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files/en-us/web/api/web_components/using_shadow_dom/index.md

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 {{DefaultAPISidebar("Web Components")}}
 
-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 modifying its internal implementation. Shadow DOM API enables you to attach a DOM tree to an element, and have the internals of this tree hidden from JavaScript and CSS running in the page.
+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 modifying its internal implementation. Shadow DOM enables you to attach a DOM tree to an element, and have the internals of this tree hidden from JavaScript and CSS running in the page.
 
 This article covers the basics of using the shadow DOM.