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| Original file line number | Diff line number | Diff line change |
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| @@ -1,206 +1,13 @@ | ||
| # storybook-addon-a11y | ||
| # Storybook Accessibility Addon | ||
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| This Storybook addon can be helpful to make your UI components more accessible. | ||
| The @storybook/addon-a11y package provides accessibility testing for Storybook stories. It uses axe-core to run the tests. | ||
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| [Framework Support](https://storybook.js.org/docs/configure/integration/frameworks-feature-support) | ||
| ## Getting Started | ||
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|  | ||
| ### Add the addon to an existing Storybook | ||
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| ## Getting started | ||
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| First, install the addon. | ||
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| ```sh | ||
| $ yarn add @storybook/addon-a11y --dev | ||
| ``` | ||
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| Add this line to your `main.js` file (create this file inside your Storybook config directory if needed). | ||
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| ```js | ||
| export default { | ||
| addons: ['@storybook/addon-a11y'], | ||
| }; | ||
| ``` | ||
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| And here's a sample story file to test the addon: | ||
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| ```js | ||
| import React from 'react'; | ||
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| export default { | ||
| title: 'button', | ||
| }; | ||
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| export const Accessible = () => <button>Accessible button</button>; | ||
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| export const Inaccessible = () => ( | ||
| <button style={{ backgroundColor: 'red', color: 'darkRed' }}>Inaccessible button</button> | ||
| ); | ||
| ``` | ||
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| ## Handling failing rules | ||
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| When Axe reports accessibility violations in stories, there are multiple ways to handle these failures depending on your needs. | ||
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| ### Story-level overrides | ||
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| At the Story level, override rules using `parameters.a11y.config.rules`. | ||
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| ```js | ||
| export const InputWithoutAutofill = () => <input type="text" autocomplete="nope" />; | ||
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| InputWithoutAutofill.parameters = { | ||
| a11y: { | ||
| // Avoid doing this, as it will fully disable all accessibility checks for this story. | ||
| disable: true, | ||
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| // Instead, override rules 👇 | ||
| // axe-core configurationOptions (https://github.com/dequelabs/axe-core/blob/develop/doc/API.md#parameters-1) | ||
| config: { | ||
| rules: [ | ||
| { | ||
| // You can exclude some elements from failing a specific rule: | ||
| id: 'autocomplete-valid', | ||
| selector: '*:not([autocomplete="nope"])', | ||
| }, | ||
| { | ||
| // You can also signify that a violation will need to be fixed in the future | ||
| // by overriding the result of a rule to return "Needs Review" | ||
| // rather than "Violation" if the rule fails: | ||
| id: 'landmark-complementary-is-top-level', | ||
| reviewOnFail: true, | ||
| }, | ||
| ], | ||
| }, | ||
| }, | ||
| }; | ||
| ``` | ||
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| Alternatively, you can disable specific rules in a Story: | ||
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| ```js | ||
| export const Inaccessible = () => ( | ||
| <button style={{ backgroundColor: 'red', color: 'darkRed' }}>Inaccessible button</button> | ||
| ); | ||
| Inaccessible.parameters = { | ||
| a11y: { | ||
| config: { | ||
| rules: [{ id: 'color-contrast', enabled: false }], | ||
| }, | ||
| }, | ||
| }; | ||
| ```bash | ||
| npx storybook add @storybook/addon-a11y | ||
| ``` | ||
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| Tip: clearly explain in a comment why a rule was overridden, it’ll help you and your team trace back why certain violations aren’t being reported or need to be addressed. For example: | ||
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| ```js | ||
| MyStory.parameters = { | ||
| a11y: { | ||
| config: { | ||
| rules: [ | ||
| { | ||
| // Allow `autocomplete="nope"` on form elements, | ||
| // a workaround to disable autofill in Chrome. | ||
| // @link https://bugs.chromium.org/p/chromium/issues/detail?id=468153 | ||
