Welcome to “Accessibility in OER.” This is not intended to be an exhaustive guide for creating accessible content. The goal is to give a basic understanding of the basic aspects of accessibility related to Open Educational Resources. Our hope is that this inspires you to consider accessibility when choosing Open Educational Resources.
This website and presentation uses a Creative Commons Attribution license. Feel free to share and adapt this freely. In the video description, there is a link to download the original PowerPoint file. The file includes the audio narration and the script. Feel free to use and adapt these materials any way you’d like, but just give credit for our work and don’t use it commercially.
Note: This material is based on Open Washington’s “Module 9: Accessibility.” It was a created under the CC BY 4.0 license that allows for reuse. Open Washington has not endorsed this work.
This same lesson is also available in a video format. See the YouTube video below or download the video.
“The power of the Web is in its universality. Access by everyone regardless of disability is an essential aspect.”
Tim Berners-Lee, W3C Director and Inventor of the World Wide Web
The Web Accessibility Initiative proclaims: Accessibility is a core principle of the Web. The Web has become increasingly essential for many aspects of everyday life. From our recreation, employment, education, or health care, accessibility may even be required by law in many of these situations.
The fundamental truth is that the Web is designed to work for everyone no matter their hardware, software, language, location, or ability. Accessibility means that anybody with disabilities can access the same content and not be excluded from services. According to the World Health Organization (2011, 2022), about 15% of the world’s population has a disability. This number is expected to rise in the future as people live longer.
Not only is Accessibility important for anybody with a disability, it can also improve the quality of your product and service. Accessibility enables people on a variety of different devices and platforms to access products. It assists users with less technical proficiency or situational limitations. When infographics or websites are designed with accessibility in mind, it can curb issues with slow or limited internet connections.
Accessibility for your products gives more users access, removes barriers, and strengthens the presentation, delivery, and design of your existing content. In short, the goal of accessibility is to empower users, no matter the barriers, to access your materials and content in the best way for themselves in their own unique situations.
"Accessibility is all about our ability to engage with, use, participate in, and belong to, the world around us." - Be Lab New Zealand
The first misconception is that accessibility features is only for disabled people. Accessibility is based on universal design principles, which grew out of the Architectural Barriers Act of 1968, and was furthered by the Americans with Disabilities Act of 1990. Good design benefits everyone, not just those with disabilities.
For example, Activision is a popular video game company. In a Twitter thread, David Tisserand, the senior accessibility manager at Activision, indicated that 60% of video game players opted-in for subtitles in an “Assassin’s Creed” game. In a later game, when subtitles were enabled by default, only 5% of players opted-out of subtitles.
Subtitles allow the hard of hearing to experience media, but others also benefit. For example, non-native English speakers can read subtitles and follow along with the video easier than with audio narration alone. In a noisy restaurant, closed captions of media can allow diners to enjoy a sports match.
Accessibility increases the number of ways all people can access content.
It is true that OER is often developed on tight budgets, and it is also true that accessibility can be expensive to add LATE into a project. However, if OER designers consider accessibility from the outset, additional cost is reduced dramatically.
It is impossible to make something accessible for everyone, but each accessibility initiative allows more people to access your content. Many accessibility initiatives cost very little or nothing.
Another way to consider accessibility is the difference between doorknobs and door handles. Door handles are much more accessible than doorknobs because doorknobs require hand dexterity to grab the knob and turn it. Handles do not even require hands to open. A handle can be pushed down with an elbow or foot.
Accessibility benefits more than just those with disabilities. Imagine carrying a heavy box with both hands. When building a facility, knobs and handles cost the same up front, but door handles can let many more people access the building. Consider how much easier an automatic push button -such as those for wheelchair access- would make one’s life.
Our goal is that you will learn how to choose door handles or push buttons for your OER projects.
The goal of Universal Design for Learning (UDL) is to design and create products and environments to be usable by all people, to the greatest extent possible, without adaptation or specialized design. It is a framework that optimizing teaching and learning Center for Applied Special Technology [CAST], 2022). UDL grew out of universal design and the Architectural Barriers Act of 1968.
“Universal Design is the design and composition of an environment so that it can be accessed, understood and used to the greatest extent possible by all people regardless of their age, size, ability or disability.”
