Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

[a11y] Fix: aria-haspop and aria-expanded attributes on list view button. #53693

Conversation

jorgefilipecosta
Copy link
Member

Part of #24796.
Currently, the list view button opens an additional UI (list view sidebar) but lacks aria-haspopup and aria-expanded tags. This PR addresses the issue.
Presently, the publish and sidebar buttons also trigger sidebars and already possess these attributes, ensuring this PR maintains uniformity across both elements.
A similar PR has been suggested for the inserter button at #53692.

Testing

  • Opened the post editor and verified that the aria-haspopup and aria-expanded attributes of the list view button are functioning as expected.
  • Repeated the process for the site editor.

@jorgefilipecosta jorgefilipecosta added [Focus] Accessibility (a11y) Changes that impact accessibility and need corresponding review (e.g. markup changes). [Feature] List View Menu item in the top toolbar to select blocks from a list of links. labels Aug 15, 2023
@github-actions
Copy link

github-actions bot commented Aug 15, 2023

Size Change: +10 B (0%)

Total Size: 1.51 MB

Filename Size Change
build/edit-post/index.min.js 35.4 kB +7 B (0%)
build/edit-site/index.min.js 91.1 kB +3 B (0%)
ℹ️ View Unchanged
Filename Size
build/a11y/index.min.js 955 B
build/annotations/index.min.js 2.69 kB
build/api-fetch/index.min.js 2.28 kB
build/autop/index.min.js 2.1 kB
build/blob/index.min.js 451 B
build/block-directory/index.min.js 7.01 kB
build/block-directory/style-rtl.css 1.02 kB
build/block-directory/style.css 1.02 kB
build/block-editor/content-rtl.css 4.26 kB
build/block-editor/content.css 4.25 kB
build/block-editor/default-editor-styles-rtl.css 381 B
build/block-editor/default-editor-styles.css 381 B
build/block-editor/index.min.js 213 kB
build/block-editor/style-rtl.css 15 kB
build/block-editor/style.css 15 kB
build/block-library/blocks/archives/editor-rtl.css 61 B
build/block-library/blocks/archives/editor.css 60 B
build/block-library/blocks/archives/style-rtl.css 90 B
build/block-library/blocks/archives/style.css 90 B
build/block-library/blocks/audio/editor-rtl.css 150 B
build/block-library/blocks/audio/editor.css 150 B
build/block-library/blocks/audio/style-rtl.css 122 B
build/block-library/blocks/audio/style.css 122 B
build/block-library/blocks/audio/theme-rtl.css 126 B
build/block-library/blocks/audio/theme.css 126 B
build/block-library/blocks/avatar/editor-rtl.css 116 B
build/block-library/blocks/avatar/editor.css 116 B
build/block-library/blocks/avatar/style-rtl.css 104 B
build/block-library/blocks/avatar/style.css 104 B
build/block-library/blocks/block/editor-rtl.css 305 B
build/block-library/blocks/block/editor.css 305 B
build/block-library/blocks/button/editor-rtl.css 584 B
build/block-library/blocks/button/editor.css 582 B
build/block-library/blocks/button/style-rtl.css 629 B
build/block-library/blocks/button/style.css 628 B
build/block-library/blocks/buttons/editor-rtl.css 337 B
build/block-library/blocks/buttons/editor.css 337 B
build/block-library/blocks/buttons/style-rtl.css 332 B
build/block-library/blocks/buttons/style.css 332 B
build/block-library/blocks/calendar/style-rtl.css 239 B
build/block-library/blocks/calendar/style.css 239 B
build/block-library/blocks/categories/editor-rtl.css 113 B
build/block-library/blocks/categories/editor.css 112 B
build/block-library/blocks/categories/style-rtl.css 124 B
build/block-library/blocks/categories/style.css 124 B
build/block-library/blocks/code/editor-rtl.css 53 B
build/block-library/blocks/code/editor.css 53 B
build/block-library/blocks/code/style-rtl.css 121 B
build/block-library/blocks/code/style.css 121 B
build/block-library/blocks/code/theme-rtl.css 124 B
build/block-library/blocks/code/theme.css 124 B
build/block-library/blocks/columns/editor-rtl.css 108 B
build/block-library/blocks/columns/editor.css 108 B
build/block-library/blocks/columns/style-rtl.css 421 B
build/block-library/blocks/columns/style.css 421 B
build/block-library/blocks/comment-author-avatar/editor-rtl.css 125 B
