Drupal Drupal Theming & Frontend Development 1

Question 1

What file is required in every Drupal theme to declare its name, regions, and base theme?

Accepted Answer

theme_name.info.yml

Answer

Every Drupal theme must have a .info.yml file declaring its name, type: theme, core_version_requirement, regions, and optional base theme.

Question 2

How do you attach a CSS or JS library to a specific Twig template in Drupal?

Accepted Answer

Add {{ attach_library('mytheme/library-name') }} in the Twig file

Answer

The attach_library() Twig function loads a named library (defined in libraries.yml) only on pages where that template renders, avoiding global CSS/JS bloat.

Question 3

In Drupal theming, what is the purpose of a 'preprocess function' in a .theme file?

Accepted Answer

Add or modify variables available inside a Twig template

Answer

Preprocess functions (e.g., THEME_preprocess_node()) allow theme PHP code to add, modify, or compute variables that are then passed into corresponding Twig templates.

Question 4

What is a 'theme suggestion' in Drupal and how does it enable template overrides?

Accepted Answer

A prioritized list of template filenames Drupal tries before falling back to defaults

Answer

Theme suggestions give Drupal an ordered list of template filenames to try (e.g., node--article.html.twig before node.html.twig), enabling granular per-bundle overrides.

Question 5

Which Drupal core theme is commonly used as a base theme for building administration-style custom themes?

Accepted Answer

Stable9

Answer

Stable9 (previously Stable) provides empty template files and no CSS, making it the cleanest base theme for fully custom themes that need no inherited styles.

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Drupal Drupal Theming & Frontend Development 1