How to set the appearance of the block on all pages if initially it is not active?

Question

JavaScript

There is a button "version for the visually impaired", by pressing which a block with a menu opens. How to make it so that if the block is active, then on other pages it was also initially active?

Answer 1

The site/application needs to remember the "visibility" state of the menu. This can be done using:
1. cookies
2. setting the appropriate parameter in the account settings