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feat: add a11y autocomplete-valid #8520

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merged 5 commits into from
May 5, 2023
Merged

feat: add a11y autocomplete-valid #8520

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db072c3
feat: add a11y `autocomplete-valid`
cruessler Apr 19, 2023
c0b9cc1
feat: remove checks for appropriate field types
cruessler Apr 22, 2023
1ab4085
relax a little
dummdidumm May 5, 2023
d2dba32
Merge branch 'master' into a11y-autocomplete-valid
dummdidumm May 5, 2023
ee6e889
changelog
dummdidumm May 5, 2023
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5 changes: 5 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -7,6 +7,11 @@
* Update interpolated style directive properly when using spread ([#8438](https://github.com/sveltejs/svelte/issues/8438))
* Remove style directive property when value is `undefined` ([#8462](https://github.com/sveltejs/svelte/issues/8462))
* Ensure version is typed as `string` instead of the literal `__VERSION__` ([#8498](https://github.com/sveltejs/svelte/issues/8498))
* Add `a11y-autocomplete-valid` warning ([#8520](https://github.com/sveltejs/svelte/pull/8520))
* Handle nested array rest destructuring ([#8554](https://github.com/sveltejs/svelte/issues/8554), [#8552](https://github.com/sveltejs/svelte/issues/8552))
* Add `fullscreenElement` and `visibilityState` bindings for `<svelte:document>` ([#8507](https://github.com/sveltejs/svelte/pull/8507))
* Add `devicePixelRatio` binding for `<svelte:window>` ([#8285](https://github.com/sveltejs/svelte/issues/8285))
* Relax `a11y-no-redundant-roles` warning ([#8536](https://github.com/sveltejs/svelte/pull/8536))

## 3.58.0

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4 changes: 4 additions & 0 deletions src/compiler/compile/compiler_warnings.ts
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Expand Up @@ -162,6 +162,10 @@ export default {
code: 'a11y-missing-attribute',
message: `A11y: <${name}> element should have ${article} ${sequence} attribute`
}),
a11y_autocomplete_valid: (type: null | true | string, value: null | true | string) => ({
code: 'a11y-autocomplete-valid',
message: `A11y: The value '${value}' is not supported by the attribute 'autocomplete' on element <input type="${type}">`
}),
a11y_img_redundant_alt: {
code: 'a11y-img-redundant-alt',
message: 'A11y: Screenreaders already announce <img> elements as an image.'
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14 changes: 13 additions & 1 deletion src/compiler/compile/nodes/Element.ts
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Expand Up @@ -25,7 +25,7 @@ import { Literal } from 'estree';
import compiler_warnings from '../compiler_warnings';
import compiler_errors from '../compiler_errors';
import { ARIARoleDefinitionKey, roles, aria, ARIAPropertyDefinition, ARIAProperty } from 'aria-query';
import { is_interactive_element, is_non_interactive_element, is_non_interactive_roles, is_presentation_role, is_interactive_roles, is_hidden_from_screen_reader, is_semantic_role_element, is_abstract_role, is_static_element, has_disabled_attribute } from '../utils/a11y';
import { is_interactive_element, is_non_interactive_element, is_non_interactive_roles, is_presentation_role, is_interactive_roles, is_hidden_from_screen_reader, is_semantic_role_element, is_abstract_role, is_static_element, has_disabled_attribute, is_valid_autocomplete } from '../utils/a11y';

const aria_attributes = 'activedescendant atomic autocomplete busy checked colcount colindex colspan controls current describedby description details disabled dropeffect errormessage expanded flowto grabbed haspopup hidden invalid keyshortcuts label labelledby level live modal multiline multiselectable orientation owns placeholder posinset pressed readonly relevant required roledescription rowcount rowindex rowspan selected setsize sort valuemax valuemin valuenow valuetext'.split(' ');
const aria_attribute_set = new Set(aria_attributes);
Expand Down Expand Up @@ -849,6 +849,18 @@ export default class Element extends Node {
should_have_attribute(this, required_attributes, 'input type="image"');
}
}

// autocomplete-valid
const autocomplete = attribute_map.get('autocomplete');

if (type && autocomplete) {
const type_value = type.get_static_value();
const autocomplete_value = autocomplete.get_static_value();

if (!is_valid_autocomplete(type_value, autocomplete_value)) {
component.warn(autocomplete, compiler_warnings.a11y_autocomplete_valid(type_value, autocomplete_value));
}
}
}

if (this.name === 'img') {
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102 changes: 102 additions & 0 deletions src/compiler/compile/utils/a11y.ts
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Expand Up @@ -6,6 +6,7 @@ import {
} from 'aria-query';
import { AXObjects, AXObjectRoles, elementAXObjects } from 'axobject-query';
import Attribute from '../nodes/Attribute';
import { regex_whitespaces } from '../../utils/patterns';

const aria_roles = roles_map.keys();
const abstract_roles = new Set(aria_roles.filter(role => roles_map.get(role).abstract));
Expand Down Expand Up @@ -223,3 +224,104 @@ export function is_semantic_role_element(role: ARIARoleDefinitionKey, tag_name:
}
return false;
}

