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<!DOCTYPE html>
<style>
p { font: 16px monospace; white-space: pre; }
span { background-color: lime }
</style>
<p><span>a b</span></p>
<p><span>a b</span></p>
<p><span>a b</span></p>
<p><span> a b </span></p>
<p><span>a </span></p>
<p><span> </span></p>
<p><span> </span></p>
<p><span>. </span></p>
<p><span>a b</span></p>
<p><span>a b</span></p>
<p><span> a b </span></p>
<p><span>a </span></p>
<p><span> </span></p>
<p><span> </span></p>
<p><span>. </span></p>