theme_links() 有一个新的可访问属性$heading

Issue: #364219: Navigation menus should be preceded by headings of the appropriate level (usually <h2>).

To meet Web Content Accessibility Guidelines (WCAG) requirements, HTML headings should be used before all content sections, which includes lists of links such as menus. The headers ensure that there is a quick way for assistive technology users to browse through the content; however, most visual users do not need headers on navigation lists, because they can get a sense of the structure by how they are arranged visually on the page. So, the recommendation is to add a header with the "element-invisible" CSS class on it, so that only assistive technology users will notice the header.

It is also important that the header level used (H2, H3, etc.) be appropriately nested in the heading hierarchy. So, it is not recommended to just blindly add an H2 header before each list.

For that reason, the theme_links() function, which is normally called via theme('links', ...), has a new third parameter $heading to add the required heading to a list of links.

For example - Drupal 6 in a typical page.tpl.php file:

Drupal 7:

This will result in a semantically correct and accessible secondary menu in Drupal 7, because an invisible heading has been added:

For more information:

• Accessibility in Drupal
• Theming accessibility guide
• Headings section of theme accessibility guide