National Disability Authority & Centre for Excellence in Universal Design, 2020
For example, a ramp for wheelchair access is not only beneficial to disabled users, but also for people on temporary crutches, someone pulling a heavy suitcase, parents with strollers, or those carrying heavy items.
For the Seven Principles of UDL, Check out National Disability Authority & Centre for Excellence in Universal Design Website.
For a brief overview, check out this video from SUNY Buffalo State.
The goal of UDL is to design curriculum that can be used and understood by everyone and to eliminate barriers in the learning environment to create learning experiences that are accessible to all people regardless of their difference. Disability is just one part of the UDL equation.
CAST (2022) says: “UDL provides a blueprint for creating instructional goals, methods, materials, and assessments that work for everyone–not a single, one-size-fits-all solution but rather flexible approaches that can be customized and adjusted for individual needs.”
UDL takes a ‘proactive’ approach. We design learning experiences that are accessible to ALL learners right from the start, without needing individual accommodation or modification later.
The U.S. Congress in 2008 defined UDL as a “scientific framework” that:
Provides flexibility in the ways information is presented, in the ways students respond or demonstrate knowledge and skills, and in the ways students are engaged
Reduces barriers in instruction
Provides appropriate accommodation, support, and challenges
Maintains high achievement expectations for all students, including students with disabilities and students who are limited English proficient
The Center for Applied Special Technology (CAST) is an organization that is internationally recognized as a leader in the field of UDL. They have developed a framework to improve and optimize teaching and learning for all people based on scientific insights into how humans learn. The framework is based on cognitive neuroscience and identifies three brain networks that are involved in learning:
Affective Networks (Multiple means of Engagement)
Strategic Networks (Multiple Means of Action & Expression)
Recognition Networks (Multiple means of Representation)
The principles and framework of UDL work well with ‘backwards design’ in mind. For more on what backwards design is, visit The Cult of Pedagogy.
The Affective Networks relate to engagement, motivation, and persistence. Learners have different interests, backgrounds, experiences, and personalities. What is engaging to one person may be boring or overwhelming to others.
Designing learning experiences so that they attend to learners’ Affective Networks allows them to use their background knowledge and experiences to make emotional connections to new concepts.
By designing with the Affective Networks in mind, we help our learners answer the following questions:
Why should I care about this?
Why should I learn it?
Why is this important to me?
Affective Networks can be engaged by:
Holding and capturing interest and relevance
Creating self-regulation
Encouraging effort and persistence
The Recognition Networks relate to how learners take in information. There is no “one best way” to presentation information to meet the diverse needs of learners. Some prefer reading or listening, others prefer interaction or listening. Multiple representations of information help all learners learn better.
Recognition Networks create the most traditional connection with prior Accessibility materials. Learners need to access information in the way that works best for them. Learners need options.
Recognition Networks can be engaged by:
Perception options
Language, Math, and Symbol options
Comprehension options
The Strategic Networks relate to how learners demonstrate mastery of what they have learned. Learners can usually express themselves more skillfully in one medium over another. Strategic Networks give them “multiple means of action and expression.”
Learners face many factors and barriers that stop them from expressing what they have learned. This includes traditional tests, daunting papers or projects, or confusion on directions and organization. How can we provide options and recognize barriers for learners to demonstrate the same level of understanding?
Strategic Networks can be engaged by:
Providing Support
Providing Choices
How can my learners show me what they have learned?
How can they demonstrate a mastery of learning?
If you cannot offer choices in how they express what they have learned, provide support. Support options include:
Well-developed and clear Rubrics
Modeling
Examples of expected product
Practice Opportunities
Checklists to completion
Now onto a discussion on what must be taken into consideration during the design process to ensure that materials developed are accessible from inception.
To understand why materials that are designed and created need to be accessible, also check out the sections on Universal Design for Learning (UDL) and Inclusivity.
The how to make things accessible requires a bit of understanding of the systems and tools used to disseminate and consume materials.
DISCLAIMER: Every attempt was made to make this section accessible. Links that are provided to further resources are NOT guaranteed to be accessible!
Operating systems -software- are the ‘brain’ of the computer, whereas hardware is the physical structure. It manages short term and long-term memories and processes. Without an OS, a computer is but a pile of metal. There are three main OS currently used, but Linux will not be included in this short introduction. Check out the following link for more: What is an operating system?
