Twitch embed not working

API
4

A parent should also be just the domain

So

<iframe src="https://player.twitch.tv/?video=1165453909&parent=https://localhost" frameborder="0"
     allowfullscreen="true" scrolling="no" height="378" width="620"></iframe>

should be

<iframe src="https://player.twitch.tv/?video=1165453909&parent=localhost" frameborder="0"
     allowfullscreen="true" scrolling="no" height="378" width="620"></iframe>