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a11y: Prevent sidebar focus in site editor on small screens #55934

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merged 1 commit into from Nov 8, 2023

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@t-hamano t-hamano commented Nov 7, 2023

Fixes #55908

What?

This PR fixes an issue where focus could be moved to invisible elements in the sidebar of the site editor on small screens.

Why?

When you do not want the focus to move to the sidebar, it is expected to apply the inert attribute. This attribute is controlled by the showSidebar attribute, but in the case of mobile viewports, the only condition is that it is not a list page (All Templates, All Template Parts, All Pages), and canvas mode was not taken into account.

How?

Added the condition that canvas mode is view mode.

Testing Instructions

  • Reduce the browser width to 781px or less
  • At the same time, monitor the element with the edit-site-layout__sidebar class in the developer tools.
  • Open the site editor.
  • The sidebar will not have the inert attribute, and you should be able to move focus properly using the keyboard.
  • Open the canvas.
  • The inert attribute is given to the sidebar, and no invisible focus movement should occur.

Warning
While writing this pull request, I discovered an issue with screen reader shortcuts in the block editor. This is summarized in #55931.

Screenshots or screencast

0df04ff7f9a665301820b82d5ff5d1af.mp4

@t-hamano t-hamano added [Focus] Accessibility (a11y) Changes that impact accessibility and need corresponding review (e.g. markup changes). [Package] Edit Site /packages/edit-site labels Nov 7, 2023
@t-hamano t-hamano self-assigned this Nov 7, 2023
@t-hamano t-hamano added the [Type] Bug An existing feature does not function as intended label Nov 7, 2023
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github-actions bot commented Nov 7, 2023

Size Change: +1 B (0%)

Total Size: 1.7 MB

Filename Size Change
build/edit-site/index.min.js 209 kB +1 B (0%)
ℹ️ View Unchanged
Filename Size
build/a11y/index.min.js 964 B
build/annotations/index.min.js 2.71 kB
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compressed-size-action

inert={ showSidebar ? undefined : 'inert' }
inert={ showSidebar ? undefined : 'true' }
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I think this is a typo because the value of the inert attribute is supposed to be a boolean value. Perhaps values other than false are implicitly treated as true.

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Thanks for saying it was a typo to cover me, but I believe that was my doing. I think I just got it wrong 😅 Nice catch!

@t-hamano t-hamano marked this pull request as ready for review November 7, 2023 14:17
Comment on lines +119 to 120
( isMobileViewport && canvasMode === 'view' && ! isListPage ) ||
( ! isMobileViewport && ( canvasMode === 'view' || ! isEditorPage ) );
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@jeryj jeryj Nov 7, 2023

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Could this logic be simplified? The checks in both instances are pretty similar now, and isEditorPage is defined as: const isEditorPage = ! isListPage;. On larger screens, the check canvasMode === 'view' is enough to get it to be true. Maybe all we need is canvasMode === 'view'?

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Thanks for the review!

Maybe all we need is canvasMode === 'view'?

I tried to find out why each viewport has a condition, and why isEditorPage and isListPage are included in the conditions.

One reason seems to be to properly control the sidebar on the Pattern page.

On the Pattern page, canvasMode is always view regardless of the viewport. However, in the mobile viewport, when a pattern category is selected, the sidebar must be hidden even if the canvasMode is view. Otherwise, the two regions, sidebar and pattern content, will be rendered overlapping, as shown in the screenshot below.

I believe that avoiding this is the reason for such complicated conditions.

navigatable-region

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Ah, thanks for looking into this! I played around with it as well, and I think we could remove the ! isEditorPage from the not mobile conditional, but since that isn't related to this PR it could be a follow-up if you also think it should be removed.

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✅ Nice research!

@jeryj jeryj merged commit a880f38 into trunk Nov 8, 2023
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@jeryj jeryj deleted the a11y/mobile-viewport-sidebar-focus branch November 8, 2023 22:11
@github-actions github-actions bot added this to the Gutenberg 17.1 milestone Nov 8, 2023
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t-hamano commented Nov 9, 2023

Thanks for the review, @jeryj!

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t-hamano commented Nov 9, 2023

Thanks for the review, @jeryj!

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Labels
[Focus] Accessibility (a11y) Changes that impact accessibility and need corresponding review (e.g. markup changes). [Package] Edit Site /packages/edit-site [Type] Bug An existing feature does not function as intended
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Can access hidden sidebar via keyboard in site editor on small screens
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