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<!DOCTYPE html>
<html>
<meta charset="utf-8">
<style>
body>div { margin: 50px 20px; width: 400px; height: 500px; border: 5px solid blue; }
.abc { display: inline-block; border: 2px solid red; inline-size: 30px;
writing-mode: vertical-lr; position: absolute; left: 0; top: 0; }
.test { background: #aaa; position: absolute; left: 0; top: 0; width: 2em; height: 100%; }
.rel { position: relative; }
iframe {
position: absolute; left: 0; top: 34px;
background: yellow; border: 5px solid green;
width: 300px; height: 150px;
}
</style>
<body>
<div class="rel">
<div class="test"><span class="abc">abc</span><iframe src="data:text/html,hello"></iframe></div>
</div>