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Try reducing specificity of global styles selectors only. #60106

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merged 2 commits into from
Mar 26, 2024

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tellthemachines
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What?

Split out from #57841. This part handles only the global styles selectors: block, element and feature level. The layout selectors will follow in another PR, but I think, from my local testing, that this change works pretty well by itself.

Testing Instructions

  1. Add global styles to all the blocks and check that they are applied as expected in both the editor and the front end.

Testing Instructions for Keyboard

Screenshots or screencast

@tellthemachines tellthemachines added [Type] Enhancement A suggestion for improvement. Global Styles Anything related to the broader Global Styles efforts, including Styles Engine and theme.json CSS Styling Related to editor and front end styles, CSS-specific issues. labels Mar 22, 2024
@tellthemachines tellthemachines self-assigned this Mar 22, 2024
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github-actions bot commented Mar 22, 2024

Size Change: +45 B (0%)

Total Size: 1.72 MB

Filename Size Change
build/block-editor/index.min.js 253 kB +45 B (0%)
ℹ️ View Unchanged
Filename Size
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Flaky tests detected in fb490fb.
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/8386140666
📝 Reported issues:

@MaggieCabrera
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On a first quick glance this is looking good on my testing. Are we planning on changing specificity to the block's CSS or is that something we want to keep as is? I'm looking at the block's stylesheets to see what could be overriding theme styling via theme.json and I don't find much, so it might not be a big deal. I'll come back with more testing.

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@MaggieCabrera
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On a first quick glance this is looking good on my testing. Are we planning on changing specificity to the block's CSS or is that something we want to keep as is? I'm looking at the block's stylesheets to see what could be overriding theme styling via theme.json and I don't find much, so it might not be a big deal. I'll come back with more testing.

Ok, delving deeper into the blocks' stylesheets I see that we have already covered our based in terms of what can be overrideable via GS. We need to think that in the future some of the things that can't be styled via GS will be and we will need to go back to the blocks' styles to ensure that specificity war is being won, but that shouldn't block this PR. Maybe we need to document that somewhere.

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There are some weird :where nesting when we have some elements inside blocks on theme.json. The final output seems to be working fine and the specificity is 0 like expected, but the CSS is a bit ugly I suppose. Not a blocker but I guess worth commenting.

The case in my example on TT4 would be:

"core/post-title": {
	"elements": {
		"link": {
			"typography": {
				"textDecoration": "none"
			}
		}
	}
},

Turning into:

:where(.wp-block-post-title a:where(:not(.wp-element-button))) {
  text-decoration: none;
}

Where in trunk it's just:

.wp-block-post-title a:where(:not(.wp-element-button)) {
  text-decoration: none;
}

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Thanks for reviewing and testing @MaggieCabrera !

There are some weird :where nesting when we have some elements inside blocks on theme.json. The final output seems to be working fine and the specificity is 0 like expected, but the CSS is a bit ugly I suppose.

I ended up not removing the :where from the element selector after this conversation on the other PR. We could still try it, but given the current selector works, it might be better to tackle that separately as a follow-up in order to avoid blocking this PR 😅

Are we planning on changing specificity to the block's CSS or is that something we want to keep as is?

It would be good to ensure minimal specificity for all block-library styles as that's the general direction we've been heading in for a few years now. Again, that could be done as a follow-up.

Also, as has already been commented in #57841, CSS cascade layers could be a great candidate for solving this problem in one go, but an exploration is needed to see if it's actually a viable solution for us right now. In the meantime, reducing global styles specificity is the main blocker for the extension of block style variations, so we're proceeding down this safer route for now.

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Thanks for continuing to split up and work through #57841 👍

It looks like we're missing the :where around global styles for blocks that use custom feature-level selectors e.g Image block and borders.

The required change is in the original PR and works when applied here. Once applied though the unit tests for the useGlobalStylesOutput hook will need updating as per #57841 too.

Screenshot 2024-03-25 at 1 05 42 PM

I've mostly tested via the site editor's style book so far and from that side most blocks are working as expected.

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It looks like we're missing the :where around global styles for blocks that use custom feature-level selectors e.g Image block and borders.

Well spotted! Updated now. Thanks for reviewing!

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Sorry I missed some of the comments on the original PR! yeah, none of my comments are blockers, it seems like you've covered all the bases

@aaronrobertshaw aaronrobertshaw force-pushed the try/global-styles-only-specificity branch from bbedcfb to d2b2b91 Compare March 26, 2024 06:17
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I've rebased this one to resolve the conflicts with the theme.json unit tests after the recent switch from body to :root for custom CSS properties (#42084).

Following that I've also given this another smoke test and it's testing well for me. Using the site editor's style book, all the global styles I tweaked were applied to the block. Those styles were also then reflected on the frontend still.

The prior issue with the feature selectors has been resolved as well.

Screenshot 2024-03-26 at 4 12 57 PM

I think this is in reasonable shape so I'll give it a tentative approval. Given the broad nature of the changes, it might pay to get an extra set of eyes from @MaggieCabrera before hitting merge.

@@ -244,12 +244,12 @@ function Iframe( {
height: auto !important;
min-height: 100%;
}

body {
/* Lowest specificity to not override global styles */
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Can confirm that this doesn't break the zoomed-out mode 👍

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This is looking good to me too, let's bring this in!

@tellthemachines tellthemachines merged commit e408f73 into trunk Mar 26, 2024
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Awesome, thanks for reviewing folks!

@github-actions github-actions bot added this to the Gutenberg 18.1 milestone Mar 26, 2024
@tellthemachines tellthemachines added Needs Dev Note Requires a developer note for a major WordPress release cycle Needs PHP backport Needs PHP backport to Core labels Mar 27, 2024
carstingaxion pushed a commit to carstingaxion/gutenberg that referenced this pull request Mar 27, 2024
…60106)

Co-authored-by: tellthemachines <[email protected]>
Co-authored-by: MaggieCabrera <[email protected]>
Co-authored-by: aaronrobertshaw <[email protected]>
cbravobernal pushed a commit to garridinsi/gutenberg that referenced this pull request Apr 9, 2024
…60106)

Co-authored-by: tellthemachines <[email protected]>
Co-authored-by: MaggieCabrera <[email protected]>
Co-authored-by: aaronrobertshaw <[email protected]>
@juanmaguitar juanmaguitar mentioned this pull request May 29, 2024
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CSS Styling Related to editor and front end styles, CSS-specific issues. Global Styles Anything related to the broader Global Styles efforts, including Styles Engine and theme.json Needs Dev Note Requires a developer note for a major WordPress release cycle Needs PHP backport Needs PHP backport to Core [Type] Enhancement A suggestion for improvement.
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3 participants