message: docs: update elements page
  This section was outdated since now all CLI projects are es2015+ and don't require the polyfill since legacy browsers are no longer supported.
  PR Close
diff: @@ -123,21 +123,14 @@ The recently-developed [custom elements](https://developer.mozilla.org/en-US/doc
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  -In browsers that support Custom Elements natively, the specification requires developers use ES2015 classes to define Custom Elements - developers can opt-in to this by setting the `target: "es2015"` property in their project's [TypeScript configuration file](/guide/typescript-configuration). As Custom Element and ES2015 support might not be available in all browsers, developers can instead choose to use a polyfill to support older browsers and ES5 code.
  -
  -Use the [Angular CLI](cli) to automatically set up your project with the correct polyfill:
  +Use the [Angular CLI](cli) to add the `@angular/elements` package to your workspace.
  <code-example language="sh">
  -ng add @angular/elements --project=*your_project_name*
  +npm install @angular/elements --save
  </code-example>
  -- For more information about polyfills, see [polyfill documentation](https://www.webcomponents.org/polyfills).
  -
  -- For more information about Angular browser support, see [Browser Support](guide/browser-support).
  -
  -
  ## Example: A Popup Service
  Previously, when you wanted to add a component to an application at runtime, you had to define a _dynamic component_, and then you would have to load it, attach it to an element in the DOM, and wire up all of the dependencies, change detection, and event handling, as described in [Dynamic Component Loader](guide/dynamic-component-loader).
  