The RAAB website conforms to following AA standards, unless indicated otherwise, according to W3C web accessibility guidelines (W3C accessibility checklist).

Accessibility standards

Provide text alternatives for non-text content (e.g. images)

1.1 Provide text alternatives for non-text content (e.g. images) (A)

Provide alternatives for time-based media (audio and video)

1.2.1 - Provide alternatives for pre-recorded audio-only or video-only content (A)

1.2.2 - Provide captions for pre-recorded audio (A)

1.2.3 - Provide alternatives for pre-recorded synchronized audio/video (A)

1.2.4 - Provide captions for live audio in synchronized audio/video (AA)

1.2.5 - Provide an audio description of pre-recorded video (AA)

Content can be presented in different ways (e.g. through a screen reader) without losing info or structure

1.3.1 - Information, structure, and relationships can be programmatically determined (A)

1.3.2 - The correct reading sequence can be programmatically determined (A)

1.3.3 - Do not rely solely on sensory characteristics of components such as shape, size, visual location, orientation, or sound (A)

1.3.4 - Do not restrict a page’s view to a single display orientation, such as portrait or landscape, unless a specific orientation is essential. (AA)

1.3.4 - For text input elements, the autocomplete attribute should be in place to let the user know what kind of data is expected to be entered. (AA) [not currently met]

Make sure content is readable and the foreground contrasts sufficiently with the background

1.4.1 - Colour is not used as the only visual means of conveying info (A)

1.4.2 - Audio can be paused and stopped, or the audio volume can be changed (A)

1.4.3 - Text has enough contrast with the background (contrast ratio 4:5:1 for small text and 3:1 for large text) (AA)

1.4.4 - Text can be enlarged up to 200% without the use of assistive technology (screen magnifiers) (AA)

1.4.5 - Text is used rather than images of text, except where the presentation of text is essential, such as in logos (AA)

1.4.10 - When content is zoomed in to a large degree, the site will adapt to ensure that scrolling only occurs in one direction. (AA)

1.4.11 - Visual objects must have a contrast ratio of 3:1 against adjacent colour(s). (AA)

1.4.12 - Text-based CSS settings can be changed to certain minimum values without loss of content or functionality. (AA)

1.4.13 - Content that appears on mouse hover or keyboard focus must be dismissable, hoverable, and persistent. (AA)

Make all functionality available from a keyboard

2.1.1 - All functionality is available from a keyboard, except for tasks such as drawing (A)

2.1.2 - The user can use the keyboard to move through page elements and is not trapped on a particular element. (A)

Give users enough time to read and use content

2.2.1 - Users are warned of time limits shorter than 20 hours and time limits can be turned off or extended (A)

2.2.2 - Users can stop, pause or hide moving, blinking, scrolling or auto-updating information (A)

Do not use content that can cause seizures

2.3.1 - No more than three flashes in a 1- second period, or the flashes are below the defined thresholds (A)

Help users to navigate, find content, and determine where they are

2.4.1 - Users can bypass blocks of content that are repeated on multiple Web pages, such as navigation menus (A)

2.4.2 - The page has a title describing its topic or purpose (A)

2.4.3 - Users can tab through the elements of a page in a logical order (A)

2.4.4 - The purpose of each link can be determined from the link text or context (A)

2.4.5 - More than one way is available to navigate to other Web pages, such as a sitemap (AA)

2.4.5 - The headings and labels are clear and consistent, accurately describing the topic or purpose (AA)

2.4.6 - The page element with the current keyboard focus has a visible focus indicator (AA)

Make it easier for users to operate functionality through various inputs beyond keyboard

2.5.1 - All operations must use simple gestures that need only a single touch or click. If more complex operations exist, a single touch or click alternative must be given. (A)

Text should be readable and understandable

3.1.1 - Specify the language (e.g. English) of the Web page (A)

3.1.2 - Specify the language (e.g. English) of each text phrase or passage that is in a language other than the default language specified for the entire Web page (AA)

Make Web pages appear and operate in predictable ways

3.2.1 - When a UI component receives focus, this does not trigger unexpected actions such as automatically submitting a form, opening a new window or switching focus to another element (A)

3.2.2 - Changing the setting of a checkbox, radio button or other UI component does not trigger unexpected changes in context, such as causing significant changes to the page content or opening a new window (A)

3.2.3 - Navigation menus are in the same location and order on every Web page (AA)

3.2.4 - UI components used across the Web site are identified consistently on every page (AA)

Help users to avoid and correct mistakes

3.2.1 - Input errors are clearly marked and described to the user (A)

3.2.2 - Items requiring user input are clearly labeled or have clear instructions (A)

3.2.3 - When the user makes an input error, give suggestions for valid input (AA)

Browser compatibility and accessibility options

Please visit the London School of Hygiene & Tropical Medicine accessibility statement page for information on improving accessibility in the Chrome, Safari, Firefox and Edge web browsers.

Reporting accessibility problems with this website

We are always looking to improve the accessibility of this website. If you find any problems not listed on this page or think we are not meeting accessibility requirements, please contact us at

What we are doing to improve accessibility

In the future we will be working to roll out improvements to accessibility in the following areas:

  • assistive technologies, such as screen readers, and keyboard functionality
  • search pages will be updated with autocomplete functionality
  • allow captions and audio descriptions for any Audio and Video nuggets