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Test Info:

<!DOCTYPE html>
<style>
body {
margin: 0;
}
.container {
writing-mode: horizontal-tb;
direction: ltr;
display: inline-block;
position: relative;
margin: 20px;
border: solid 4px;
width: 40px;
height: 40px;
}
.item {
position: absolute;
background: green;
inset: 5px;
margin: 10px;
width: 30px;
height: 30px;
}
.safe {
justify-self: safe end;
}
.unsafe {
justify-self: unsafe end;
}
.rtl {
direction: rtl;
}
</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<body onload="checkLayout('.item')">
<div class="container">
<div class="item safe" style="writing-mode: horizontal-tb; direction: ltr;" data-offset-x="15"></div>
</div>
<div class="container">
<div class="item safe" style="writing-mode: horizontal-tb; direction: rtl;" data-offset-x="15"></div>
</div>
<div class="container">
<div class="item safe" style="writing-mode: veritcal-rl; direction: ltr;" data-offset-x="15"></div>
</div>
<div class="container">
<div class="item safe" style="writing-mode: vertical-rl; direction: rtl;" data-offset-x="15"></div>
</div>
<div class="container">
<div class="item safe" style="writing-mode: vertical-lr; direction: ltr;" data-offset-x="15"></div>
</div>
<div class="container">
<div class="item safe" style="writing-mode: vertical-lr; direction: rtl;" data-offset-x="15"></div>
</div>
<!-- UNSAFE -->
<br>
<div class="container">
<div class="item unsafe" style="writing-mode: horizontal-tb; direction: ltr;" data-offset-x="-5"></div>
</div>
<div class="container">
<div class="item unsafe" style="writing-mode: horizontal-tb; direction: rtl;" data-offset-x="-5"></div>
</div>
<div class="container">
<div class="item unsafe" style="writing-mode: veritcal-rl; direction: ltr;" data-offset-x="-5"></div>
</div>
<div class="container">
<div class="item unsafe" style="writing-mode: vertical-rl; direction: rtl;" data-offset-x="-5"></div>
</div>
<div class="container">
<div class="item unsafe" style="writing-mode: vertical-lr; direction: ltr;" data-offset-x="-5"></div>
</div>
<div class="container">
<div class="item unsafe" style="writing-mode: vertical-lr; direction: rtl;" data-offset-x="-5"></div>
</div>
<!-- RTL -->
<br>
<div class="container rtl">
<div class="item safe" style="writing-mode: horizontal-tb; direction: ltr;" data-offset-x="-5"></div>
</div>
<div class="container rtl">
<div class="item safe" style="writing-mode: horizontal-tb; direction: rtl;" data-offset-x="-5"></div>
</div>
<div class="container rtl">
<div class="item safe" style="writing-mode: veritcal-rl; direction: ltr;" data-offset-x="-5"></div>
</div>
<div class="container rtl">
<div class="item safe" style="writing-mode: vertical-rl; direction: rtl;" data-offset-x="-5"></div>
</div>
<div class="container rtl">
<div class="item safe" style="writing-mode: vertical-lr; direction: ltr;" data-offset-x="-5"></div>
</div>
<div class="container rtl">
<div class="item safe" style="writing-mode: vertical-lr; direction: rtl;" data-offset-x="-5"></div>
</div>
<!-- UNSAFE RTL -->
<br>
<div class="container rtl">
<div class="item unsafe" style="writing-mode: horizontal-tb; direction: ltr;" data-offset-x="15"></div>
</div>
<div class="container rtl">
<div class="item unsafe" style="writing-mode: horizontal-tb; direction: rtl;" data-offset-x="15"></div>
</div>
<div class="container rtl">
<div class="item unsafe" style="writing-mode: veritcal-rl; direction: ltr;" data-offset-x="15"></div>
</div>
<div class="container rtl">
<div class="item unsafe" style="writing-mode: vertical-rl; direction: rtl;" data-offset-x="15"></div>
</div>
<div class="container rtl">
<div class="item unsafe" style="writing-mode: vertical-lr; direction: ltr;" data-offset-x="15"></div>
</div>
<div class="container rtl">
<div class="item unsafe" style="writing-mode: vertical-lr; direction: rtl;" data-offset-x="15"></div>
</div>