Had a question about this aria-multieline=false failing the aria-allowed-attr rule. This doesn't seem to impact screen reader use. Instead of raising this as an issue I think it would be better to report this as needing review. If at some point in the lifecycle of that component the state changes to true, there is a problem (since this information won't be available in the accessibility tree). But while this is false, failing this is inappropriate.
This fix should only apply to attributes that are allowed "false" as a value. The same probably holds for attributes with "undefined" as a valid value. That's rare though.
Update
Turns out the reason people sometimes do this is to avoid an issue where VoiceOver announces elements with contenteditable as multiline. Since a combobox cannot be multiline, this attribute is needed to ensure its announced as being a single line. So while I think the above example should incomplete, I think if this happens on an element with contenteditable axe-core should pass the rule:
<!-- This passes -->
<div aria-multiline="false" tabindex="0" aria-labelledby="foo" role="combobox" contenteditable>
Had a question about this
aria-multieline=falsefailing the aria-allowed-attr rule. This doesn't seem to impact screen reader use. Instead of raising this as an issue I think it would be better to report this as needing review. If at some point in the lifecycle of that component the state changes to true, there is a problem (since this information won't be available in the accessibility tree). But while this is false, failing this is inappropriate.This fix should only apply to attributes that are allowed "false" as a value. The same probably holds for attributes with "undefined" as a valid value. That's rare though.
Update
Turns out the reason people sometimes do this is to avoid an issue where VoiceOver announces elements with
contenteditableas multiline. Since a combobox cannot be multiline, this attribute is needed to ensure its announced as being a single line. So while I think the above example should incomplete, I think if this happens on an element withcontenteditableaxe-core should pass the rule: