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Fix region navigation in the site editor #46525

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merged 4 commits into from
Dec 15, 2022
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youknowriad
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closes #46509
Follow up to #44770

What?

When we introduced the browse mode layout, we inadvertently broke the aria regions navigation. The problem is that the InterfaceSkeleton component is not the top level component anymore.

How?

I think now the site editor shouldn't be using that component at all because it departed from its intended original design, that said, and since that component still handles the positioning of several elements for us (inserters, sidebar...), I'm keeping it for now but I'm moving the navigateRegions hook to the higher-level layout which should bring us back to how it used to work before the browse PR.

Notes:

  • While working on this, I noticed that the navigateRegion styles have so many "implementation" specific styles (edit-post, interface...), these styles should be generic and not refer to any of that. This is minor so I didn't touch it here.
  • I also noticed that when loading the site editor, nothing is "focused" (the body), so the region navigation doesn't work unless you focus something, I think this has always been the case but maybe we should try to improve the focus behavior separately in the site editor.

Testing Instructions

  • Load the site editor and tab
  • Hit the navigate region shortcuts ctrl + option + n to navigate between the different aria regions.

@youknowriad youknowriad added [Type] Bug An existing feature does not function as intended [Focus] Accessibility (a11y) Changes that impact accessibility and need corresponding review (e.g. markup changes). labels Dec 14, 2022
@youknowriad youknowriad self-assigned this Dec 14, 2022
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Size Change: -331 B (0%)

Total Size: 1.32 MB

Filename Size Change
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ℹ️ View Unchanged
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@Mamaduka Mamaduka left a comment

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The Site Editor changes test well for me. I also tested the post editor and couldn't spot any regressions.

It would be nice to get feedback from folks with more experience in a11y. cc @afercia, @alexstine

P.S. I noticed that when the "Editor top bar" region is focused in the site editor, it has a black background.

Screenshot

CleanShot 2022-12-14 at 13 37 40

@alexstine alexstine self-requested a review December 14, 2022 16:48
@afercia
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afercia commented Dec 15, 2022

Thanks ❤️ I'll try to have a look as soon as possible. I'm afraid it won't happen before Monday though.

@youknowriad
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@Mamaduka The issue was that the trick used to draw the borders in region navigation relied on using z-index: -1 in a "stacker" div. which means the background of the parent element would take over and hide the inner element.

In the last commit I simplify the region navigation styles by removing that stacker div (like it used to be I think) and using a pseudo element to add the borders.

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@youknowriad, the changes introduced by this PR #45369, right?

It might be a good idea to re-test for regressions. I can do that later today.

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Yes, in my tests the borders are always clear and visible but maybe I'm missing something :)

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@jorgefilipecosta jorgefilipecosta left a comment

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The landmark for the inspector on the site editor looks a little strange:
image

The landmark for the browse mode sidebar also appears cut:
image

Both these issues are probably something on my test instance.

If we are with the save/publish panel open on the site editor navigating the regions Ctrl + backtick closes the save panel. (already an issue in the trunk can be checked later).

On browse mode, I can only see a landmark for the browse mode sidebar. Should we also have one for the content preview?

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@jorgefilipecosta the z-index file was broken, I think that's why you didn't have the right styles.

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@jorgefilipecosta the z-index file was broken, I think that's why you didn't have the right styles.

That was it and now I see the two landmarks on browse mode.

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Things are working well 👍

@Mamaduka
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Thank you, Riad! The region stacker div removal looks great 👍

@youknowriad youknowriad merged commit c963b31 into trunk Dec 15, 2022
@youknowriad youknowriad deleted the fix/region-navigation branch December 15, 2022 14:15
@github-actions github-actions bot added this to the Gutenberg 14.9 milestone Dec 15, 2022
@afercia
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afercia commented Dec 27, 2022

Thanks for working on this. Sorry I didn't have time to test it earlier. Unfortunately, both the functionality and the focus style seem to not work well. Most importantly:

In the last commit I simplify the region navigation styles by removing that stacker div (like it used to be I think) and using a pseudo element to add the borders.

As mentioned in #45369 we can't use a CSS pseudo element. because the pseudo element scrolls together wit the content. To reproduce:

  • make sure you test with a post with some long content
  • scroll the page a few lines down
  • use the navigate region keyboard shortcut and focus the content region
  • observe the blue outline did scroll up and its bottom side is displayed in the middle of the page, screenshot:

Screenshot 2022-12-27 at 09 53 39

  • fully scroll the page to the bottom so that the content that was initially above the fold is now completely out of view
  • test again the navigate region focus style on the content region
  • observe there's no visible focus style (actually it's on the part of the content that is out of view)

Note that, potentially, this will happen on any navigable region that is scrollable. Noting that the CSS pseudo element approach was already proposed in #21717 and not recommended for the same reason. Also noting that long time ago the focus style was actually using a CSS pseudo element and we changed it because of the scrolling issue, see #8554

Therefore, we need to set the focus style on an actual HTML element and this element must meet two conditions. As noted in #45369

  • The element must have a stack level that is higher than the one of any other element within it.
  • The element must have a size. If it has a 0 width or height, the outline won't be visible.

For these reasons, I'd still recommend the approach based on the 'stacker div'. It does solve the x-index issue in a reliable way. It doesn't use a CSS pseudo element. It makes things more reliable. I wouldn't recommend a CSS-only approach because any change to the CSS could break the focus style. Keeping the 'stacker div' makes the NavigableRegion component responsible for the focus style (at least for the x-index). Not to mention that it's better testable. Worth also mentioning that in another PR I'm proposing to add visual regression tests for the focus style. The PR is currently waiting for a reliable workflow to be established. See #46210

There are a few other things that don't work (most notably the navigate region doesn't work in the Site editor browse mode). I'll try to detail in a new issue.

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[Focus] Accessibility (a11y) Changes that impact accessibility and need corresponding review (e.g. markup changes). [Type] Bug An existing feature does not function as intended
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The new site editor Browse Mode breaks ARIA landmark and navigateRegions
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