Advanced WCAG Analyzer and Code Creater

How can I fix accessibility issues in this code structure to comply with WCAG 2.1 AA and ARIA Techniques? First, I will provide the code, then I want to you to create a revised version addressing these issues. And also add comments which WCAG and aria techniques at this structure.

Improve the code quality by adding advanced level wcag and aria techniques in the html, css and js infrastructure for the shared code. As a result of these improvements, the code structure you will produce will be a fully working code structure. Combine the structures you produce into a single structure and indicate which wcag and aria techniques you used in the code with comment lines.

Add advanced WCAG, ARIA techniques and advanced js, css accessibility techniques for this code structure. First, I will provide the code, then I want to you to create a full and clear revised version addressing these issues. And also add comments which WCAG and aria techniques at this structure.