Budoux JS

Copy the script.

In the html page, add the script tag, paste the script there

<script>
  [PASTE THE SCRIPT HERE]
</script>

Add class .budou-this to every section that needs Budoux.

<section class="budou-this">
  <h1>Japanese text here</h1>
</section>
<div class="budou-this">
  <button>Japanese text here</button>
</div>
<p class="budou-this">Japanese text here</p>