Accessible websites are higher quality websites. The article mentions SiteImprove, a commercial service that can be used to assess website accessibility. But that's not appropriate for everyone. Want to improve yours but don't know where to start? Here are a few options:
The HTML validator isn't specifically aimed at accessibility issues but it does highlight some low-lying fruit. All 3 of these are free and easy to use. WAVE is the most helpful IMO.
* WAVE add-on for Firefox (free): https://addons.mozilla.org/en-US/firefox/addon/wave-accessib...
* Google LightHouse (free, part of Chrome): Developer Tools -> Audits
* HTML Validator: https://html5.validator.nu/
The HTML validator isn't specifically aimed at accessibility issues but it does highlight some low-lying fruit. All 3 of these are free and easy to use. WAVE is the most helpful IMO.