Accessibility Statement

It is a priority for Credo that our system is accessible to all types of users, and we have designed Credo Online Reference Service to be used by people with disabilities.

Credo is committed to compliance with disability aids, such as screen readers. Specific elements have been put in place to aid visually-impaired users:

  • Credo Online Reference Service has hyperlinks specifically placed to enable users with screen readers to skip common navigation elements of our pages and jump to a page's main content (visible only to Screenreader tools)
  • We've created a narrative sitemap that describes pages within Credo Online Reference Service to users who cannot see them
  • The Credo Online Reference Service platform provides text equivalents for images, charts and graphs.

Keyboard Navigation

Credo Online Reference Service has been designed to be used with either keyboard or mouse controls. Here's how to operate the various features of Credo Online Reference Service using only the keyboard.

Tab and Shift-Tab Keys

The tab (and shift-tab) keys allow you to move to each link or form element. As you press tab, the focus will move forward through the links. Shift-tab will move backwards. The last tab stop will cycle back to the first tab stop as you keep pressing tab. In a screenreader, the first link on any page will be a "Skip to Content" page. 

Information overlays (such as book and entry summaries) that are normally shown when hovering the mouse over a book or entry link are also shown when the link receives focus via the tab key. When a link has focus, press enter to follow the link. Some links in Credo Online Reference Service are actions that are performed within the page being shown, for example links that expand or contract a hierarchical display of other links.

Form Elements

When focus is on a checkbox, press spacebar to toggle the check.

When focus is on a selection list, such as the subject selections offered on the search form, use the up or down arrow keys to change the selection.

When focus is on a radio button group, the left or right arrow keys will move the selected button.

Concept Map

The Concept Map is a graphical presentation of entries related to a search term. The map contains a set of linked nodes. The nodes contain an entry heading. Each node is connected to other nodes that are related to that node. Java must be enabled to use the Concept Map. After doing a Concept Map search, the page will show a graphical user interface for manipulating the map. The Concept Map can be operated with the following key commands.

Use Tab to navigate through the different windows and controls. There are three controls. One for zooming the display, one for rotating the display and a third for adjusting the link levels. There are two other windows, the main window with the concept map and another window with a list of visited nodes.

Zoom Control

Press up arrow to zoom in.
Press down arrow to zoom out.
Rotation Control

Press up arrow to rotate clockwise.
Press down arrow to rotate counter clockwise.
Link Levels Control

Press up arrow to increase levels.
Press down arrow to decrease levels.
Visited Nodes List Window

Press up arrow to move up one item.
Press down arrow to move down one item.
Press Enter to select the item. This will redraw the map with this item as the center node.
Main Concept Map Window

Press the up, down, left or right arrow to pan the map.
Press n to move to the next node in breadth first search order. If no node is yet selected, start at the center node.
Press p to move to the previous node in breadth first search order. If no node is yet selected start at the final node.
Press Enter to select a node. This will redraw the concept map with the selected entry as the center node.
Press Shift to open an entry summary pop-up window for the current node.
Entry Summary Pop-up

Press Enter to open entry. This opens the entry display in a new window.
Press Shift to close the pop-up.


"Listen" Feature

Each Credo entry and Topic Page has a built-in screenreader option available. To reach it with keyboard commands, tab to the "Listen" menu button and hit enter. To listen to a specific section of an  entry, highlight the section with your mouse and click listen (not compatible with keyboard commands). 



The Credo Online Reference Service web site adheres to Section 508 of the Rehabilitation Act.

Voluntary Product Accessibility Template

In 2014, we completed an internal accessibility evaluation of the Credo Online Reference Service platform using the HTML CodeSniffer tool and several screenreader tools, and created Credo’s VPAT. Click here for Credo’s Voluntary Product Accessibility Template (VPAT) (PDF link). Please note that this applies only to the Credo Online Reference Service Platform; Literati platforms are pending an evaluation.