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chromium/third_party/blink/web_tests/external/wpt/css/css-inline/empty-text-node-001.html 

<!DOCTYPE html>
<html lang=en>
<meta charset="utf-8">
<title>CSS Inline test: empty text node</title>
<link rel="author" title="Jonathan Kew" href="mailto:[email protected]">
<link rel="help" title="2.1. Layout of Line Boxes" href="https://drafts.csswg.org/css-inline/#line-boxes">
<link rel="match" href="empty-text-node-001-ref.html">
<meta name="assert" content="Empty text node in a line box is treated as zero height.">
<style>
.green { color: green; }
.red { color: red; }
.testContent, .testBefore, .testAfter {
  display: inline-block;
}
div div {
  width: 50px;
  line-height: 30px;
  border: 20px solid green;
  background-color: red;
  margin: 10px;
}
.testBefore div::before {
  content: "";
}
.testAfter div::after {
  content: "";
}
.normal { white-space: normal; }
.nowrap { white-space: nowrap; }
.pre { white-space: pre; }
.prewrap { white-space: pre-wrap; }
.preline { white-space: pre-line; }
.breakspaces { white-space: break-spaces; }
</style>
<p>Test passes if the <span class=green>green</span> boxes have <span class=red>no red</span> in the middle.</p>

<div class=testContent>
  <div class=normal></div>
  <div class=nowrap></div>
  <div class=pre></div>
  <div class=prewrap></div>
  <div class=preline></div>
  <div class=breakspaces></div>
  <script>
  [...document.querySelectorAll(".testContent div")].forEach((node, i) => node.appendChild(document.createTextNode("")));
  </script>
</div>

<div class=testBefore>
  <div class=normal></div>
  <div class=nowrap></div>
  <div class=pre></div>
  <div class=prewrap></div>
  <div class=preline></div>
  <div class=breakspaces></div>
</div>

<div class=testAfter>
  <div class=normal></div>
  <div class=nowrap></div>
  <div class=pre></div>
  <div class=prewrap></div>
  <div class=preline></div>
  <div class=breakspaces></div>
</div>