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dabblet.css

.content-box {
  columns: 3;
}

dabblet.html

<video autoplay height="124" loop muted width="280" controls><source src="https://frontend3.aandrosov-02-sas.dev.vertis.yandex.net/www-desktop/assets/video_ded637178236710daf2bbf17b40e8cb8.mp4" type="video/mp4">Your browser doesn't support HTML5 video tag.</video>

dabblet.js

// alert('Hello world!');

settings.json

{"view":"split","fontsize":"100","seethrough":"","prefixfree":"1","page":"all"}