build/block-library/blocks/comment-author-avatar/editor.css 125 B
build/block-library/blocks/comment-content/style-rtl.css 92 B
build/block-library/blocks/comment-content/style.css 92 B
build/block-library/blocks/comment-template/style-rtl.css 199 B
build/block-library/blocks/comment-template/style.css 198 B
build/block-library/blocks/comments-pagination-numbers/editor-rtl.css 123 B
build/block-library/blocks/comments-pagination-numbers/editor.css 121 B
build/block-library/blocks/comments-pagination/editor-rtl.css 222 B
build/block-library/blocks/comments-pagination/editor.css 209 B
build/block-library/blocks/comments-pagination/style-rtl.css 235 B
build/block-library/blocks/comments-pagination/style.css 231 B
build/block-library/blocks/comments-title/editor-rtl.css 75 B
build/block-library/blocks/comments-title/editor.css 75 B
build/block-library/blocks/comments/editor-rtl.css 840 B
build/block-library/blocks/comments/editor.css 839 B
build/block-library/blocks/comments/style-rtl.css 637 B
build/block-library/blocks/comments/style.css 636 B
build/block-library/blocks/cover/editor-rtl.css 647 B
build/block-library/blocks/cover/editor.css 650 B
build/block-library/blocks/cover/style-rtl.css 1.63 kB
build/block-library/blocks/cover/style.css 1.62 kB
build/block-library/blocks/details/editor-rtl.css 65 B
build/block-library/blocks/details/editor.css 65 B
build/block-library/blocks/details/style-rtl.css 98 B
build/block-library/blocks/details/style.css 98 B
build/block-library/blocks/embed/editor-rtl.css 293 B
build/block-library/blocks/embed/editor.css 293 B
build/block-library/blocks/embed/style-rtl.css 410 B
build/block-library/blocks/embed/style.css 410 B
build/block-library/blocks/embed/theme-rtl.css 126 B
build/block-library/blocks/embed/theme.css 126 B
build/block-library/blocks/file/editor-rtl.css 316 B
build/block-library/blocks/file/editor.css 316 B
build/block-library/blocks/file/style-rtl.css 280 B
build/block-library/blocks/file/style.css 281 B
build/block-library/blocks/file/view-interactivity.min.js 317 B
build/block-library/blocks/file/view.min.js 375 B
build/block-library/blocks/footnotes/style-rtl.css 201 B
build/block-library/blocks/footnotes/style.css 199 B
build/block-library/blocks/freeform/editor-rtl.css 2.61 kB
build/block-library/blocks/freeform/editor.css 2.61 kB
build/block-library/blocks/gallery/editor-rtl.css 947 B
build/block-library/blocks/gallery/editor.css 952 B
build/block-library/blocks/gallery/style-rtl.css 1.53 kB
build/block-library/blocks/gallery/style.css 1.53 kB
build/block-library/blocks/gallery/theme-rtl.css 108 B
build/block-library/blocks/gallery/theme.css 108 B
build/block-library/blocks/group/editor-rtl.css 654 B
build/block-library/blocks/group/editor.css 654 B
build/block-library/blocks/group/style-rtl.css 57 B
build/block-library/blocks/group/style.css 57 B
build/block-library/blocks/group/theme-rtl.css 78 B
build/block-library/blocks/group/theme.css 78 B
build/block-library/blocks/heading/style-rtl.css 76 B
build/block-library/blocks/heading/style.css 76 B
build/block-library/blocks/html/editor-rtl.css 336 B
build/block-library/blocks/html/editor.css 337 B
build/block-library/blocks/image/editor-rtl.css 834 B
build/block-library/blocks/image/editor.css 833 B
build/block-library/blocks/image/style-rtl.css 1.42 kB
build/block-library/blocks/image/style.css 1.41 kB
build/block-library/blocks/image/theme-rtl.css 126 B
build/block-library/blocks/image/theme.css 126 B
build/block-library/blocks/image/view-interactivity.min.js 1.83 kB
build/block-library/blocks/latest-comments/style-rtl.css 357 B
build/block-library/blocks/latest-comments/style.css 357 B
build/block-library/blocks/latest-posts/editor-rtl.css 213 B
build/block-library/blocks/latest-posts/editor.css 212 B
build/block-library/blocks/latest-posts/style-rtl.css 478 B
build/block-library/blocks/latest-posts/style.css 478 B
build/block-library/blocks/list/style-rtl.css 88 B
build/block-library/blocks/list/style.css 88 B
build/block-library/blocks/media-text/editor-rtl.css 266 B
