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Components: Use aria-pressed attribute instead of the hard-coded is-pressed class #55004

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@t-hamano t-hamano commented Oct 3, 2023

Fixes: #55002
Related to #54740

What?

This PR uses the isPressed prop aria-pressed attribute instead in components that have manually assigned the is-pressed class.

This PR fixes two unintended pressed styles:

  • Block toolbar buttons for the search block
  • "More" dropdown button for inline formatting (#55002)
Before After
Block toolbar buttons for the search block search_before search_after
"More" dropdown button for inline formatting more_before more_after

Why?

In #54740, isPressed prop is now internally converted to the aria-pressed attribute. However, as fixed in this PR, isPressed prop or aria-pressed attribute may not be used and the is-pressed class is given directly.

In this case, the component will not be given the aria-pressed attribute; the selector for the .is-pressed class has been removed here, and the intended style will not be applied.

How?

Simply replaced with isPressed prop aria-pressed attribute.

Testing Instructions

  • Insert a Search block.
  • Activate "Toggle search label" and "Use button with icon" from the block toolbar.
  • The pressed styles should be applied correctly.
  • Apply one of the styles in the More dropdown menu to the text.
  • The pressed styles should be applied correctly.

Other concern

As in this case, there may be many consumers who directly grant the is-pressed class just to change its appearance. Reinstating the selector that was removed here would solve that, but would instead break the backward compatibility mentioned in #54740.

The only potential scope for issues is where a consumer has already set aria-pressed on a Button, but not isPressed, as this could affect the visual appearance due to the added is-pressed class.

I think we need to explore approaches to resolve these.

@t-hamano t-hamano self-assigned this Oct 3, 2023
@t-hamano t-hamano added [Type] Bug An existing feature does not function as intended [Package] Components /packages/components labels Oct 3, 2023
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github-actions bot commented Oct 3, 2023

Size Change: -5 B (0%)

Total Size: 1.62 MB

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@t-hamano t-hamano marked this pull request as ready for review October 3, 2023 12:13
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ciampo commented Oct 3, 2023

Could we use aria-pressed instead of the isPressed prop, since we're looking to deprecate it after we migrate all usages away from using it?

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github-actions bot commented Oct 3, 2023

Flaky tests detected in 9719b78.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/6392470457
📝 Reported issues:

@t-hamano t-hamano changed the title Components: Use isPressed prop instead of the hard-coded is-pressed class Components: Use aria-pressed attribute instead of the hard-coded is-pressed class Oct 3, 2023
@ciampo ciampo added Backport to Gutenberg RC Pull request that needs to be backported to a Gutenberg release candidate (RC) Backport to WP 6.7 Beta/RC Pull request that needs to be backported to the WordPress major release that's currently in beta [Package] Block editor /packages/block-editor and removed Backport to Gutenberg RC Pull request that needs to be backported to a Gutenberg release candidate (RC) [Package] Components /packages/components labels Oct 3, 2023
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ciampo commented Oct 3, 2023

In terms of semantics, aria-pressed refers to the pressed state of a toggle button. In this case, I'd argue that aria-selected is a better choice — although that won't trigger the "pressed" visual styles. (I'll let @andrewhayward confirm or invalidate my hypothesis)

A few options come to mind:

  1. make changes to Button so that the same pressed styles apply also when aria-selected="true" (this feels like the correct approach)
  2. make changes to Button so that the is-pressed selector is added back (this would be a hackier fix)

I'd probably be up for applying both fixes, since one doesn't exclude the other.

Finally, one last consideration: this is a typical example of why we discourage consumers of @wordpress/components from using internal classnames. As stated in the repository's docs, classnames are not part of components' public APIs.

@t-hamano
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t-hamano commented Oct 3, 2023

Thank you for your detailed opinion!

In terms of semantics, aria-pressed refers to the pressed state of a toggle button. In this case, I'd argue that aria-selected is a better choice — although that won't trigger the "pressed" visual styles. (I'll let @andrewhayward confirm or invalidate my hypothesis)

Regarding this PR, do you mean that aria-selected is more suitable than aria-pressed?

