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<!DOCTYPE html>
<style>
p { font: 16px monospace; white-space: preserve-spaces; }
span { background-color: lime }
</style>
<p><span>a b</span></p>
<p><span>a&#xA;b</span></p>
<p><span>a &#xA; b</span></p>
<p><span>&#xA; a&#xA; b&#xA;</span></p>
<p><span>a </span></p>
<p><span>&#xA;&#xA;&#xA;</span></p>
<p><span> &#xA;&#xA;&#xA; </span></p>
<p><span>. &#xA;</span></p>
<p><span>a&#x9;b</span></p>
<p><span>a &#x9; b</span></p>
<p><span>&#x9; a&#x9; b&#x9;</span></p>
<p><span>a </span></p>
<p><span>&#x9;&#x9;&#x9;</span></p>
<p><span> &#x9;&#x9;&#x9; </span></p>
<p><span>. &#x9;</span></p>