RE: Custom stylesheet question for LVTF

My quick thought is that example is workable although requires some extra effort.  It’s certainly a possibility that users with low vision might change list styles or even heading styles beyond just size, colors, spacing, but also with some marker such as via pseudo content ore list style type.

What I find personally more problematic is the ability to create CSS that actually overrides what needs to be override without overriding everything.  That is for me – I just need some enhancements to contrast, focus indicator, affordance, etc. without blowing away the whole visual appearance and ending up with something that looks totally different.   Since most browsers like Chrome don’t allow for user style sheets any styles added via Stylus for example are at the page level and certain sectors such as ids take precedence over others.  This makes actually changing text in rich editors and other situations very difficult.     Changing the color of some text to be darker such as text on a light background while not making text darker that is on a dark background is an issue.  Even for people who are knowledgeable about CSS implementing these often requires site specific style modification and time – it’s not easy and also not available on mobile devices.

Jonathan

From: Jim Allan <jimallan@tsbvi.edu>
Sent: Wednesday, April 22, 2020 1:20 PM
To: public-low-vision-a11y-tf <public-low-vision-a11y-tf@w3.org>; Wilco Fiers <wilco.fiers@deque.com>
Subject: Fwd: Custom stylesheet question for LVTF

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Hi LVTF,
We have a request for thoughts.
let's respond to the list.

Jim


---------- Forwarded message ---------
From: Wilco Fiers <wilco.fiers@deque.com<mailto:wilco.fiers@deque.com>>
Date: Thu, Apr 16, 2020 at 4:48 AM
Subject: Custom stylesheet question for LVTF
To: <jimallan@tsbvi.edu<mailto:jimallan@tsbvi.edu>>

Hey Jim,

The ACT-Rules community group had a question we wanted to get input on from the LVTF, I wasn't sure what channel to use to communicate. Please let me know if I need to go somewhere else for this.

The question is about custom stylesheets and as to whether or not code like this is a problem:

<div role="list">
  <li>Some content</li>
</div>


WCAG is a little vague on what should and shouldn't be expected from someone using custom stylesheets. I know tools like Stylish are relatively popular still to tweak the styles of a website, but it's pretty complicated to write a good custom stylesheet, especially if you want to make a robust one, which is where the above example comes in.

So our question breaks down into two;

1. How important does LVTF think custom stylesheets are, given how complex things have gotten To what extent does LVTF think page styles need to be configurable? How far does 1.3.1 go? I would expect it to include things like allowing changes at the element level, like tweaking font size, color, borders, spacing, etc. But what about more complex things like changing the layout of a menu, or to customise the style of a list?

2. What level of effort is reasonable to expect from someone using a custom stylesheet? If I with my custom stylesheet want to make sure all lists are marked up a certain way, is it reasonable to expect all lists to follow the HTML spec, or should the author of the custom stylesheet be expected to create a robust custom stylesheet which tries to anticipate odd uses of ul, ol and li elements?


For the example above, where ARIA is used in combination with a native HTML element, this is a programatically determined relationship, but it's invalid HTML; li elements must be contained in a ul, ol or menu element. I suspect this passes SC 1.3.1, but I don't think it is particularly reasonable to expect the author of a custom stylesheet to anticipate all the odd ways ARIA can interact with native elements.


So, long story, sorry about that, but it's a complicated question. I hope my explanation of it is clear enough. Please do ask if this needs further elaboration, or if I need to send this somewhere else.

Thanks for our time,

--
Wilco Fiers
Axe for Web product owner - Co-facilitator WCAG-ACT - Chair ACT-R


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