dai11y 18/08/2023 – Don’t use custom CSS scrollbars

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Don’t use custom CSS scrollbars

Eric Bailey writes a comprehensive article on why you should never, ever provide custom styling for your website’s scrollbars.

The post begins somewhat philosophically: Eric highlights the area of a browser window that is your responsibility (the web page) and then highlights what isn’t (the browser ‘furniture’, URL display, and yes, the scrollbar).

But it’s more than just ideological – people who use Windows themes or Forced Colors Mode / High Contrast Mode may be doing so for aesthetical reasons or because they have accessibility requirements. By overriding their choices, you’re potentially excluding them from being able to use your scrollbar. Windows, Eric reminds us, is incredibly popular – something that developers using shiny MacBooks can sometimes forget.

It is possible to set scrollbar width to 1px – the browser won’t stop you. This is obviously a bad idea. Eric’s point is that by taking on styling for the scrollbar, you’re taking on its WCAG requirements too. It’s now on you to ensure it has a large enough touch area, a high enough contrast, and so on. Eric evaluated a number of scrollbar-code-generators and none of them accounted for this stuff.

Modifying a scrollbar’s visuals breaks external consistency. “Digital literacy is also a spectrum. When digital things don’t look or behave the way they are expected to, people tend to internalize it as a personal failure—they broke something, they’ve been hacked, they’re being spied on, etc”.

Eric’s key takeaway is “maybe you should write less code and in doing so allow more people do more things”.

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