In that case, when updating the isPressed prop in the future, does that mean we should replace it with either aria-pressed or aria-selected, depending on the semantic meaning of that component?

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In terms of semantics, aria-pressed refers to the pressed state of a toggle button. In this case, I'd argue that aria-selected is a better choice — although that won't trigger the "pressed" visual styles. (I'll let @andrewhayward confirm or invalidate my hypothesis)

Toggled menubar buttons with dark backgrounds

In this case, aria-pressed is the right choice. Both are semantically toggle buttons, and aria-selected doesn't apply to that role.

Dropdown menu toggle button with dark background

This one's a bit harder. There aren't any clear additional semantics at play, because it's mostly a visual indication that the underlying menu has something selected. But again, aria-pressed would be the more appropriate choice, as it's still a button, even though a pressed "More" button doesn't communicate much!

A few options come to mind:

  1. make changes to Button so that the same pressed styles apply also when aria-selected="true" (this feels like the correct approach)

For what it's worth, this was the case, but it broke other things, so it had to be reverted. If we go ahead with this, we'll need to proceed with caution!

  1. make changes to Button so that the is-pressed selector is added back (this would be a hackier fix)

Would be relatively straightforward to add .is-pressed to the current selector, though agreed, it's not great.


While we're talking semantics, the dropdown menu needs a bit of work. The toggle button should link to the menu with an aria-controls, and most of the options should have a role="menuitemcheckbox". Not really in the scope of this patch, I appreciate!

Dropdown menu showing list of styling options

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In that case, when updating the isPressed prop in the future, does that mean we should replace it with either aria-pressed or aria-selected, depending on the semantic meaning of that component?

Yes, we should be using the correct attribute for the context. That might also be aria-checked too, depending on what the button's doing.

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ciampo commented Oct 3, 2023

Thank you @andrewhayward for the feedback!

So I guess the immediate next step is to put back the is-pressed classname in the Button component (https://github.com/WordPress/gutenberg/pull/54740/files/de18565d6b8a0096a50207614c576a17c237ba1f#r1344015301).

As follow-ups, we could:

  • for the dropdownmenu, we should probably wait until the new DropdownMenu is ready to be used. That component will assign aria-expanded="true" to the trigger button, which we can probably use to assign the same "pressed" visual state (when inside a toolbar)
  • continue to refactor components away from using the is-pressed classname
  • review usages of aria-selected and aria-checked and understand the best course of action

What do y'all think?


While we're talking semantics, the dropdown menu needs a bit of work. The toggle button should link to the menu with an aria-controls, and most of the options should have a role="menuitemcheckbox". Not really in the scope of this patch, I appreciate!

That's good feedback for my work on the next version of DropdownMenu, thank you!

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@t-hamano
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t-hamano commented Oct 4, 2023

So I guess the immediate next step is to put back the is-pressed classname in the Button component (https://github.com/WordPress/gutenberg/pull/54740/files/de18565d6b8a0096a50207614c576a17c237ba1f#r1344015301).

As follow-ups, we could:

  • for the dropdownmenu, we should probably wait until the new DropdownMenu is ready to be used. That component will assign aria-expanded="true" to the trigger button, which we can probably use to assign the same "pressed" visual state (when inside a toolbar)
  • continue to refactor components away from using the is-pressed classname
  • review usages of aria-selected and aria-checked and understand the best course of action

Yes, I also agree with this approach 👍

@ciampo
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ciampo commented Oct 4, 2023

Cool! I guess we can close this PR and open a new one that adds the is-pressed classname back — @andrewhayward should be able to work on this.

@ciampo ciampo closed this Oct 4, 2023
@mikachan mikachan removed the Backport to WP 6.7 Beta/RC Pull request that needs to be backported to the WordPress major release that's currently in beta label Oct 4, 2023
@t-hamano t-hamano deleted the fix/is-pressed-classname branch November 26, 2023 10:28
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