The reason consideration must be made about the OS in the OER design process is that software used for creating materials are often not compatible with competing OS or specific processing software (i.e., a MS Word document will not open in Mac-Pages or in Google Docs the same way). See more under Documents. The three main systems that are currently used in education and workplaces (minus some areas using Linux) are the following:
For more information follow this link MS-Windows.
For more information follow this link Mac-History.
OS is specific for Chrome computers. For more information follow this link Chrome OS.
Web accessibility in the USA is governed by the Americans with Disabilities Act [ADA] (1990) Section 508. The World Wide Web Consortium works on disseminating the standards internationally while most countries also have their own regulations.
Regardless, not all browsers created equal. Each operating system has its own browser (Safari, Chrome, IE) and there are many independent browsers such as Firefox or DuckDuckGo. Materials created on one system, might not operate the same way on another browser. For additional information, review the current accessibility support status of HTML5.
LMS is a system (software set-up) that organizations use to house educational materials that allows for easy dissemination and organization of materials. Here you can find the links to accessibility features to some of the LMS in use in educational institutions.
For more common LMS systems visit eLearning Industry.
Google Classrooms are widely used in K-12 education, and Google Drive with its multiple products are used across professional and educational institutions. Google as a company strives to be accessible and is one of the most accessible products and systems that can be used for document or product sharing. When in doubt, using Google Workspace will likely allow for collaboration then other comparable products on the market.
Think of using a whiteboard for a virtual presentation? Google Jamboard will be more accessible for screen readers then Miro. Want to have collaborative notetaking? Google doc/spreadsheets will often work better then Padlet. Furthermore, Google products are web based, which means any one can access them as long as they have a device with internet capability. to “For more on the accessibility of Google workspace, review the Google Workspace user guide to accessibility.
All designers, educators, and employers should be familiar with at least the idea of assistive technology when it comes to creating OER. Assistive technology can be any piece of equipment -low tech (pencil or book holder) or high tech (software or wheelchairs)- that assist people to maintain or improve functional capabilities of persons with disabilities (ATIA, 2022).
For more information, review the Federal Definition of Assistive Technology.
The next few sections will introduce the most common AT used to access materials on a computer and the internet using a variety of ways.
Screen readers are a software program that ‘read’ the content on a computer screen. It can only be functional if the materials displayed on the screen, such as documents, eBooks, websites, are fully accessible. A free way to explore screen reader is to turn on VoiceOver (iOS) or TalkBack (Android) and operate the technology with no vision, using only the screen reader. NVDA is also a free software for the Windows operating system.
Each operating system has its own built in magnification system, and there is software that offer further magnifications when users require more precision beyond built-in options.
Mac Zoom (built in)
Windows Magnifier (built in)
o or keyboard commands
ZoomText (software)
ZoomText Fusion (JAWS +ZoomText) (software)
Scanned documents that are saved as images (flat pictures) should be made readable, which can be done by clicking a simple setting in Adobe PDF (check accessibility of a document, it will walk you through the steps) or using an OCR software.
Abbyy FineReader 12- Quick Start Guide (for Windows, Mac, Linux)
OmniPage Ultimate - Quick Start Guide (using a scanner and its text editor)
One substantial advantage of OER textbooks over traditional printed textbooks is that OER textbooks are distributed digitally. Digital distribution greatly improves accessibility, but there are a few additional considerations such as quality and access. Instructors and educators should begin with their own institutional resources. Florida State University has its own OER & Affordable Textbook Initiative. If there is a need for other materials OER Commons is an excellent place to begin the search for OER textbooks and learning materials. For more on how to choose good OER Textbooks visit Open Pedagogy [LINK], and see the infographic below.
Videos are an excellent way to deliver audio visual content to audiences. However, not all can access video the same way. Use of YouTube videos can be made accessible two ways. Either searching for videos with closed captioning (Filtering YouTube search results for CC: 'Subtitles/CC') or by making an audio description using YouDescribe.
For more on video accessibility, visit the link to W3C’s Making Audio and Media Accessible.
Video/film accessibility in the public domain is governed by the
CC assumes that the listener cannot hear the video or film. In addition to the dialogue, important sounds (i.e., music or background sounds important to the story) are also given text descriptions. CC is done by a trained person -stenographer- using a court reporter transcription machine or a specialized computer program in real time.
For more information, review how closed captions work.
