docs(elements): add "Firefox" for support of custom elements (#27789)

Firefox now supports custom elements: https://caniuse.com/#feat=custom-elementsv1

PR Close #27789
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Nico Jansen 2018-12-21 10:29:52 +01:00 committed by Ben Lesh
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_Angular elements_ are Angular components packaged as _custom elements_, 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, Opera, and Safari, and available in other browsers through polyfills (see [Browser Support](#browser-support)).
[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.