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<!DOCTYPE html>
<meta charset="utf-8">
.v-lr { writing-mode:vertical-lr; }
.v-rl { writing-mode:vertical-rl; }
div {
width: 300px;
height: 200px;
background: #ddd;
margin: 50px;
text-rendering: optimizeLegibility;
<div class="v-rl">
First part of the block.
<i id="test">New text inserted by script, to cause a reflow that slides the following lines.</i>
We will insert enough new content that it wraps onto additional lines.
Here is some more text that follows a forced break.
Observe what happens to it when text is added earlier.