sousa-gecko/testing/web-platform/tests/css/css-ui/reference/caret-eol-001.html

<!DOCTYPE html>
<html lang=en>
<meta charset="utf-8">
<title>CSS Basic User Interface Test Reference</title>
<link rel="author" title="Florian Rivoal" href="mailto:florian@rivoal.net">
<style>
div {
    font-size: 40px;
    font-family: monospace;
    width: 5ch;
    outline: none;
    white-space: pre;
}
</style>

<p>Test passes if you see a orange text insertion caret at the end of the line below.

<div id=test>abcde</div>