Observation Details
The close button of the "league collapsibles" is using ARIA to hide it from screen readers. It also is not using a semantic button element (see 1.3.1 Info and Relationships).
Remediation Notes
As the displayed content of expanded sections is not interfering with other content, this observation does not fail the current success criterion. It does however fail 1.3.1 Info and Relationships. Ensure every element that is used as a button, is actually using a semantic HTML button element to do so.
Please (also) refer to observation 1.3.1 Info and Relationships – "Semantic HTML" for general remarks about the use of semantic HTML.