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<!DOCTYPE html>
<title>Reference: position-area normal alignment overflow in a scrollable container</title>
<style>
.container {
position: relative;
overflow: scroll;
scrollbar-width: none;
width: 100px;
height: 120px;
border: solid;
margin: 1em;
float: left;
}
.anchor {
border: solid blue 10px;
inset: 0;
place-self: center;
position: absolute;
}
.test {
border: solid 5px #0084;
box-sizing: border-box;
position: absolute;
}
.start-inline {
margin-inline: 0 -10px;
}
.start-block {
margin-block: 0 -10px;
}
.end-inline {
margin-inline: -10px 0;
}
.end-block {
margin-block: -10px 0;
}
.center-inline {
margin-inline: -5px;
}
.center-block {
margin-block: -5px;
}
</style>
<div class="container" title="TB LTR">
<div>
<div class="anchor"></div>
<div class="test start-inline start-block" style="inset: 0 60px 70px 0"></div>
<div class="test start-inline start-block" style="inset: 70px 0 0 60px"></div>
<div class="test center-inline center-block" style="inset: 50px 40px 50px 40px"></div>
</div>
</div>
<div class="container" title="TB LTR">
<div class="anchor"></div>
<div class="test start-inline start-block" style="inset: 0 0 70px"></div>
<div class="test start-inline start-block" style="inset: 70px 0 0"></div>
<div class="test center-inline start-block" style="inset: 0 40px"></div>
</div>
<div class="container" style="writing-mode: vertical-rl" title="RL TTB">
<div class="anchor"></div>
<div class="test start-inline start-block" style="inset: 0 60px 70px 0"></div>
<div class="test start-inline start-block" style="inset: 70px 0 0 60px"></div>
<div class="test center-inline center-block" style="inset: 50px 40px 50px 40px"></div>
</div>
<div class="container" style="writing-mode: vertical-rl" title="RL TTB">
<div class="anchor"></div>
<div class="test start-inline start-block" style="inset: 0 0 70px"></div>
<div class="test start-inline start-block" style="inset: 70px 0 0"></div>
<div class="test center-block start-inline" style="inset: 0 40px"></div>
</div>
<div class="container" style="writing-mode: vertical-lr; direction: rtl;" title="LR BTT">
<div class="anchor"></div>
<div class="test start-inline start-block" style="inset: 0 60px 70px 0"></div>
<div class="test start-inline start-block" style="inset: 70px 0 0 60px"></div>
<div class="test center-inline center-block" style="inset: 50px 40px 50px 40px"></div>
</div>
<div class="container" style="writing-mode: vertical-lr; direction: rtl;" title="LR BTT">
<div class="anchor"></div>
<div class="test start-inline start-block" style="inset: 0 0 70px"></div>
<div class="test start-inline start-block" style="inset: 70px 0 0"></div>
<div class="test center-block start-inline" style="inset: 0 40px"></div>
</div>
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