8;&#x30EC;&#x30E1;&#x30F3;&#x30C4;&#x3092;&#x7D39;&#x4ECB;&#x3059;&#x308B;&#x6700;&#x9AD8;&#x306E;&#x8CC7;&#x6599;&#x3067;&#x3059;&#xFF01;</p>
<p><div style="position: relative;padding-bottom: 56.25%;padding-top: 25px;height: 0;"><iframe frameborder="0" allowfullscreen style="border: none;position: absolute;top: 0;left: 0;width: 100%;height: 100%;" src="//www.youtube.com/embed/tyFe9Pw6TVE"></iframe></div></p>
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Docs on custom elements can be kind of confusing, but I hope this is enough for people to get 