I’ve just been updating a website for a dyslexia association, and was checking its ‘reader view’
Reader view is available for this website in IOS and Android and Desktop OS on Safari, Chrome and Firefox.
It allows for the viewer to see just the text
(no background or shapes) and for it to have its font changed and its size easily altered.
The above screenshots are from a Mac Desktop using the Firefox browser and an extension that puts an icon in the browser
Safari in both IOS and Desktop has reader view built in and apparently Chrome in Android does too but I haven’t tested that.
Remember also, you can zoom in on your browser to increase font size on a desktop screen, or pinch & expand on a touch device.
A good guide to fonts and spacing for dyslexic viewers is here