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The Protocols and Formats Working Group is no longer chartered to operate. Its work will continue in two new Working Groups:

  • https://www.w3.org/WAI/APA/ Accessible Platform Architectures, to review specifications, develop technical support materials, collaborate with other Working Groups on technology accessibility, and coordinate harmonized accessibility strategies within W3C; and
  • https://www.w3.org/WAI/ARIA/ Accessible Rich Internet Applications, to continue development of the Accessible Rich Internet Applications (WAI-ARIA) suite of technologies and other technical specifications when needed to bridge known gaps.

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This Wiki page was edited by participants of the Protocols and Formats Working Group. It does not necessarily represent consensus and it may have incorrect information or information that is not supported by other Working Group participants, WAI, or W3C. It may also have some very useful information.


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CAPTCHA Note Update


The Current Document

Revisions Needed to Current CAPTCHA Note

New Information & Research

Research: Surveys

Usage Guides

CAPTCHA "Busting" Tools

Note: Services are listed alphabetically. Inclusion or exclusion from this list does not imply anything other than the compiler's ignorance.

CAPTCHA alternatives

CAPTCHA Email Threads (post CAPTCHA Note Release)

CAPTCHA Threads on Protocols & Formats Working Group List (w3c-wai-pf)

NOTE: The w3c-wai-pf@w3.org emailing list's archives are member-confidential.

PF Thread 1: CAPTCHA combinatorics

CAPTCHA Implementors' Threads on WAI-XTech

NOTE: The wai-xtech@w3.org emailing list's archives are public.

WAI-XTech Thread 1: "reCAPTCHA" and "captcha workarounds"

WAI-XTech Thread 2: Progress Report on CAPTCHA (July 2007)

WAI-XTech Thread 3: reCAPTCHA Imnplementation Problems (July 2007)

WAI-XTech Thread 4: reCAPTCHA: audio alternativess and audio formats (July 2007)

WAI-XTech Thread 5: note: two-level nav in WAI-ARIA (was CAPTCHA Implementation Problems)


WAI-XTech Thread 7: wikimedia CAPTCHA issue report and responses (August 2007)

WAI-XTech Thread 8: Getting Past Google's CAPTCHA (September 2008)

Targetted Discussion Threads on WAI-XTECH (wai-xtech@w3.org)

WAI-XTech Thread 2.1: Authentification (March 2010)

CAPTCHA Threads on HTML Accessibility Task Force List (public-html-a11y)

HTML TF Thread 1: keep CAPTCHA out of HTML5 (March 2010)

HTML TF Thread 2: CAPTCHA alternatives/pitfalls

HTML TF Thread 3: Authentification (was: CAPTCHA alternatives/pitfalls) March 2020

NOTE: This thread has been moved to wai-xtech@w3.org

HTML TF Thread 4: Draft CAPTCHA Survey