In the chrome extension, how to use the HLS protocol to perform screen recording like loom?

In the browser, if I want to implement a screen recording function similar to loom, and record more than 5 hours of video, how to achieve it if I use HLS, I don’t know any ideas, does anyone know how loom is implemented?

I did a simple analysis of the loom extension, guessing that the implementation of loom is to cut the video into many fragments and upload them, but I don't know how to generate MPD files in the browser. enter image description here This is a screenshot enter image description here

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I have no idea, I don’t know how to use javascript to realize it, I hope I can give a reference link or demo

I am not familiar with media streaming, hope to give guidance