上海时时乐今开奖号码:Techniques for WCAG 2.1

Updated 7 June 2019


Abstract

This Techniques for WCAG 2.1 document provides guidance for web content authors and evaluators on meeting Web Content Accessibility Guidelines (WCAG) 2.1 success criteria. It is part of a series of documents published by the W3C Web Accessibility Initiative (WAI) to support WCAG 2.1. For an introduction to WCAG, supporting technical documents, and educational material, see Web Content Accessibility Guidelines (WCAG) Overview.

Techniques are informative—that means they are not required. The basis for determining conformance to WCAG 2.1 is the success criteria from the WCAG 2.1 standard—not the techniques. For important information about techniques, please see the Understanding Techniques for WCAG Success Criteria section of Understanding WCAG 2.1.

Techniques for WCAG 2.1 is not intended to be used as a stand-alone document. Instead, it is expected that content authors will usually use How to Meet WCAG 2.0: A customizable quick reference to read the WCAG success criteria, and follow links from there to specific topics in Understanding WCAG 2.0 and to specific techniques.

Status of This Document

This is the official version of "Understanding WCAG 2.1", and is referenced by Web Content Accessibility Guidelines 2.1. This resource is maintained as needed to update interpretive guidance and reference techniques to meet the guidelines.

To comment, file an issue in the W3C WCAG 2.1 GitHub repository. Although the proposed Success Criteria in this document reference issues tracking discussion, the Working Group requests that public comments be filed as new issues, one issue per discrete comment. It is free to create a GitHub account to file issues. If filing issues in GitHub is not feasible, send email to [email protected] (comment archive).

Introduction to Techniques for WCAG 2.1

This Techniques for WCAG 2.1 document provides guidance for web content authors and evaluators on meeting Web Content Accessibility Guidelines (WCAG) 2.1success criteria. It is part of a series of documents published by the W3C Web Accessibility Initiative (WAI) to support WCAG 2.1. For an introduction to WCAG, supporting technical documents, and educational material, see Web Content Accessibility Guidelines (WCAG) Overview.

WCAG 2.1 itself is a stable document that does not change. This Techniques for WCAG 2.1 document is updated periodically to cover more current best practices and changes in technologies and tools.

Techniques are informative—that means they are not required. The basis for determining conformance to WCAG 2.1 is the success criteria from the WCAG 2.1 standard—not the techniques.

Note

W3C cautions against requiring W3C's sufficient techniques. The only thing that should be required is meeting the WCAG 2.1 success criteria. To learn more, see:

Techniques for WCAG 2.1 is not intended to be used as a stand-alone document. Instead, it is expected that content authors will usually use How to Meet WCAG 2.1: A customizable quick reference to read the WCAG success criteria, and follow links from there to specific topics in Understanding WCAG 2.1 and to specific techniques.

Publication of techniques for a specific technology does not imply that the technology can be used in all situations to create content that meets WCAG 2.1 success criteria and conformance requirements. Developers need to be aware of the limitations of specific technologies and provide content in a way that is accessible to people with disabilities.

For important information about techniques, please see the Understanding Techniques for WCAG Success Criteria section of Understanding WCAG 2.1.

Change Log

A list of new, removed or significantly updated techniques:

  1. : Added C34 Using media queries to un-fixing sticky headers / footers
  2. : Added C36 Allowing for text spacing override
  3. : Added C37 Using CSS max-width and height to fit images
  4. : Added G207 Ensuring that drag-and-drop actions can be cancelled
  5. : Added F95 Failure of Success Criterion 1.4.13 due to content shown on hover not being hoverable
  6. : Added F96 Failure of Success Criterion 2.5.3 due to "accessible name" not containing the visible label text
  7. : Added C38 Using CSS width, max-width and flexbox to fit labels and inputs
  8. : Added G207 Ensuring that a contrast ratio of 3:1 is provided for icons

For a more detailed view of recent changes to the informative documents see the 上海时时乐上.

Acknowledgments

Additional information about participation in the Accessibility Guidelines Working Group (AG WG) can be found on the Working Group home page.

