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<!DOCTYPE html>
<meta charset="UTF-8">
<title>CSS Reference</title>
<link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
<link rel="author" title="Mozilla" href="https://www.mozilla.org">
<style>
textarea {
overflow: hidden;
white-space: pre;
}
</style>
<textarea cols="10" rows="10"></textarea>
<script>
let textarea = document.querySelector("textarea");
textarea.value = ('X'.repeat(100) + '\n').repeat(100);
</script>