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Check that your site is accessible

It is about making the site friendly for disabled. I am no expert in this area, but I try to adhere to the first level at least. Easy to read for every adult aged 40 plus. I have identified 4 levels of accessibility (my own interpretation):

First level is to make it easy to read for ALL. Using no less than 16px font-size and good contrast between background and text. Distinct buttons, etc.

Second level is to enable keyboard navigation and other interactions. This will make it easier for ALL users.

Third level is to enable the site for screen readers.

Fourth level is to reduce flickering in order to help epilleptic users.

There are few free accessibility checkers online. I have found some useful links: