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## Overview

This page explains the Angular initialization process and how you can manually initialize Angular if necessary.

## Angular `<script>` Tag

This example shows the recommended path for integrating Angular with what we call automatic initialization.

    <!doctype html>
    <html xmlns:ng="http://angularjs.org" ng-app>
      <body>
        ...
        <script src="angular.js">
      </body>
    </html>

- Place the `script` tag at the bottom of the page. Placing script tags at the end of the page improves app load time because the HTML loading is not blocked by loading of the `angular.js` script. You can get the latest bits from http://code.angularjs.org. Please don't link your production code to this URL, as it will expose a security hole on your site. For experimental development linking to our site is fine.
  - Choose: `angular-[version].js` for a human-readable file, suitable for development and debugging.
  - Choose: `angular-[version].min.js` for a compressed and obfuscated file, suitable for use in production.

- Place `ng-app` to the root of your application, typically on the `<html>` tag if you want angular to auto-bootstrap your application.

      <html ng-app>

- If you choose to use the old style directive syntax `ng:` then include xml-namespace in `html` to make IE happy. (This is here for historical reasons, and we no longer recommend use of `ng:`.)

      <html xmlns:ng="http://angularjs.org">

## Automatic Initialization

Angular initializes automatically upon `DOMContentLoaded` event or when the `angular.js` script is evaluated if at that time `document.readyState` is set to `'complete'`. At this point Angular looks for the ``ng-app`` directive which designates your application root. If the ``ng-app`` directive is found then Angular will:

- load the module associated with the directive.
- create the application `injector`
- compile the DOM treating the ``ng-app`` directive as the root of the compilation. This allows you to tell it to treat only a portion of the DOM as an Angular application.

    <!doctype html>
    <html ng-app="optionalModuleName">
      <body>
        I can add: {{ 1+2 }}.
        <script src="angular.js"></script>
      </body>
    </html>

## Manual Initialization

If you need to have more control over the initialization process, you can use a manual bootstrapping method instead. Examples of when you'd need to do this include using script loaders or the need to perform an operation before Angular compiles a page.

Here is an example of manually initializing Angular. The example is equivalent to using the `ng-app` directive.

    <!doctype html>
    <html xmlns:ng="http://angularjs.org">
      <body>
        Hello {{'World'}}!
        <script src="http://code.angularjs.org/angular.js"></script>
        <script>
           angular.element(document).ready(function() {
             angular.bootstrap(document);
           });
        </script>
      </body>
    </html>

This is the sequence that your code should follow:

1. After the page and all of the code is loaded, find the root of the HTML template, which is typically the root of the document.

2. Call `api/angular.bootstrap` to compile the template into an executable, bi-directionally bound application.