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<style>
button {
position: absolute;
width: 100px;
height: 20px;
margin: 0;
}
body, html {
margin: 0;
padding: 0;
height: 100%;
width: 100%;
position: relative;
}
div {
position: absolute;
left: 0;
top: 0;
right: 0;
bottom: 0;
}
#btn0 { right: 0px; top: 0; }
#btn1 { right: -10px; top: 25px; }
#btn2 { right: -20px; top: 50px; }
#btn3 { right: -30px; top: 75px; }
#btn4 { right: -40px; top: 100px; }
#btn5 { right: -50px; top: 125px; }
#btn6 { right: -60px; top: 150px; }
#btn7 { right: -70px; top: 175px; }
#btn8 { right: -80px; top: 200px; }
#btn9 { right: -90px; top: 225px; }
#btn10 { right: -100px; top: 250px; }
</style>
<div>
<button id=btn0>0</button>
<button id=btn1>1</button>
<button id=btn2>2</button>
<button id=btn3>3</button>
<button id=btn4>4</button>
<button id=btn5>5</button>
<button id=btn6>6</button>
<button id=btn7>7</button>
<button id=btn8>8</button>
<button id=btn9>9</button>
<button id=btn10>10</button>
</div>
<script>
window.addEventListener('DOMContentLoaded', () => {
for (const button of Array.from(document.querySelectorAll('button')))
button.addEventListener('click', () => console.log('button #' + button.textContent + ' clicked'), false);
}, false);
</script>
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