Thanks for your reply！
The Mozilla Web Docs say " According to the fourth rule of ARIA, aria-hidden="true" should not be used on a focusable element. Additionally, since this attribute is inherited by an element’s children, it should not be added onto the parent or ancestor of a focusable element."
The developer used the code to define a button that is focusable. It seems he can not add “aira-hidden=true” here.
En,perhap I have no choices but disable this rule. It is a pity. I still think it make sense to use instead of ，the intention of this rule.