Coming from #2467863: Login form's aria-describeby points to an element that doesn't exist → @crasx correctly points out that it would be better to fix this centrally:
Could we add something to the render layer to remove the aria-describedby if there is no description attribute or does this need to be done on a form by form basis?
This would be a better solution to ensure that Drupal forms are semantically correct and not introducing accessibility errors.
It would be best to remove the aria-describedby introduced in FAPI if there is no description available for the form element.
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It affects the ability of people with disabilities or special needs (such as blindness or color-blindness) to use Drupal.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I have seen this in Views exposed filters. The aria-describedby attribute is added in core/lib/Drupal/Core/Form/FormBuilder.php. The description elements would be created in core/includes/form.inc. Adding some ksm() calls, I see that #description has content in FormBuilder.php but is the empty string in form.inc.