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Test Info:

<!DOCTYPE html>
<title>CSS-white-space test: restore collapsed whitespace</title>
<link rel="author" title="JoeDow" href="ibluegalaxy_taoj@163.com">
<link rel="match" href="reference/pre-001-ref.html">
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<style>
html {
font: 20px/1 Ahem;
}
.span {
background-color: blueviolet;
}
#target {
background-color: blue;
}
</style>
<body>
<div>
<span class="span">aa bb </span><span id="target"> target </span><span class="span">bb aa</span>
</div>
<script>
window.onload = function() {
const target = document.getElementById("target");
// force layout
target.offsetLeft;
target.style.whiteSpace = "pre";
}
</script>
</body>