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Using shadow DOM - Web APIs | MDN
https://developer.mozilla.org/en-us/docs/web/web_components/using_shadow_dom
“An important aspect of custom elements is encapsulation, because a custom element, by definition, is a piece of reusable functionality: it might be dropped into any web page and be expected to work. So it's important that code running in the page should not be able to accidentally break a custom element by...” (the page’s own description)
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