build/block-library/blocks/media-text/editor.css 263 B
build/block-library/blocks/media-text/style-rtl.css 505 B
build/block-library/blocks/media-text/style.css 503 B
build/block-library/blocks/more/editor-rtl.css 431 B
build/block-library/blocks/more/editor.css 431 B
build/block-library/blocks/navigation-link/editor-rtl.css 712 B
build/block-library/blocks/navigation-link/editor.css 711 B
build/block-library/blocks/navigation-link/style-rtl.css 115 B
build/block-library/blocks/navigation-link/style.css 115 B
build/block-library/blocks/navigation-submenu/editor-rtl.css 296 B
build/block-library/blocks/navigation-submenu/editor.css 295 B
build/block-library/blocks/navigation/editor-rtl.css 2.26 kB
build/block-library/blocks/navigation/editor.css 2.26 kB
build/block-library/blocks/navigation/style-rtl.css 2.23 kB
build/block-library/blocks/navigation/style.css 2.22 kB
build/block-library/blocks/navigation/view-interactivity.min.js 988 B
build/block-library/blocks/navigation/view-modal.min.js 2.85 kB
build/block-library/blocks/navigation/view.min.js 469 B
build/block-library/blocks/nextpage/editor-rtl.css 395 B
build/block-library/blocks/nextpage/editor.css 395 B
build/block-library/blocks/page-list/editor-rtl.css 401 B
build/block-library/blocks/page-list/editor.css 401 B
build/block-library/blocks/page-list/style-rtl.css 175 B
build/block-library/blocks/page-list/style.css 175 B
build/block-library/blocks/paragraph/editor-rtl.css 174 B
build/block-library/blocks/paragraph/editor.css 174 B
build/block-library/blocks/paragraph/style-rtl.css 279 B
build/block-library/blocks/paragraph/style.css 281 B
build/block-library/blocks/post-author/style-rtl.css 175 B
build/block-library/blocks/post-author/style.css 176 B
build/block-library/blocks/post-comments-form/editor-rtl.css 96 B
build/block-library/blocks/post-comments-form/editor.css 96 B
build/block-library/blocks/post-comments-form/style-rtl.css 508 B
build/block-library/blocks/post-comments-form/style.css 508 B
build/block-library/blocks/post-date/style-rtl.css 61 B
build/block-library/blocks/post-date/style.css 61 B
build/block-library/blocks/post-excerpt/editor-rtl.css 71 B
build/block-library/blocks/post-excerpt/editor.css 71 B
build/block-library/blocks/post-excerpt/style-rtl.css 141 B
build/block-library/blocks/post-excerpt/style.css 141 B
build/block-library/blocks/post-featured-image/editor-rtl.css 588 B
build/block-library/blocks/post-featured-image/editor.css 586 B
build/block-library/blocks/post-featured-image/style-rtl.css 319 B
build/block-library/blocks/post-featured-image/style.css 319 B
build/block-library/blocks/post-navigation-link/style-rtl.css 153 B
build/block-library/blocks/post-navigation-link/style.css 153 B
build/block-library/blocks/post-template/editor-rtl.css 99 B
build/block-library/blocks/post-template/editor.css 98 B
build/block-library/blocks/post-template/style-rtl.css 314 B
build/block-library/blocks/post-template/style.css 314 B
build/block-library/blocks/post-terms/style-rtl.css 96 B
build/block-library/blocks/post-terms/style.css 96 B
build/block-library/blocks/post-time-to-read/style-rtl.css 69 B
build/block-library/blocks/post-time-to-read/style.css 69 B
build/block-library/blocks/post-title/style-rtl.css 100 B
build/block-library/blocks/post-title/style.css 100 B
build/block-library/blocks/preformatted/style-rtl.css 125 B
build/block-library/blocks/preformatted/style.css 125 B
build/block-library/blocks/pullquote/editor-rtl.css 135 B
build/block-library/blocks/pullquote/editor.css 135 B
build/block-library/blocks/pullquote/style-rtl.css 335 B
build/block-library/blocks/pullquote/style.css 335 B
build/block-library/blocks/pullquote/theme-rtl.css 168 B
build/block-library/blocks/pullquote/theme.css 168 B
build/block-library/blocks/query-pagination-numbers/editor-rtl.css 122 B
build/block-library/blocks/query-pagination-numbers/editor.css 121 B
build/block-library/blocks/query-pagination/editor-rtl.css 221 B
build/block-library/blocks/query-pagination/editor.css 211 B