To enable closed-captions/subtitles on YouTube videos, click the CC logo in the bottom-right corner of the YouTube video. YouTube automatically generates subtitles on many videos, but the quality is often poor. Be sure to check the quality before including any video in your OER.
Universally accepted image of Closed Captioning
A TV screen with two capital CCs. Image by: Public Domain, Open Clipart, SVG ID: 99905
Communication Access Realtime Translation (CART) can be in-person or at a distance using technology to connect to live action to be able to caption to provide accessibility. Think of a hard of hearing person at a live meeting (in-person or on a video conferencing platform) or lecture, accessing what is being shared via speech through reading the captions on a computer screen or a braille device if blind additionally being hard of hearing. When written transcripts are required post-meeting, due to potential mistakes during the live event, editing might be required.
Think captions of a YouTube, Kaltura, ScreenOMatic recordings among others, do not meet accessibility requirements. After the automatic transcription is completed (based on speech recognition) by the system such as Zoom Video conferencing platform, significant editing is necessary by a human for accuracy (World Wide Web Consortium, 2022).
Captions, or ‘subtitles’ or ‘on-screen text’ provide content to hard of hearing and deaf audiences. It is one to two lines of text that appears below (sub) the picture shown and simple transcribes the dialogue on screen. It can be intra- (same) or inter- (between) lingual.
Movies with foreign languages can offer subtitles in the language (interlingual) of the country it is being shown in (World Wide Web Consortium, 2022).
For more information, review how subtitles differ from captions.
Universally accepted image of Subtitles
Speech bubble with horizontal lines on the bottom to imitate writing. Image By: Killarnee, This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International license.
AD is making visual images of television, movies, or other art forms (i.e., museums, nature trails) accessible to those who are blind or visually impaired. It allows those who cannot see a video to hear an audio description of the crucial visual elements of a video. This typically happens during lulls in the dialogue. For example, Netflix and Disney+ includes audio descriptions on a few of their shows. The visually impaired can enjoy a television program, but a busy commuter could just as easily listen to a show while driving.
OER Audio descriptions can be difficult to find, but American Council for the Blind’s “The Audio Description Project” has a comprehensive list of movies, tv shows, and videos with audio descriptions. For more information, review visit The Audio Description Project.
Universally accepted image of Audio Description
Square with AD among vertical lines, inscription: Audio Description. Image by: NPS Graphics, converted by User: ZyMOS, Public domain, via Wikimedia Commons
YouDescribe is a project of The Smith-Kettlewell Eye Research Institute. It was created by Dr. Joshua Miele. YouDescribe allows anyone to add audio description to any YouTube video without any alteration to the original. There are nuances to AD, and one should watch some videos with AD to learn to distinguish what is important and what is inconsequential to be described. There is Wishlist option on the website where one can make a request for AD for a specific video if they do not feel up to trying AD themselves. The only drawback to the Wishlist is that the wait might be substantial.
The world is highly visual. Most of learning and information gathering -nearly 85%- happen accidentally (by chance) through sight (Allman & Lewis, 2014). Therefore, it is no wonder that designers, educators, and companies want to make everything they create visually pleasing. However, visual images can create tremendous accessibility barriers to those with disabilities and those with lack of access (link ‘lack of access’ to Inclusivity) to appropriate technologies.
There are different functions of images, such as decorative, functional, information, complex, or image maps (World Wide Web Consortium, 2022). They can enhance engagement and comprehension. Once the decision was made as to the function of the image, accessibility steps can be taken. Animations (moving images) only when well-designed can add to user experience. When creating materials, less is often more. Keeping materials uncluttered and streamlined helps most everyone out.
Additional resources:
Excellent infographics on making images accessible for people with dyslexia, aphasia, autism spectrum disorder, and others by the UK government
The primary purpose of Alt Text is to allow screen reader users (those with cognitive or sensory disabilities) to obtain a text interpretation of the image displayed. Alt Text contains only crucial elements of the image. Consider the context and what you want people get visually from the image. If there is text, include it except if it were repetitive information.
Alt Text is beneficial for all users when an image cannot be displayed on the page due to technology (mobile device vs. computer, lack of bandwidth of internet). Furthermore, Alt Text helps indexing pages which makes information searchable for search engines more widely.
Again, think: less is more. Be brief and precise, think of what is necessary to convey the message.
