A human using a mouse / trackpad / keyboard / switch control / puffer / magnification tool / voice control / screen reader and Safari / Chrome / Firefox / Edge on a Windows / Mac / Linux desktop / laptop / tablet / phone in light / dark mode / high contrast mode with reduced motion enabled with smaller / larger text size uses the Web
More than a QAC TPGi's ARC Toolkit Microsoft Accessibility Insights Test using a screen reader (Links included later, plus more details in the appendix)
TPGi's ARC Toolkit This is a good tool to run to flag more errors. It provides an easy way of inspecting the accessibility of semantic structures such as headings, landmarks, links, buttons, form controls, and alt text.
Microsoft Accessibility Insights (Do the assessment option) This is a good tool to use next because it offers good coverage of the WCAG SC (Success Criteria). It’s a reasonably lengthy process, but gets faster with practice.
Test using a screen reader Check structure. Check interactions. Check alt text of images: does it convey the content and function of the image? Check form error handling. (Warning! This could get a bit hairy. ! )