Use the headers and id attributes to associate header cells with their corresponding data cells

[civicplus-github]

Reduced Test Case

https://fullcalendar.io/docs/debug-json-feed

Do you understand that if a reduced test case is not provided, we will intentionally delay triaging of your ticket?

• I understand

Which connector are you using (React/Angular/etc)?

No connector (vanilla JS)

Bug Description

The rendered full calendar table is not fully accessibility compliant. It does not use the headers and id attributes to associate header cells with their corresponding data cells. Example link to demonstrate the use of the headers and id attributes - https://www.accede-web.com/en/guidelines/html-css/additional-rules-for-compliance/in-complex-tables-use-the-headers-and-id-attributes-to-associate-header-cells-with-their-corresponding-data-cells/#:~:text=A%20data%20table%20is%20complex,all%20the%20cells.