Further Resources:
Alt Text Decision tree developed by W3C
Alternative Text Guidance by Image Type (Benetech Diagram Center)
There are captions for videos, meetings, and there are captions for images. Captions and Alt Text are not the same! Alt text is for blind users who use screen readers and can only be accessed if there is a ‘button’ to access it, whereas captions are more like descriptions. Yet, captions do not have to comprehensively mirror what is on the image.
Captions vs. Alt text
Alt text is for blind users who use screen readers where the description is read out loud and is hidden from sighted and low vision users who do not use assistive tech. Captions are displayed on the screen and use more descriptive, supplemental details. Assistive tech will read both Alt Text and Captions. If the caption describes the image, no alt text is needed. Don’t be repetitive; think: would you want to hear the same information read out loud to you?
Example of Alt Text vs. Caption
Alt Text: Students seated at desks paying attention to the teacher.
Caption: A group of people in a classroom. OR Teacher addressing students.
Photo by NeONBRAND on Unsplash; Free to use under the Unsplash License
Using texts allows all users to access materials more easily. Text allows for searches (i.e.: keywords, replace words, or context searches), allows for effective use of assistive technologies, selective or complex enlargement of the text, and can be translate it into foreign languages. Images (i.e.: screenshots, non-OCR-ed PDF) of text make accessing the document difficult for everyone and exclude those who rely on assistive technologies. It also problematizes effective sharing and remixing materials, areas of the 5Rs of OERs. The next section describes the basics of how to make a variety of texts accessible.
Microsoft Office Suite has many elements, but in this section only three will be highlighted.
Word documents can be made accessible with the simple use of headers and using paragraph bulleting and numbering built into the program; all which can be found in the ribbon at the top of the page. Once completed, running the accessibility checker can point out issues that need to be fixed.
Learn how to make your Word documents accessible to people with disabilities.
Excel is a grid system that allows to use text and numbers in an open and unstructured way.
Learn how to make your Excel documents accessible to people with disabilities.
PowerPoint (PPT) accessibility begin with creating a master slide deck where design elements can be added, and delegated into the background, effectively flattening the image. In essence adding design into the back will not require Alt Text for any design elements added to the slides. Slide master lives under View where background, fonts, and design can be changed.
Learn how to make your PowerPoint Presentations accessible to people with disabilities.
Apple’s office suite is called iWork. It mirrors that of the more widely used Microsoft Office Suite or Office 365 in the three main programs for text editing.
Learn how to make your documents accessible using iWork.
Pages
More on features of Pages
Numbers
More on features of Numbers
Keynote
More on features of Keynote
PDFs are a practical and easily distributable way to share documents, even large sizes, such as eBooks. They are highly reliable, as they can be opened on most computing devices and operating systems without losing its formatting, which is especially important when it comes to graphs, diagram, and tables. This reliability allows for better productivity and raise inclusivity by erasing the divide of available devices.
Please make note: scanned pages that are misaligned cannot be tagged or OCR’ed appropriately. However, many PDFs’ can be made accessible even if they are not saved properly, as long as they are not saved as images. Running an accessibility report can help pinpoint the issues and following the suggestion most can be fixed, beginning with appropriate Auto Tagging.
Remediating inaccessible PDF: Part 1
Remediating inaccessible PDF: Part 2
Based on feedback from blind users, the current application that creates the most accessible pdf documents is Adobe Scan.
Adobe Scan: PDF Scanner & OCR (Android, iOS)
iOS Notes
Google Drive- Scan
CamScanner (Android, iOS)
TurboScan (Android, iOS)
There is a tool to quickly convert an inaccessible document to make it accessible: Accessible Media Quick converter, see video below:
Beyond what you can find in the References section, you might find the following collection of resources useful to design accessible materials.
