chromium/content/test/data/accessibility/css/pseudo-elements-separated-by-whitespace.html

<style>
span.bracketed::before {
    content: " [";
}

span.bracketed::after {
    content: "] ";
}</style>
<div title="whitespace no spans">
    <span class="bracketed">1</span> <span class="bracketed">2</span> <span class="bracketed">3</span> <span class="bracketed">4</span>
</div>
<div title="whitespace with spans">
    <span class="bracketed">1</span> <span> </span> <span> </span> <span> </span> <span><span> </span> <span> </span> <span> </span></span>
    <span class="bracketed">2</span> <span> </span> <span> </span> <span> </span> <span><span> </span> <span> </span> <span> </span></span>
    <span class="bracketed">3</span> <span> </span> <span> </span> <span> </span> <span><span> </span> <span> </span> <span> </span></span>
    <span class="bracketed">4</span> <span> </span> <span> </span> <span> </span> <span><span> </span> <span> </span> <span> </span></span>
</div>
<div title="whitespace with spans and text">
    <span class="bracketed">1</span> <span> </span><span></span><span> </span><span>abc</span> <span><span> </span> <span> </span> <span> </span></span>
    <span class="bracketed">2</span> <span> </span><span></span><span> </span><span>def</span> <span><span> </span> <span> </span> <span> </span></span>
    <span class="bracketed">3</span> <span> </span><span></span><span> </span><span>ghi</span> <span><span> </span> <span> </span> <span> </span></span>
    <span class="bracketed">4</span> <span> </span><span></span><span> </span><span>jkl</span> <span><span> </span> <span> </span> <span> </span></span>
</div>