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feat(new-rule): aria-braille-equivalent finds incorrect uses of aria-braille attributes #4107

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merged 5 commits into from Jul 31, 2023

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WilcoFiers
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This rule effectively checks two things:

  1. aria-braillelabel is only ever used on elements with an accessible name
  2. aria-brailleroledescription is only ever used on elements with aria-roledescription

Closes: #3955

@WilcoFiers WilcoFiers requested a review from a team as a code owner July 28, 2023 12:29
virtualNode
) {
const brailleLabel = virtualNode.attr('aria-braillelabel') ?? '';
if (!brailleLabel.trim()) {
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Should we use sanitize from our text functions here instead (similar to aria-label and aria-labelledby checks)?

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We probably shouldn't use it for aria-labelledby either. What sanitize does that trim doesn't do is replace duplicate whitespace characters in between words with single space characters. We don't need that here.

Suppose it doesn't matter much though. And if we do ever need to do this in a way that's different from trim it helps to have them in place.

"metadata": {
"impact": "serious",
"messages": {
"pass": "aria-braillelabel is not used on an element with no accessible text",
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Just simplifying the double negative.

Suggested change
"pass": "aria-braillelabel is not used on an element with no accessible text",
"pass": "aria-braillelabel is used on an element with accessible text",

virtualNode
) {
const brailleRoleDesc = virtualNode.attr('aria-brailleroledescription') ?? '';
if (!brailleRoleDesc.trim()) {
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Ditto for sanitize

return false;
}

if (roleDesc.trim() === '') {
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Should keep consistent use of if you're using !brailleRoleDesc.trim() or brailleRoleDesc.trim() === '')

"metadata": {
"impact": "serious",
"messages": {
"pass": "aria-brailleroledescription is not used on an element with no accessible text",
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Suggested change
"pass": "aria-brailleroledescription is not used on an element with no accessible text",
"pass": "aria-brailleroledescription is used on an element with aria-roledescription",

describe('when aria-braillelabel has text', () => {
it('returns false when the accessible name is empty', () => {
const params = checkSetup(`
<img id="target" alt="" aria-braillelabel="foo" />
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This brings up an interesting question. This element is essentially role=presentation and thus won't be seen by the accessibility tree and thus I assume braille machines. Do we want to fail for these cases or do something similar to button-name rule and add the presentational-role check?

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I think this should fail. There's no reason someone would put aria-braillelabel on an element like this. We might change how that works if this attribute ever goes on the prohibited attrs list, which is what I asked the ARIA WG about. I think that would be more appropriate. Until then I think this is reasonable.

Comment on lines +2 to +4
afterEach(() => {
axe.reset();
});
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I believe this isn't necessary

Suggested change
afterEach(() => {
axe.reset();
});

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Configuration isn't reverted until axe.reset() is called. It's not in testutils. Where would you think this might happen?

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@straker straker Jul 31, 2023

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The audit is reverted back to the original one in the beforeEach. Don't remember why we didn't use axe.reset there, maybe we should (in a different pr)? Either way, it's not strictly something that needs to hold up this pr.

assert.lengthOf(results.incomplete, 0);
});

it('fails when roledescription is empty but brailleroledescription is not', () => {
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I believe accessibleTextVirtual can throw in subtree text if the element doesn't have a child (See https://github.com/dequelabs/axe-core/blob/develop/test/integration/virtual-rules/button-name.js#L116-L125). If that's the case, we should add a test for incomplete.

straker
straker previously approved these changes Jul 31, 2023
@WilcoFiers WilcoFiers merged commit 6260a2f into develop Jul 31, 2023
17 checks passed
@WilcoFiers WilcoFiers deleted the aria-braille-equivalent branch July 31, 2023 16:34
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New rule: restrict use of aria-description and aria-braille*
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