// https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#autofilling-form-controls:-the-autocomplete-attribute
const address_type_tokens = new Set(['shipping', 'billing']);
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I was not able to find any of the following tokens in either axobject-query or aria-query.

const autofill_field_name_tokens = new Set([
'',
'on',
'off',
'name',
'honorific-prefix',
'given-name',
'additional-name',
'family-name',
'honorific-suffix',
'nickname',
'username',
'new-password',
'current-password',
'one-time-code',
'organization-title',
'organization',
'street-address',
'address-line1',
'address-line2',
'address-line3',
'address-level4',
'address-level3',
'address-level2',
'address-level1',
'country',
'country-name',
'postal-code',
'cc-name',
'cc-given-name',
'cc-additional-name',
'cc-family-name',
'cc-number',
'cc-exp',
'cc-exp-month',
'cc-exp-year',
'cc-csc',
'cc-type',
'transaction-currency',
'transaction-amount',
'language',
'bday',
'bday-day',
'bday-month',
'bday-year',
'sex',
'url',
'photo'
]);
const contact_type_tokens = new Set(['home', 'work', 'mobile', 'fax', 'pager']);
const autofill_contact_field_name_tokens = new Set([
'tel',
'tel-country-code',
'tel-national',
'tel-area-code',
'tel-local',
'tel-local-prefix',
'tel-local-suffix',
'tel-extension',
'email',
'impp'
]);

export function is_valid_autocomplete(type: null | true | string, autocomplete: null | true | string) {
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The types come from the inferred return type of get_static_value. I was unsure whether to add them, but wanted to be cautious in order not to miss edge cases.

if (typeof autocomplete !== 'string' || typeof type !== 'string') {
return false;
}

const tokens = autocomplete.trim().toLowerCase().split(regex_whitespaces);

if (typeof tokens[0] === 'string' && tokens[0].startsWith('section-')) {
tokens.shift();
}

if (address_type_tokens.has(tokens[0])) {
tokens.shift();
}

if (autofill_field_name_tokens.has(tokens[0])) {
tokens.shift();
} else {
if (contact_type_tokens.has(tokens[0])) {
tokens.shift();
}

if (autofill_contact_field_name_tokens.has(tokens[0])) {
tokens.shift();
} else {
return false;
}
}

if (tokens[0] === 'webauthn') {
tokens.shift();
}

return tokens.length === 0;
}
21 changes: 21 additions & 0 deletions test/validator/samples/a11y-autocomplete-valid/input.svelte
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@@ -0,0 +1,21 @@
<!-- VALID -->
<input type="text" />
<input type="text" autocomplete="name" />
<input type="text" autocomplete="off" />
<input type="text" autocomplete="on" />
<input type="text" autocomplete="billing family-name" />
<input type="hidden" autocomplete="section-blue shipping street-address" />
<input type="text" autocomplete="section-somewhere shipping work email" />
<input type="text" autocomplete="section-somewhere shipping work email webauthn" />
<input type="text" autocomplete="SECTION-SOMEWHERE SHIPPING WORK EMAIL WEBAUTHN" />
<input type="TEXT" autocomplete="ON" />
<input type="email" autocomplete="url" />
<input type="text" autocomplete="section-blue shipping street-address" />
<input type="hidden" autocomplete="off" />
<input type="hidden" autocomplete="on" />
<input type="text" autocomplete="" />
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axe-core does not have this as an error, but does not apply the rule.

https://github.com/dequelabs/axe-core/blob/c7957d2e8be4bfd5c9aa678036fb945dd23a9c27/test/integration/rules/autocomplete-valid/autocomplete-valid.html

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@dummdidumm dummdidumm Apr 27, 2023 •
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I'd say let's relax this then to allow the empty and boolean value. We also need a test that checks if it succeeds if a synamic value is given, like autocomplete={foo}


<!-- INVALID -->
<input type="text" autocomplete />
<input type="text" autocomplete="incorrect" />
<input type="text" autocomplete="webauthn" />
38 changes: 38 additions & 0 deletions test/validator/samples/a11y-autocomplete-valid/warnings.json
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@@ -0,0 +1,38 @@
[
{
"code": "a11y-autocomplete-valid",
"end": {
"column": 31,
"line": 19
},
"message": "A11y: The value 'true' is not supported by the attribute 'autocomplete' on element <input type=\"text\">",
"start": {
"column": 19,
"line": 19
}
},
{
"code": "a11y-autocomplete-valid",
"end": {
"column": 43,
"line": 20
},
"message": "A11y: The value 'incorrect' is not supported by the attribute 'autocomplete' on element <input type=\"text\">",
"start": {
"column": 19,
"line": 20
}
},
{
"code": "a11y-autocomplete-valid",
"end": {
"column": 42,
"line": 21
},
"message": "A11y: The value 'webauthn' is not supported by the attribute 'autocomplete' on element <input type=\"text\">",
"start": {
"column": 19,
"line": 21
}
}
]