build/block-library/blocks/query-pagination/style-rtl.css 302 B
build/block-library/blocks/query-pagination/style.css 299 B
build/block-library/blocks/query-title/style-rtl.css 63 B
build/block-library/blocks/query-title/style.css 63 B
build/block-library/blocks/query/editor-rtl.css 450 B
build/block-library/blocks/query/editor.css 449 B
build/block-library/blocks/quote/style-rtl.css 222 B
build/block-library/blocks/quote/style.css 222 B
build/block-library/blocks/quote/theme-rtl.css 223 B
build/block-library/blocks/quote/theme.css 226 B
build/block-library/blocks/read-more/style-rtl.css 132 B
build/block-library/blocks/read-more/style.css 132 B
build/block-library/blocks/rss/editor-rtl.css 149 B
build/block-library/blocks/rss/editor.css 149 B
build/block-library/blocks/rss/style-rtl.css 289 B
build/block-library/blocks/rss/style.css 288 B
build/block-library/blocks/search/editor-rtl.css 178 B
build/block-library/blocks/search/editor.css 178 B
build/block-library/blocks/search/style-rtl.css 607 B
build/block-library/blocks/search/style.css 607 B
build/block-library/blocks/search/theme-rtl.css 114 B
build/block-library/blocks/search/theme.css 114 B
build/block-library/blocks/search/view.min.js 631 B
build/block-library/blocks/separator/editor-rtl.css 146 B
build/block-library/blocks/separator/editor.css 146 B
build/block-library/blocks/separator/style-rtl.css 234 B
build/block-library/blocks/separator/style.css 234 B
build/block-library/blocks/separator/theme-rtl.css 194 B
build/block-library/blocks/separator/theme.css 194 B
build/block-library/blocks/shortcode/editor-rtl.css 323 B
build/block-library/blocks/shortcode/editor.css 323 B
build/block-library/blocks/site-logo/editor-rtl.css 754 B
build/block-library/blocks/site-logo/editor.css 754 B
build/block-library/blocks/site-logo/style-rtl.css 203 B
build/block-library/blocks/site-logo/style.css 203 B
build/block-library/blocks/site-tagline/editor-rtl.css 86 B
build/block-library/blocks/site-tagline/editor.css 86 B
build/block-library/blocks/site-title/editor-rtl.css 116 B
build/block-library/blocks/site-title/editor.css 116 B
build/block-library/blocks/site-title/style-rtl.css 57 B
build/block-library/blocks/site-title/style.css 57 B
build/block-library/blocks/social-link/editor-rtl.css 184 B
build/block-library/blocks/social-link/editor.css 184 B
build/block-library/blocks/social-links/editor-rtl.css 682 B
build/block-library/blocks/social-links/editor.css 681 B
build/block-library/blocks/social-links/style-rtl.css 1.44 kB
build/block-library/blocks/social-links/style.css 1.43 kB
build/block-library/blocks/spacer/editor-rtl.css 348 B
build/block-library/blocks/spacer/editor.css 348 B
build/block-library/blocks/spacer/style-rtl.css 48 B
build/block-library/blocks/spacer/style.css 48 B
build/block-library/blocks/table/editor-rtl.css 432 B
build/block-library/blocks/table/editor.css 432 B
build/block-library/blocks/table/style-rtl.css 639 B
build/block-library/blocks/table/style.css 639 B
build/block-library/blocks/table/theme-rtl.css 146 B
build/block-library/blocks/table/theme.css 146 B
build/block-library/blocks/tag-cloud/style-rtl.css 251 B
build/block-library/blocks/tag-cloud/style.css 253 B
build/block-library/blocks/template-part/editor-rtl.css 403 B
build/block-library/blocks/template-part/editor.css 403 B
build/block-library/blocks/template-part/theme-rtl.css 101 B
build/block-library/blocks/template-part/theme.css 101 B
build/block-library/blocks/term-description/style-rtl.css 111 B
build/block-library/blocks/term-description/style.css 111 B
build/block-library/blocks/text-columns/editor-rtl.css 95 B
build/block-library/blocks/text-columns/editor.css 95 B
build/block-library/blocks/text-columns/style-rtl.css 166 B
build/block-library/blocks/text-columns/style.css 166 B
build/block-library/blocks/verse/style-rtl.css 99 B
build/block-library/blocks/verse/style.css 99 B
build/block-library/blocks/video/editor-rtl.css 552 B
build/block-library/blocks/video/editor.css 555 B
build/block-library/blocks/video/style-rtl.css 185 B
build/block-library/blocks/video/style.css 185 B
