| Name | Description |
|---|---|
| Default theme implementations | Functions and templates that present output to the user, and can be implemented by themes. |
| Menu system | Define the navigation menus, and route page requests to code based on URLs. |
| Name | Location | Description |
|---|---|---|
| check_plain | drupal/includes/bootstrap.inc | Encode special characters in a plain-text string for display as HTML. |
| l | drupal/includes/common.inc | Format an internal Drupal link. |
| t | drupal/includes/bootstrap.inc | Translate strings to the page language or a given language. |