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Discussion on: Why I don't use web components

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Andrea Giammarchi

Shadow DOM is controversial because it plays bad with SSR, and its polyfill is not really specs compliant.

To style Custom Elements you also don't need anything different than you do already, and surely you don't need Shadow DOM at all to have Custom Elements.

Maybe Shadow DOM was sold as the true Web Components must do magic, but since 2014 I've never used it, and never needed it.

We ship Custom Elements to dozen million users, and we never used once attachShadow.

TL;DR the debate about Shadow DOM is pretty simple: don't use Shadow DOM if you target legacy browsers without native Custom Elements V1 support, or use very constrained and simple variants of the spec, like the attachshadow library that works down to IE9.