| id: 'autocomplete-valid', | ||
| selector: '*:not([autocomplete="nope"])', | ||
| }, | ||
| { | ||
| // @fixme Color contrast of subdued text fails, as raised in issue #123. | ||
| id: 'color-contrast', | ||
| reviewOnFail: true, | ||
| }, | ||
| ], | ||
| }, | ||
| }, | ||
| }; | ||
| ``` | ||
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| ### Global overrides | ||
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| When you want to ignore an accessibility rule or change its settings across all stories, set `parameters.a11y.config.rules` in your Storybook’s `preview.ts` file. This can be particularly useful for ignoring false positives commonly reported by Axe. | ||
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| ```ts | ||
| // .storybook/preview.ts | ||
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| export const parameters = { | ||
| a11y: { | ||
| config: { | ||
| rules: [ | ||
| { | ||
| // This tells Axe to run the 'autocomplete-valid' rule on selectors | ||
| // that match '*:not([autocomplete="nope"])' (all elements except [autocomplete="nope"]). | ||
| // This is the safest way of ignoring a violation across all stories, | ||
| // as Axe will only ignore very specific elements and keep reporting | ||
| // violations on other elements of this rule. | ||
| id: 'autocomplete-valid', | ||
| selector: '*:not([autocomplete="nope"])', | ||
| }, | ||
| { | ||
| // To disable a rule across all stories, set `enabled` to `false`. | ||
| // Use with caution: all violations of this rule will be ignored! | ||
| id: 'autocomplete-valid', | ||
| enabled: false, | ||
| }, | ||
| ], | ||
| }, | ||
| }, | ||
| }; | ||
| ``` | ||
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| ### Disabling checks | ||
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| If you wish to entirely disable `a11y` checks for a subset of stories, you can control this with story parameters: | ||
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| ```js | ||
| export const MyNonCheckedStory = () => <SomeComponent />; | ||
| MyNonCheckedStory.parameters = { | ||
| // Avoid doing this, as it fully disables all accessibility checks for this story, | ||
| // and consider the techniques described above. | ||
| a11y: { disable: true }, | ||
| }; | ||
| ``` | ||
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| ## Parameters | ||
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| For more customizability use parameters to configure [aXe options](https://github.com/dequelabs/axe-core/blob/develop/doc/API.md#api-name-axeconfigure). | ||
| You can override these options [at story level too](https://storybook.js.org/docs/react/configure/features-and-behavior#per-story-options). | ||
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| ```js | ||
| import React from 'react'; | ||
| import { addDecorator, addParameters, storiesOf } from '@storybook/react'; | ||
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| export default { | ||
| title: 'button', | ||
| parameters: { | ||
| a11y: { | ||
| // optional selector which element to inspect | ||
| element: '#storybook-root', | ||
| // axe-core configurationOptions (https://github.com/dequelabs/axe-core/blob/develop/doc/API.md#parameters-1) | ||
| config: {}, | ||
| // axe-core optionsParameter (https://github.com/dequelabs/axe-core/blob/develop/doc/API.md#options-parameter) | ||
| options: {}, | ||
| // optional flag to prevent the automatic check | ||
| manual: true, | ||
| }, | ||
| }, | ||
| }; | ||
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| export const accessible = () => <button>Accessible button</button>; | ||
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| export const inaccessible = () => ( | ||
| <button style={{ backgroundColor: 'red', color: 'darkRed' }}>Inaccessible button</button> | ||
| ); | ||
| ``` | ||
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| ## Automate accessibility tests with test runner | ||
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| The test runner does not apply any rules that you have set on your stories by default. You can configure the runner to correctly apply the rules by [following the guide on the Storybook docs](https://storybook.js.org/docs/writing-tests/accessibility-testing#automate-accessibility-tests-with-test-runner). | ||
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| ## Roadmap | ||
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| - Make UI accessible | ||
| - Show in story where violations are. | ||
| - Add more example tests | ||
| - Add tests | ||
| - Make CI integration possible | ||
| [More on getting started with the accessibility addon](https://storybook.js.org/docs/writing-tests/accessibility-testing#accessibility-checks-with-a11y-addon) |
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