Global Advisory Committee on Vaccine Safety

Accessibility (Practical criteria)

Accessibility (Practical criteria)

  • Website should be consistently available and not frequently inaccessible due to server unreliability, high demand, or other problems.
  • Website should be accessible by the lowest-level available browser commonly used. The site should provide information about the platform(s) and browser(s) that permit viewing.
  • The site should not have large and unnecessary graphics.
  • Simple HTML (text) alternatives should be available for essential information, as not everyone has the desire or capability to download and use all software and plug-ins needed to view audio, video, or PDF files.
  • If content is available as a PDF (camera-ready) document, the site should include information on how to download the file and instructions (and a link) for obtaining the necessary software to do so.
  • Users should be warned (and file size indicated) before attempting to download large files, and alternatives should be provided.
  • If frames must be used, a "No Frames" alternative should be offered.
  • User support service contact information should be available for technical questions.
  • Site should have a good internal search engine with clear instructions for its use.
  • Sites should not prevent visitors from returning to a previous site or redirect the user to a site the viewer did not intend to visit.
  • Intrasite and external links should be monitored and maintained to minimize broken links. Visitors should be able to easily escape side searches and find his/her way backward and forward through links. Users should be alerted when leaving the original site.
  • It is helpful, but not essential, that a site be accessible from common Internet search engines.

Personal

  • Who can access site? (e.g., is all content free or are there restrictions on access, is registration necessary, etc.) If there a charge to access the website, how does this fee compare to other available materials?
  • Are materials on the site copyrighted or in the public domain? Information on the legality of further use or distribution of materials should be clearly posted.
  • What language is the website written in? Are other languages available?
  • Language should be clear, easy to read, and appropriate for intended users.
  • Text font, size, and colour should be readable. Website design should keep in mind the special accessibility issues of many potential users, such as the visually impaired. Web Content Accessibility Guidelines from the Web Accessibility Initiative include suggestions for backgrounds, text, colours, links, navigation, and more.
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