Web components and shadow DOM

This week I got asked by my boss to build a pretty simple chrome extension that detects the presentation of a toast in a call center app we use and plays a sound through the external speakers when it appears. Sounds easy right?! Forgive me if I say something stupid here - I've not touched Web Components yet so the concepts are totally alien to me. The application has a load of nested web components, each with their own shadow DOM. That made something straightforward feel very convoluted. I had t