build/block-library/blocks/video/theme-rtl.css 126 B
build/block-library/blocks/video/theme.css 126 B
build/block-library/classic-rtl.css 179 B
build/block-library/classic.css 179 B
build/block-library/common-rtl.css 1.1 kB
build/block-library/common.css 1.1 kB
build/block-library/editor-elements-rtl.css 75 B
build/block-library/editor-elements.css 75 B
build/block-library/editor-rtl.css 12.1 kB
build/block-library/editor.css 12.1 kB
build/block-library/elements-rtl.css 54 B
build/block-library/elements.css 54 B
build/block-library/index.min.js 203 kB
build/block-library/reset-rtl.css 478 B
build/block-library/reset.css 478 B
build/block-library/style-rtl.css 13.8 kB
build/block-library/style.css 13.8 kB
build/block-library/theme-rtl.css 688 B
build/block-library/theme.css 693 B
build/block-serialization-default-parser/index.min.js 1.12 kB
build/block-serialization-spec-parser/index.min.js 2.87 kB
build/blocks/index.min.js 51.2 kB
build/commands/index.min.js 15.5 kB
build/commands/style-rtl.css 932 B
build/commands/style.css 929 B
build/components/index.min.js 245 kB
build/components/style-rtl.css 11.8 kB
build/components/style.css 11.8 kB
build/compose/index.min.js 12.1 kB
build/core-commands/index.min.js 2.72 kB
build/core-data/index.min.js 16.8 kB
build/customize-widgets/index.min.js 12.1 kB
build/customize-widgets/style-rtl.css 1.46 kB
build/customize-widgets/style.css 1.45 kB
build/data-controls/index.min.js 640 B
build/data/index.min.js 8.38 kB
build/date/index.min.js 17.8 kB
build/deprecated/index.min.js 451 B
build/dom-ready/index.min.js 324 B
build/dom/index.min.js 4.64 kB
build/edit-post/classic-rtl.css 544 B
build/edit-post/classic.css 545 B
build/edit-post/style-rtl.css 7.62 kB
build/edit-post/style.css 7.62 kB
build/edit-site/style-rtl.css 13.2 kB
build/edit-site/style.css 13.2 kB
build/edit-widgets/index.min.js 16.9 kB
build/edit-widgets/style-rtl.css 4.52 kB
build/edit-widgets/style.css 4.52 kB
build/editor/index.min.js 45.5 kB
build/editor/style-rtl.css 3.53 kB
build/editor/style.css 3.52 kB
build/element/index.min.js 4.82 kB
build/escape-html/index.min.js 537 B
build/format-library/index.min.js 7.59 kB
build/format-library/style-rtl.css 554 B
build/format-library/style.css 553 B
build/hooks/index.min.js 1.55 kB
build/html-entities/index.min.js 448 B
build/i18n/index.min.js 3.58 kB
build/interactivity/index.min.js 10.4 kB
build/is-shallow-equal/index.min.js 527 B
build/keyboard-shortcuts/index.min.js 1.64 kB
build/keycodes/index.min.js 1.87 kB
build/list-reusable-blocks/index.min.js 2.2 kB
build/list-reusable-blocks/style-rtl.css 836 B
build/list-reusable-blocks/style.css 836 B
build/media-utils/index.min.js 2.9 kB
build/notices/index.min.js 948 B
build/nux/index.min.js 1.99 kB
build/nux/style-rtl.css 735 B
build/nux/style.css 732 B
build/patterns/index.min.js 2.71 kB
build/patterns/style-rtl.css 240 B
build/patterns/style.css 240 B
build/plugins/index.min.js 1.79 kB
build/preferences-persistence/index.min.js 1.84 kB
build/preferences/index.min.js 1.24 kB
build/primitives/index.min.js 943 B
build/priority-queue/index.min.js 1.52 kB
build/private-apis/index.min.js 958 B
build/react-i18n/index.min.js 615 B
build/react-refresh-entry/index.min.js 9.47 kB
build/react-refresh-runtime/index.min.js 7.31 kB
build/redux-routine/index.min.js 2.7 kB
build/reusable-blocks/index.min.js 2.7 kB
build/reusable-blocks/style-rtl.css 243 B
build/reusable-blocks/style.css 243 B
build/rich-text/index.min.js 11 kB
build/router/index.min.js 1.78 kB
build/server-side-render/index.min.js 1.94 kB
build/shortcode/index.min.js 1.39 kB
build/style-engine/index.min.js 1.85 kB
build/sync/index.min.js 53.8 kB
build/token-list/index.min.js 582 B
build/url/index.min.js 3.73 kB
build/vendors/inert-polyfill.min.js 2.48 kB
build/vendors/react-dom.min.js 41.8 kB
build/vendors/react.min.js 4.02 kB
build/viewport/index.min.js 958 B
build/warning/index.min.js 249 B
build/widgets/index.min.js 7.16 kB
build/widgets/style-rtl.css 1.15 kB
build/widgets/style.css 1.16 kB
build/wordcount/index.min.js 1.02 kB

