Child themes and overrides in Wordpress - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ component_behavior

intermediate

What happens when a child theme overrides a parent theme template file?

In WordPress, if a child theme contains a template file with the same name as one in the parent theme, which template will WordPress use when rendering the page?

A WordPress uses the template file from the parent theme, ignoring the child theme's file.

B WordPress uses the template file from the child theme, overriding the parent theme's file.

C WordPress throws an error because of duplicate template files.

D WordPress merges both template files and uses the combined result.

💡 Hint

Think about how child themes are designed to customize parent themes.

WordPress prioritizes template files in the child theme over the parent theme. This allows child themes to override specific templates without changing the parent theme.

📝 Syntax

intermediate

Which code snippet correctly enqueues a child theme stylesheet in WordPress?

You want to enqueue the child theme's stylesheet properly in WordPress. Which of the following code snippets is correct?

A add_action('wp_enqueue_scripts', function() { wp_enqueue_style('child-style', get_stylesheet_directory_uri() . '/style.css'); });

B add_action('wp_enqueue_scripts', function() { wp_enqueue_style('child-style', get_template_directory_uri() . '/style.css'); });

C add_action('init', function() { wp_enqueue_style('child-style', get_stylesheet_directory_uri() . '/style.css'); });

D add_action('wp_head', function() { wp_enqueue_style('child-style', get_stylesheet_directory_uri() . '/style.css'); });

💡 Hint

Remember the correct hook and function to get the child theme directory URI.

The wp_enqueue_scripts hook is the proper place to enqueue styles and scripts. get_stylesheet_directory_uri() returns the child theme directory URI, which is needed to load the child theme's stylesheet.

🔧 Debug

advanced

Why does the child theme's CSS not apply despite enqueueing the stylesheet?

A developer enqueues the child theme's stylesheet using get_stylesheet_directory_uri() but notices the styles are not applied. What is the most likely cause?

A The child theme's stylesheet path is incorrect because <code>get_template_directory_uri()</code> should be used instead.

B The child theme's stylesheet is enqueued correctly but the parent theme's stylesheet is missing.

C The child theme's stylesheet is enqueued without a version number, causing caching issues.

D The parent theme's stylesheet is enqueued after the child theme's, overriding child styles.

💡 Hint

Think about the order stylesheets load and which styles take precedence.

If the parent theme's stylesheet loads after the child theme's, it can override the child styles. The child stylesheet should be enqueued after the parent stylesheet to ensure its styles apply.

🧠 Conceptual

advanced

What is the purpose of the Template header in a child theme's style.css?

In a WordPress child theme's style.css file, what does the Template header specify?

A It defines the parent theme's directory name that the child theme inherits from.

B It specifies the CSS selector to apply styles to the parent theme.

C It declares the child theme's version number for cache control.

D It sets the template engine used by WordPress to render the theme.

💡 Hint

Think about how WordPress knows which theme is the parent.

The Template header in the child theme's style.css tells WordPress the folder name of the parent theme. This links the child theme to its parent.

❓ state_output

expert

What is the output of this child theme functions.php code?

Consider this functions.php code in a child theme. What will be the output when the site loads?

add_action('wp_enqueue_scripts', function() {
  wp_enqueue_style('parent-style', get_template_directory_uri() . '/style.css');
  wp_enqueue_style('child-style', get_stylesheet_directory_uri() . '/style.css', ['parent-style']);
});

add_action('wp_head', function() {
  echo '<!-- Child theme loaded -->';
});

Wordpress

add_action('wp_enqueue_scripts', function() {
  wp_enqueue_style('parent-style', get_template_directory_uri() . '/style.css');
  wp_enqueue_style('child-style', get_stylesheet_directory_uri() . '/style.css', ['parent-style']);
});

add_action('wp_head', function() {
  echo '<!-- Child theme loaded -->';
});

A The child stylesheet loads before the parent, causing style conflicts, and the comment appears twice.

B Only the parent stylesheet loads, and the HTML comment does not appear.

C The parent and child stylesheets load in correct order, and the HTML comment <!-- Child theme loaded --> appears in the page head.

D A fatal error occurs because of missing function parameters.

💡 Hint

Check the order of enqueued styles and where the comment is echoed.

The code enqueues the parent stylesheet first, then the child stylesheet with the parent as a dependency, ensuring correct load order. The comment is echoed in the head section, so it appears in the page source.