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docs(elements): move clarification about custom elements (#30594) 

Moved clarification that "custom elements" are a subtype of Web Components to the first use of the term "custom elements"

PR Close #30594
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Bryce Kolton 2019-05-21 11:32:24 -07:00 committed by Matias Niemelä
parent 0b23adca80
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aio/content/guide/elements.md
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# Angular Elements Overview
_Angular elements_ are Angular components packaged as _custom elements_, a web standard for defining new HTML elements in a framework-agnostic way.
_Angular elements_ are Angular components packaged as _custom elements_ (also called Web Components), a web standard for defining new HTML elements in a framework-agnostic way.
[Custom elements](https://developer.mozilla.org/en-US/docs/Web/Web_Components/Using_custom_elements) are a Web Platform feature currently supported by Chrome, Firefox, Opera, and Safari, and available in other browsers through polyfills (see [Browser Support](#browser-support)).
A custom element extends HTML by allowing you to define a tag whose content is created and controlled by JavaScript code.
The browser maintains a `CustomElementRegistry` of defined custom elements (also called Web Components), which maps an instantiable JavaScript class to an HTML tag.
The browser maintains a `CustomElementRegistry` of defined custom elements, which maps an instantiable JavaScript class to an HTML tag.
The `@angular/elements` package exports a `createCustomElement()` API that provides a bridge from Angular's component interface and change detection functionality to the built-in DOM API.