compressed-size-action

Copy link
Contributor

@alexstine alexstine left a comment

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

This mostly looks good but please remove aria-haspopup. This is used incorrectly here.

https://developer.mozilla.org/en-US/docs/Web/Accessibility/ARIA/Attributes/aria-haspopup

In ARIA, interactive menus, listboxes, trees, grids, and dialogs that appear on top of other content when triggered to appear are considered "popups".

@@ -265,6 +265,8 @@ export default function HeaderEditMode() {
? 'tertiary'
: undefined
}
aria-haspopup="true"
Copy link
Contributor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Delete this attribute.

@@ -107,6 +107,8 @@ function HeaderToolbar() {
shortcut={ listViewShortcut }
showTooltip={ ! showIconLabels }
variant={ showIconLabels ? 'tertiary' : undefined }
aria-haspopup="true"
Copy link
Contributor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Delete this attribute.

@jorgefilipecosta jorgefilipecosta force-pushed the a11y/fix-aria-haspop-aria-expanded-attributes-on-list-view-button branch from d419080 to 3751564 Compare August 22, 2023 16:58
@jorgefilipecosta
Copy link
Member Author

Thank you for the review @alexstine, the feedback was applied.

Copy link
Contributor

@alexstine alexstine left a comment

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

👍 🚢

@jorgefilipecosta jorgefilipecosta merged commit a2756b6 into trunk Aug 23, 2023
49 of 50 checks passed
@jorgefilipecosta jorgefilipecosta deleted the a11y/fix-aria-haspop-aria-expanded-attributes-on-list-view-button branch August 23, 2023 09:17
@github-actions github-actions bot added this to the Gutenberg 16.6 milestone Aug 23, 2023
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Labels
[Feature] List View Menu item in the top toolbar to select blocks from a list of links. [Focus] Accessibility (a11y) Changes that impact accessibility and need corresponding review (e.g. markup changes).
Projects
None yet
Development

Successfully merging this pull request may close these issues.

None yet

2 participants