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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Reference</title>
<style>
.clamp {
line-clamp: auto;
max-height: 3lh;
font: 20px / 20px monospace;
width: 10ch;
background: yellow;
}
.line-box-sizer {
display: inline-block;
width: 1ch;
height: 2lh;
background: orange;
}
</style>
<div class="clamp">
Line 1
<div>
Nested
<span class="line-box-sizer"></span>
line<br>
Nested line
</div>
Line 4
</div>