<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-color-4/#propdef-opacity">
<link rel="help" href="https://crbug.com/1237054">
<link rel="author" title="mailto:kojii@chromium.org">
<link rel="match" href="reference/overflow-inline-block-with-opacity-ref.html">
<style>
  span { opacity: 0.99; }
  #button { display: inline-block; inline-size: 0px; }
</style>
<span>
  <div id="button">hello world</div>
</span>