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chromium/third_party/blink/web_tests/external/wpt/css/css-text/tab-size/tab-size-block-ancestor.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Text level 3 Test: tab-size based on block ancestor's space</title>
<link rel="author" title="Jonathan Kew" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-text-3/#tab-size-property">
<link rel="match" href="tab-size-block-ancestor-ref.html">
<meta name="assert" content="tab width is based on space character in the block ancestor">
<style>
div {
    font: 16px monospace;
    white-space: pre;
    tab-size: 10;
}
.test1 span {
    font-size: 1px;
}
.test2 span {
    font-size: 10px;
}
.test3 span {
    tab-size: 5;
}
.test4 span {
    font-size: 10px;
    tab-size: 2.5;
}
b {
    font: bold 16px monospace;
}
</style>

<p>Test passes if the five “A” letters below are vertically aligned with each other.

<div>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<b>A</b><!-- indented by 10 spaces -->
</div>
<div class=test1>
<span>&#9;<b>A</b></span>
</div>
<div class=test2>
<span>&#9;<b>A</b></span>
</div>
<div class=test3>
<span>&#9;&#9;<b>A</b></span>
</div>
<div class=test4>
<span>&#9;&#9;&#9;&#9;<b>A</b></span>
</div>