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Test Info:

<!DOCTYPE html>
<link rel="author" title="Koji Ishii" href="mailto:kojii@chromium.org">
<link rel="help" href="https://crbug.com/1213358">
<style type="text/css">
.CLASS2 {
writing-mode: vertical-lr;
}
.CLASS4 {
columns: +6.9vh 8589934576;
}
samp, button, div.CLASS1 {
overflow-x: auto;
float: left;
block-size: 2.0%;
}
</style>
<samp class="CLASS2">
<button>
<div class="CLASS1">
<h6 class="CLASS4">ABC</h6>
</div>
ABC
</button>
</samp>