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Test Info:

<body onload="document.getElementById('a').style.letterSpacing = '15ch';"></body>
<span id="a" style="position: fixed; bottom: 0pt; top: 4095em; column-width: 1px;"><span style="column-count: 1; min-height: 2097150ch; font-size-adjust: 256; width: 89px; bottom: 35875px; min-width: min-content; position: absolute; top: 33554432ch; white-space: pre-line;">
a b:
c def:
</span></span></html>