The Department of Justice’s revised regulations for Titles II and III of the Americans with Disabilities Act of 1990 (ADA) were published in the Federal Register on September 15, 2010. These regulations adopted revised, enforceable accessibility standards called the 2010 ADA Standards for Accessible Design, "2010 Standards." On March 15, 2012, compliance with the 2010 Standards was required for new construction and alterations under Titles II and III. March 15, 2012, is also the compliance date for using the 2010 Standards for program accessibility and barrier removal.
The Department has assembled an official online version of the 2010 Standards to bring together the information in one easy-to-access location.  It provides the scoping and technical requirements for new construction and alterations resulting from the adoption of revised 2010 Standards in the final rules for Title II (28 CFR part 35) and Title III (28 CFR part 36).

According to the DOJ, “Being unable to access websites puts individuals with disabilities at a great disadvantage in today’s society.” With these words in mind, the DOJ has rapidly adopted the role of web accessibility enforcer. A failure to make digital content, including websites, accessible to all individuals regardless of their emotional, physical, or mental disabilities, can result in hefty fines and class action lawsuits. In short, the DOJ is dedicated to making sure that individuals with disabilities have the same equal access to the benefits that are available online. Creating equal access is only possible if organizations a) understand the requirements of web accessibility, b) know that web accessibility is an obligation under the ADA, and c) make web accessibility a priority. The value that awaits when organizations adhere to digital accessibility laws can be measured in more than dollars and cents.
The DOJ is currently working to release new technical standards for digital accessibility. The latter updates to the ADA guidelines will be in conjunction with the latest version of WCAG 2.1, which includes the most widely accepted digital accessibility requirements across the globe. If organizations want to overcome the current limitations of ADA guidelines, then they should follow the WCAG 2.1 checklist,11 as well as the suggestions provided by the ADA. The latter two steps, combined with the help of a trusted digital accessibility compliance platform,12 can help organizations achieve digital accessibility best in class standards throughout all of their digital formats and across all media.
I am passionate and dedicated designer tackling complex problems and finding creative solutions. I use language & content strategy to make design solutions that are intuitive, trusted, and easy to use. I put the users of my solution at the center of every decision I take. I have 5+ years of commercial projects experience at Ukrainian IT companies and 4 years at Upwork freelancer platform (projects with small budgets). Now I live in NYC area.

Thank you all for your comments.  In my world of space planning and design of commercial facilities of all types , job # 1 is to make sure you can exit a building in case of heavy smoke and fire and make sure that the space is handicapped accessible and that a disabled person can get out of a building in case of fire.  I have never heard of a handicapped accessible website, however the explanation of a website that refers to a physical space makes sense. Alt text to describe something on a website and /or possible audio enhancements also make sense.   That being said I am also very aware of real and let’s call them faux lawsuits and have concerns about opportunistic lawsuits.  They are already happening and to think that could morph into the web is frankly frightening,  

This is the exact opposite of mistake #1. Let me start by revealing a dirty little secret when it comes to website design. Most people think, Oh, I’m going to hire a professional website firm because I want a “real website” As opposed to a Word Press website or something else. And what most people don't realize is that all websites are made from the same stuff.
We recommend following the Web Content Accessibility Guidelines (WCAG) as best practice on your site, which is what our platform uses as the foundation for our accessibility guidelines. To see how accessible your site is according to WCAG, request a website audit using the form on this page. Your PDF report will be emailed to you within one business day, so you can start assessing the conformance of your site quickly. 
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The Department has assembled an official online version of the 2010 Standards to bring together the information in one easy-to-access location.  It provides the scoping and technical requirements for new construction and alterations resulting from the adoption of revised 2010 Standards in the final rules for Title II (28 CFR part 35) and Title III (28 CFR part 36).
It makes sense that everyone should have equal access to websites and online properties.  The Internet has become an integral part of our lives, where we go to shop, learn, do our banking, and socialize. The DOJ hasn’t determined what the final set of regulations for ADA compliant websites will be yet, but there are established guidelines and standards of accessibility that can be viewed on the ADA website. Once a website meets these accessibility standards it qualifies as ADA compliant.

Aside from attempting to compliant for compliance’s sake, having an ADA accessible website can improve the overall user experience and site traffic. An ADA compliant site can increase your target audience (by making it easy for those with disabilities to navigate around), improve your SEO efforts (by helping search engines to more easily crawl your pages and content), and help your overall reputation.
The ADA statute identifies who is a person with a disability, who has obligations under the ADA, general non-discrimination requirements and other basic obligations. It delegates fleshing out those obligations to federal agencies. The agencies issue regulations and design standards. The regulations have the details on the rights of people with disabilities and responsibilities of employers, state and local governments, transportation providers, businesses and non-profit organizations. The design standards specify how many entrances need to be accessible, how many toilet rooms and the design for those elements.  To know what the ADA requires, you need to read the law, regulations and design standards.