </h1><button id='b'>Powered by - www.shmwb.in</button>
body{font-family:sans-serif;padding:20px} #title{color:blue;}
// আপনার কোড এখানে লিখুন const btn = document.getElementById('b'); if(btn) { btn.onclick = () => alert('Working!'); }