Twig templating

Drupal 8's theming layer is complemented by Twig, a component of the Symfony framework. Twig is a template language that uses a syntax similar to Django and Jinja templates. The preceding version of Drupal used PHPTemplate, which required frontend developers to have a rudimentary understanding of PHP.

In this recipe, we will override the Twig template to provide customizations for the email form element. We will use the basic Twig syntax to add a new class and provide a default placeholder.

Getting ready

This recipe assumes that you have already created a custom theme, such as the one you created in the first recipe. When you see mythemein in the following recipe, use the machine name of the theme you created.

Note

At the time of writing this book, the Classy theme does not provide a template suggestion for the email input nor any customization for the input template that differs from Drupal core.

How to do it...

1. Create a templates folder in your theme's base directory to hold your...