<!DOCTYPE HTML>
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    Any copyright is dedicated to the Public Domain.
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<html><head>
<title>text-overflow: anonymous block</title>
<style type="text/css">
@font-face {
  font-family: DejaVuSansMono;
  src: url(../fonts/DejaVuSansMono.woff);
}
html,body {
    color:black; background-color:white; font-size:16px; padding:0; margin:0; font-family:DejaVuSansMono;
}

.test {
  overflow:hidden;
  width:50%;
  height:10em;

  border:1px solid black;
  white-space:pre;
  margin-left:2em;
  margin-bottom:2em;
  line-height:1.5em;
}
i {
  display:inline-block;
  height: 3em;
  width: 5em;
  background: blue;
  font-style:normal;
}
span {
  position:relative;
  background:pink;
  top:40px;
  left:16em;
}

.t1 {width:6em;}
.t2 {width:2em;}
.t3 {width:25em;}
.t4 {width:17.5em;}

input { font-family:DejaVuSansMono; }

</style>

</head><body>


<div class="test t1"><x>Some ove<m>&#x2026;</m><span><i style="display:block;">anonymous<br>block</i>and</span> unin<m>&#x2026;</m></x></div>
<div class="test t2"><x>So<m>&#x2026;</m><i style="display:block;">anonymous<br>block</i>an<m>&#x2026;</m></x></div>
<div style="position:absolute;"><div class="test t3" style="border-style:none;padding:1px"><x>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<m style="padding-left:16em">&#x2026;</m></div></div>
<div class="test t3"><x>Some overly <span>l&nbsp;&nbsp;&nbsp;</span><span><i style="display:block;">anonymous<br>block</i>and</span> uninformative sentence</x></div>
<div class="test t4"><x>Some overly <m>&#x2026;</m><span>long<i style="display:block;">anonymous<br>block</i>a&nbsp;&nbsp;</span> uninformative sentence</x></div>

<input size="4" placeholder="pla&#x2026;">
<input size="4" dir="rtl" placeholder="der&#x2026;">
<input size="4" placeholder="plaX">
<input size="4" dir="rtl" placeholder="Xder">

</body>
</html>