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Polymer is Google's open-source JavaScript library for creating web components. One of those web components is the Google Sign-in web component, which allows you to authenticate a user with their Google account.

Getting started with Polymer

To get started with Polymer, you need to install it using the following command:

npm install -g polymer-cli

Once you have installed Polymer, you can use it to create a new Polymer project using the polymer init command.

polymer init starter-kit

This will create a new Polymer project with a basic project structure.

Adding the Google Sign-in component

To add the Google Sign-in component to your Polymer project, you need to do the following:

1. Install the google-signin component using the following command:

bower install --save google-signin

2. Import the google-signin component in your Polymer element:

<link rel="import" href="../bower_components/google-signin/google-signin.html">

3. Add the <google-signin> element to your HTML template:

<google-signin client-id="YOUR_CLIENT_ID.apps.googleusercontent.com"></google-signin>

4. Handle the google-signedin event to get the user's profile information:

_handleSignIn(e) {
  var profile = e.detail.googleUser.getBasicProfile();
  console.log('Name: ' + profile.getName());
  console.log('Email: ' + profile.getEmail());
}

Conclusion

The Google Sign-in web component is a powerful tool for authenticating users with their Google account. With Polymer, it is easy to add this component to your web application and start using it immediately. Give it a try and see how it can improve the user experience of your application!