19 lines
488 B
HTML
19 lines
488 B
HTML
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Document</title>
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</head>
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<body>
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<button onclick="start()">start</button>
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<div id="triangle"><ul>#</ul></div>
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<script>
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let triangle = "#";
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function start(){
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triangle += "#"
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document.getElementById('triangle').innerHTML += `<ul>${triangle}</ul>`
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}
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</script>
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</body>
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</html>
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