All images on this website are accompanied by a brief alternative text which where appropriate identifies an image or its function. This alternative text (alt-text) is generally only visible when the browser’s automatic image loading feature is turned off.
All text links are written so that they make sense when read out of context.
Most Adobe Acrobat Portable PDF files on this site are tagged to allow basic accessibility.
For more information about PDF accessibility see the Adobe website accessibility section.
The text on this website has been styled using a non-fixed value in a style sheet. This means that users can easily change the text size using their browser settings.
For more information and help about changing your browser settings please visit the BBC’s My Web My Way pages.
If you have any accessibility issue or problem, please contact the Centre for Security Failures Studies.