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HTML
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<div class="pw"> <input id="pw" type="password" placeholder="Password" value="fastui@123" /> <span class="on"> <svg viewBox="0 0 576 512" fill="currentColor"> <path d="M160 256C160 185.3 217.3 128 288 128C358.7 128 416 185.3 416 256C416 326.7 358.7 384 288 384C217.3 384 160 326.7 160 256zM288 336C332.2 336 368 300.2 368 256C368 211.8 332.2 176 288 176C287.3 176 286.7 176 285.1 176C287.3 181.1 288 186.5 288 192C288 227.3 259.3 256 224 256C218.5 256 213.1 255.3 208 253.1C208 254.7 208 255.3 208 255.1C208 300.2 243.8 336 288 336zM95.42 112.6C142.5 68.84 207.2 32 288 32C368.8 32 433.5 68.84 480.6 112.6C527.4 156 558.7 207.1 573.5 243.7C576.8 251.6 576.8 260.4 573.5 268.3C558.7 304 527.4 355.1 480.6 399.4C433.5 443.2 368.8 480 288 480C207.2 480 142.5 443.2 95.42 399.4C48.62 355.1 17.34 304 2.461 268.3C-.8205 260.4-.8205 251.6 2.461 243.7C17.34 207.1 48.62 156 95.42 112.6z"/> </svg> </span> <span class="off"> <svg viewBox="0 0 640 512" fill="currentColor"> <path d="M150.7 92.77C195 58.27 251.8 32 320 32C400.8 32 465.5 68.84 512.6 112.6C559.4 156 590.7 207.1 605.5 243.7C608.8 251.6 608.8 260.4 605.5 268.3C592.1 300.6 565.2 346.1 525.6 386.7L630.8 469.1C641.2 477.3 643.1 492.4 634.9 502.8C626.7 513.2 611.6 515.1 601.2 506.9L9.196 42.89C-1.236 34.71-3.065 19.63 5.112 9.196C13.29-1.236 28.37-3.065 38.81 5.112L150.7 92.77zM189.8 123.5L235.8 159.5C258.3 139.9 287.8 128 320 128C390.7 128 448 185.3 448 256C448 277.2 442.9 297.1 433.8 314.7L487.6 356.9C521.1 322.8 545.9 283.1 558.6 256C544.1 225.1 518.4 183.5 479.9 147.7C438.8 109.6 385.2 79.1 320 79.1C269.5 79.1 225.1 97.73 189.8 123.5zM404.3 414.5L446.2 447.5C409.9 467.1 367.8 480 320 480C239.2 480 174.5 443.2 127.4 399.4C80.62 355.1 49.34 304 34.46 268.3C31.18 260.4 31.18 251.6 34.46 243.7C44 220.8 60.29 191.2 83.09 161.5L120.8 191.2C102.1 214.5 89.76 237.6 81.45 255.1C95.02 286 121.6 328.5 160.1 364.3C201.2 402.4 254.8 432 320 432C350.7 432 378.8 425.4 404.3 414.5z"/> </svg> </span> </div>
CSS
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.pw{position:relative;display:inline-block} .pw input{padding:12px 40px 12px 12px;border:1px solid #9ca3af;border-radius:6px;transition:.2s} .pw input:focus{border-color:#1dc071;box-shadow:0 2px 5px rgba(0,0,0,.1)} .pw span{position:absolute;top:50%;right:10px;transform:translateY(-50%);color:#9ca3af;cursor:pointer} .pw svg{height:18px} .on.hide,.off{display:none} .off.show{display:block}
JS
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const pw=document.querySelector('#pw'), on=document.querySelector('.on'), off=document.querySelector('.off'); on.onclick=()=>{pw.type='text';on.classList.add('hide');off.classList.add('show')}; off.onclick=()=>{pw.type='password';on.classList.remove('hide');off.classList.remove('show')};