# Browser support

Angular supports most recent browsers.
This includes the following specific versions:

| Browser | Supported versions |
|:---     |:---                |
| Chrome  | 2 most recent versions                      |
| Firefox | latest and extended support release \(ESR\) |
| Edge    | 2 most recent major versions                |
| Safari  | 2 most recent major versions                |
| iOS     | 2 most recent major versions                |
| Android | 2 most recent major versions                |

<div class="alert is-helpful">

Angular's continuous integration process runs unit tests of the framework on all of these browsers for every pull request, using [Sauce Labs](https://saucelabs.com).

</div>

## Polyfills

The [Angular CLI](cli) provides support for polyfills.
When a new project is created, the CLI also creates an `src/polyfills.ts` file.
If your application requires any polyfills, you can add them to the `src/polyfills.ts` file.

If you are not using the CLI to create your projects, see [Polyfills for non-CLI users](#non-cli) section.

If you create a TypeScript file for a custom polyfill, make sure to include it in the `files` property of your `tsconfig` file.

<code-example language="jsonc" syntax="jsonc">

{
  "extends": "./tsconfig.json",
  "compilerOptions": {
    ...
  },
  "files": [
    "src/main.ts",
    "src/polyfills.ts"
  ]
  ...
}

</code-example>


<a id="non-cli"></a>

## Polyfills for non-CLI users

If you are not using the CLI, add your polyfill scripts directly to the host web page \(`index.html`\).

For example:

<code-example header="src/index.html" language="html">

&lt;!-- pre-zone polyfills --&gt;
&lt;script src="node_modules/core-js/client/shim.min.js"&gt;&lt;/script&gt;
&lt;script>
  /**
   &ast; you can configure some zone flags which can disable zone interception for some
   &ast; asynchronous activities to improve startup performance - use these options only
   &ast; if you know what you are doing as it could result in hard to trace down bugs.
   */
  // &lowbar;&lowbar;Zone_disable_requestAnimationFrame = true; // disable patch requestAnimationFrame
  // &lowbar;&lowbar;Zone_disable_on_property = true; // disable patch onProperty such as onclick
  // &lowbar;&lowbar;zone_symbol__UNPATCHED_EVENTS = ['scroll', 'mousemove']; // disable patch specified eventNames
  /*
   &ast; in Edge developer tools, the addEventListener will also be wrapped by zone.js
   &ast; with the following flag, it will bypass `zone.js` patch for Edge.
   */
  // &lowbar;&lowbar;Zone_enable_cross_context_check = true;
&lt;/script&gt;
&lt;!-- zone.js required by Angular --&gt;
&lt;script src="node_modules/zone.js/bundles/zone.umd.js"&gt;&lt;/script&gt;
&lt;!-- application polyfills --&gt;

</code-example>

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@reviewed 2022-11-04