I’ve been able to fix the problem by changing the default-calendar-grid.php file to change the contents of the buttons that they noted above. I ended up replacing the chevron icons in the file with stylized “<” and “>” characters, respectively. This allows a screen reader to see that there is actually content within the button, and furthermore within the table header, and as a result fixes the errors it has with the calendar.
As a web developer, Ryan's work is what makes the magic happen. He spends most of his time creating custom websites, which involves turning the designers' visual mockups into code. It's lucky that he's such a good problem solver, because many of Ryan's projects involve working with clients to create complex custom functions. He's also one of the few developers in the country with extensive experience developing for the HubSpot CMS.
Level AA is a little more significant, and makes sites accessible to people with a wider range of disabilities, including the most common barriers to use. It won't impact the look and feel of the site as much as Level AAA compliance, though it does include guidance on color contrast and error identification. Most businesses should be aiming for Level AA conformity, and it appears to reflect the level of accessibility the DOJ expects. 
While legal considerations might be your biggest worry, making your site more accessible is simply good customer service. More than 39 million Americans are blind and another 246 million have "low vision," Another one million are deaf in the U.S. Add to that people with mobility issues that prevent them from using their hands and that's a huge portion of the country's buying power.

VisionCorps’ mission is to empower individuals with vision loss to attain independence. They understood that accessibility to the programs and resources on their website was vital to the success of their mission. They partnered with our agency to design a website that would become the model for other businesses looking to create accessible web design for individuals who are blind or vision-impaired.
Meanwhile, the Justice Dept. enforcement team is doing cramdowns over web sites and mobile apps. For example, PeaPod grocery delivery service, which Vu assisted when the Justice Dept. gave them a hard time. In addition, H&R Block was sued by the National Federation of the Blind and the Justice Dept. became a plaintiff in the case — H&R Block complied.
Eric Kazda is a leading expert in the interactive development industry with over fifteen years of experience. With a mastery of critical development technologies, Eric has crafted innovative award-winning work for clients both large and small. Coupling this knowledge with a real world understanding of usability and technological feasibility, his work is developed to be accessible by every user.
Higher search engine rankings is another potential benefit of voluntary compliance with the ADA. During your migration, an ADA specialist will audit it to detect and address usability challenges. These difficulties include the inability for search engine spiders to index your site easily. When you address such issues, your site will rank highly in search engines.
...the full and equal enjoyment of the goods, services, facilities, or accommodations of any place of "public accommodation" by any person who owns, leases, or operates a place of public accommodation. Public accommodations include most places of lodging (such as inns and hotels), recreation, transportation, education, and dining, along with stores, care providers, and places of public displays.
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