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The accessibility rating for 5 popular websites — how did they score?

Disclaimer: I am using a free accessibility checker. I cannot say definitively that AccessibilityChecker.org is comprehensively auditing these sites with 100% accuracy. I am also only scanning the homepages of the sites.
How did the some of the most popular websites in the world score on an accessibility checker?
I ran the top websites through an accessibility checker. For the products I support at my company, I use Site Improve which does a great job of identifying accessibility issues needing fixing. However, since I couldn’t use my company account for all these sites, I’m using AccessibilityChecker.org (AC for reference in this article). I imagine these companies are fully aware of some of the accessibility deficiencies and likely have some intentional reasons for why they can’t or won’t comply with some methods and standards.
1. YouTube.com


YouTube scored a 60/100. AC highlighted a disabled zoom functionality and missing [lang] attribute on HTML elements as the major sever outliers.
Issues with ARIA labels, lack of unique IDs, missing alt attribute on some image elements, some quirky HTML table problems and a handful of other issues make up the secondary set of problems.
2. Amazon.com


Amazon scored 57/100. Some form elements missing associated labels, users cannot freeze GIFs and other animated projects are some the priority issues.