Docs: updating README with a Polyfills anchor

im-open · Apr 8, 2020 · 199559f · 199559f
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diff --git a/README.md b/README.md
@@ -59,6 +59,7 @@ customElements.define('incrementer', ReactTestComponent);
 
 The key pieces of code are `... extends ReactHTMLElement` and `this.mountPoint`.
 
+> ### Polyfills
 > One thing to remember is that you will need to load [the webcomponentsjs polyfills](https://www.webcomponents.org/polyfills) for `ReactHTMLElement` to work in all browsers. Be sure to include [the ES5 adapter](https://github.com/webcomponents/polyfills/tree/master/packages/webcomponentsjs#custom-elements-es5-adapterjs), as we currently transpile `ReactHTMLElement` down to ES5. The polyfills should be in the `<head>`, and should look something like this:
 >
 > ```html