Participants of the AG WG active in the development of this document:

Other previously active WCAG WG participants and other contributors to WCAG 2.0, WCAG 2.1, or supporting resources

Paul Adam, Jenae Andershonis, Wilhelm Joys Andersen, Andrew Arch, Avi Arditti, Aries Arditi, Mark Barratt, Mike Barta, Sandy Bartell, Kynn Bartlett, Chris Beer, Charles Belov, Marco Bertoni, Harvey Bingham, Chris Blouch, Paul Bohman, Frederick Boland, Denis Boudreau, Patrice Bourlon, Andy Brown, Dick Brown, Doyle Burnett, Raven Calais, Ben Caldwell, Tomas Caspers, Roberto Castaldo, Sofia Celic-Li, Sambhavi Chandrashekar, Mike Cherim, Jonathan Chetwynd, Wendy Chisholm, Alan Chuter, David M Clark, Joe Clark, Darcy Clarke, James Coltham, Earl Cousins, James Craig, Tom Croucher, Pierce Crowell, Nir Dagan, Daniel Dardailler, Geoff Deering, Sébastien Delorme, Pete DeVasto, Iyad Abu Doush, Sylvie Duchateau, Cherie Eckholm, Roberto Ellero, Don Evans, Gavin Evans, Neal Ewers, Steve Faulkner, Bengt Farre, Lainey Feingold, Wilco Fiers, Michel Fitos, Alan J. Flavell, Nikolaos Floratos, Kentarou Fukuda, Miguel Garcia, P.J. Gardner, Alistair Garrison, Greg Gay, Becky Gibson, Al Gilman, Kerstin Goldsmith, Michael Grade, Karl Groves, Loretta Guarino Reid, Jon Gunderson, Emmanuelle Gutiérrez y Restrepo, Brian Hardy, Eric Hansen, Benjamin Hawkes-Lewis, Sean Hayes, Shawn Henry, Hans Hillen, Donovan Hipke, Bjoern Hoehrmann, Allen Hoffman, Chris Hofstader, Yvette Hoitink, Martijn Houtepen, Carlos Iglesias, Richard Ishida, Jonas Jacek, Ian Jacobs, Phill Jenkins, Barry Johnson, Duff Johnson, Jyotsna Kaki, Shilpi Kapoor, Leonard R. Kasday, Kazuhito Kidachi, Ken Kipness, Johannes Koch, Marja-Riitta Koivunen, Preety Kumar, Kristjan Kure, Andrew LaHart, Gez Lemon, Chuck Letourneau, Aurélien Levy, Harry Loots, Scott Luebking, Tim Lacy, Jim Ley, Alex Li, William Loughborough, N Maffeo, Mark Magennis, Kapsi Maria, Luca Mascaro, Matt May, Sheena McCullagh, Liam McGee, Jens Oliver Meiert, Niqui Merret, Jonathan Metz, Alessandro Miele, Steven Miller, Mathew J Mirabella, Matt May, Marti McCuller, Sorcha Moore, Charles F. Munat, Robert Neff, Charles Nevile, Liddy Nevile, Dylan Nicholson, Bruno von Niman, Tim Noonan, Sebastiano Nutarelli, Graham Oliver, Sean B. Palmer, Devarshi Pant, Nigel Peck, Anne Pemberton, David Poehlman, Ian Pouncey, Charles Pritchard, Kerstin Probiesch, W Reagan, Adam Victor Reed, Chris Reeve, Chris Ridpath, Lee Roberts, Mark Rogers, Raph de Rooij, Gregory J. Rosmaita, Matthew Ross, Sharron Rush, Joel Sanda, Janina Sajka, Roberto Scano, Gordon Schantz, Tim van Schie, Wolf Schmidt, Stefan Schnabel, Cynthia Shelly, Glenda Sims, John Slatin, Becky Smith, Jared Smith, Andi Snow-Weaver, Neil Soiffer, Mike Squillace, Michael Stenitzer, Diane Stottlemyer, Christophe Strobbe, Sarah J Swierenga, Jim Thatcher, Terry Thompson, Justin Thorp, David Todd, Mary Utt, Jean Vanderdonckt, Carlos A Velasco, Eric Velleman, Gijs Veyfeyken, Dena Wainwright, Paul Walsch, Daman Wandke, Richard Warren, Elle Waters, Takayuki Watanabe, Gian Wild, David Wooley, Wu Wei, Kenny Zhang, Leona Zumbo.

Enabling funders

This publication has been funded in part with U.S. Federal funds from the Health and Human Services, National Institute on Disability, Independent Living, and Rehabilitation Research (NIDILRR), initially under contract number ED-OSE-10-C-0067 and now under contract number HHSP23301500054C. The content of this publication does not necessarily reflect the views or policies of the U.S. Department of Health and Human Services or the U.S. Department of Education, nor does mention of trade names, commercial products, or organizations imply endorsement by the U.S. Government.

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