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chromium/third_party/blink/web_tests/external/wpt/css/css-text/tab-size/tab-size-spacing-003-ref.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Text level 3 Test reference</title>
<link rel="author" title="Jonathan Kew" href="mailto:[email protected]">
<style>
div {
  font-family: monospace; /* so we can compare tab with a count of preserved spaces */
  white-space: pre;
}
</style>

<p>Test passes if the "1"s all line up vertically:
<div>1  2  1  2  1  2  1
1     1     1     1
1     1     1     1</div>