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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
<head>
<title>test reference</title>
<style type="text/css">
div {
margin: 1em;
font-family: monospace;
page-break-inside: avoid;
}
div p {
margin: 0;
}
.control span {
background: blue;
color: blue;
}
.test span {
background: orange;
color: orange;
}
.ws-pre p {
white-space: pre;
}
</style>
</head>
<body>
<p>In each of the following pairs, the blue and orange bars must have equal lengths.</p>
<!-- ZERO-WIDTH SPACE -->
<div class="ws-normal">
<p class="control"><span>A​​​​B</span></p>
<p class="test"><span>A​​​​B</span></p>
</div>
<div class="ws-pre">
<p class="control"><span>A​​​​B</span></p>
<p class="test"><span>A​​​​B</span></p>
</div>
<!-- ZERO-WIDTH NO-BREAK SPACE -->
<div class="ws-normal">
<p class="control"><span>AB</span></p>
<p class="test"><span>AB</span></p>
</div>
<div class="ws-pre">
<p class="control"><span>AB</span></p>
<p class="test"><span>AB</span></p>
</div>
<!-- ZERO-WIDTH NON-JOINER -->
<div class="ws-normal">
<p class="control"><span>A‌‌‌‌B</span></p>
<p class="test"><span>A‌‌‌‌B</span></p>
</div>
<div class="ws-pre">
<p class="control"><span>A‌‌‌‌B</span></p>
<p class="test"><span>A‌‌‌‌B</span></p>
</div>
<!-- ZERO-WIDTH JOINER -->
<div class="ws-normal">
<p class="control"><span>A‍‍‍‍B</span></p>
<p class="test"><span>A‍‍‍‍B</span></p>
</div>
<div class="ws-pre">
<p class="control"><span>A‍‍‍‍B</span></p>
<p class="test"><span>A‍‍‍‍B</span></p>
</div>
</body>
</html>