American Council of the Blind. (2022). The audio description project. ACB- The Audio Description Project. https://adp.acb.org/about.html
Collinge, R. (2021, August 17). How to design for color blindness. Momentive- Get Feedback. https://www.getfeedback.com/resources/ux/how-to-design-for-color-blindness/
Foley, E. (2021, January 31). Understanding assistive technology: How does a blind person use the internet? Level Access. https://www.levelaccess.com/understanding-assistive-technology-how-does-a-blind-person-use-the-internet/
National Center on Disability and Access to Education (NCDAE). (2022). GOALS benchmarking and planning tool. Utah State University Center for Persons with Disabilities. https://ncdae.org/goals/planningtool.php
Bartlett, M. B., & Suzanne Ehrlich, S. (2020, December 23). UDL + Design thinking = Designing for all learners. Association for Talent Development (ATD). https://www.td.org/insights/udl-design-thinking-designing-for-all-learners
Center for Applied Special Technology (CAST). (2022, February 10). CAST - Until learning has no limits®. CAST Inc. https://www.cast.org/
Center for Teaching Innovation. (2022). Universal Design for Learning. Cornell University: Computing & Communications Center. https://teaching.cornell.edu/teaching-resources/designing-your-course/universal-design-learning
Posey, A. (2021, April 1). Universal Design for Learning (UDL): A teacher’s guide. Understood. https://www.understood.org/articles/en/understanding-universal-design-for-learning
Universal Design for Learning Implementation and Research Network. (2021, May 17). Home: UDL-IRN. https://udl-irn.org/
Deque Systems. (2022). Web accessibility checklist. Deque University. https://dequeuniversity.com/checklists/web/
Institute for Disability Research, Policy, and Practice. (2022). WebAIM: Web accessibility in mind. Utah State University. https://webaim.org/
Washington State Board for Community and Technical Colleges. (2021). Module 9: Accessibility. Open Washington: Open Educational Resources Network. http://www.openwa.org/module-9/
World Wide Web Consortium (W3C). (2021). W3C Mission. W3C. https://www.w3.org/Consortium/mission.html#principles
A Brief Overview (PowerPoint Slides)
When building OER materials, from the inception of the idea, set out to make them as accessible as possible to most of the population. After a while, it will become just a part of your process and it will not seem like a burden, financially or otherwise. Most importantly, your materials will be available to many more users than they might be otherwise.
Allman, C. B., & Lewis, S. (2014). ECC essentials: Teaching the expanded core curriculum to students with visual impairments (2014–07-31). AFB Press.
American Council of the Blind. (2022). The audio description project. ACB- The Audio Description Project. https://adp.acb.org/about.html
Assistive Technology Industry Association (ATIA). (2022). What is AT? Assistive Technology Industry Association. https://www.atia.org/home/at-resources/what-is-at/
Center for Applied Special Technology (CAST). (2022, February 10). CAST - Until learning has no limits®. CAST Inc. https://www.cast.org/
Collinge, R. (2021, August 17). How to design for color blindness. Momentive- Get Feedback. https://www.getfeedback.com/resources/ux/how-to-design-for-color-blindness/
National Disability Authority & Centre for Excellence in Universal Design. (2022). What is universal design. Centre for Excellence in Universal Design. https://universaldesign.ie/what-is-universal-design/
Open SUNY- MOOC. (2017, October 2). SUNY accessibility: Designing and teaching courses for all learners; week 3: Introduction [Video]. YouTube. https://www.youtube.com/watch?v=YN2dLHcbpSc&feature=youtu.be
Open SUNY- MOOC. (2016, May 3). Recognition networks [Video]. YouTube. https://www.youtube.com/watch?v=ivDN9R525LA
Open SUNY- MOOC. (2016a, May 3). Affective networks [Video]. YouTube. https://www.youtube.com/watch?v=nUX8P-WaxII
Open SUNY- MOOC. (2016b, May 3). Strategic learning networks [Video]. YouTube. https://www.youtube.com/watch?v=MSZvVMx7oro
Tisserand, D. (2019, June 25). Incoming thread about data on subtitles usage in @Ubisoft games [Tweet-thread]. Twitter. https://twitter.com/tisseranddavid/status/1143570437173104643
Universal Design for Learning (UDL) and Accessibility Training. Daytona State College. 2018.
Washington State Board for Community and Technical Colleges. (2021). Module 9: Accessibility. Open Washington: Open Educational Resources Network. http://www.openwa.org/module-9/
World Health Organization. (2021, November 24). Disability and health. WHO. https://www.who.int/news-room/fact-sheets/detail/disability-and-health
World Health Organization. (2011). World report on disability. WHO. https://www.who.int/teams/noncommunicable-diseases/sensory-functions-disability-and-rehabilitation/world-report-on-disability
World Wide Web Consortium. (2022). World Wide Web Consortium (W3C)- Main. W3C. https://www.w3.org