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Layout: Try removing body element from base layout rules #42518

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andrewserong
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What?

🚧 🚧 🚧 🚧 WIP: This is an exploration at the moment 🚧 🚧 🚧 🚧

Part of #39336 and following on from a suggestion in https://github.com/WordPress/gutenberg/pull/40875/files#discussion_r914497178.

This PR removes body from the base layout rules such as .is-layout-flow and .is-layout-flex.

Why?

The premise is that we only need to prefix the Layout rules with the selector when the selector is for a particular block, the base layout rules only need to be attached to the Layout type's classname — specifying the Layout rules as being a descendant of body is unnecessary.

How?

Update the Layout rules to remove the selector from the rule construction when the selector is the root block selector.

Testing Instructions

  1. Add a Group block with a couple of children, and a Buttons or Social Icons block with a couple of children to a post or page.
  2. Ensure the Layout styles for these blocks render correctly in the editor and on the front end of a site.
  3. Add these blocks to the Site editor, and ensure within the site editor the Layout styles render correctly. Save.
  4. On the site front end, ensure these blocks added in the Site editor also render correctly.

Screenshots or screencast

@andrewserong andrewserong added [Type] Code Quality Issues or PRs that relate to code quality Global Styles Anything related to the broader Global Styles efforts, including Styles Engine and theme.json labels Jul 19, 2022
@andrewserong andrewserong self-assigned this Jul 19, 2022
@andrewserong
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In testing, I actually think we probably need the body rule in place, otherwise rules that exist as part of the block's base CSS takes precedence.

For example, in this branch, the Column block's bottom margin takes precedence, where we actually want the base layout's gap rule to take effect:

trunk this branch
image image

@tellthemachines just pinging you since you'd brought up exploring removing the body prefix on the base Layout styles during review of #40875. From this testing, I think it might be better for us to preserve the body rule prefix for now for these base styles, so that the blockGap behaves consistently. Still, I'm glad I explored this PR as it makes it a little clearer some of the nuances surrounding specificity here.

Let me know if you think it's still worth pursuing, otherwise I think I might close out this exploration for now.

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Size Change: -1 B (0%)

Total Size: 1.26 MB

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@tellthemachines
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Thanks for trying this out!

From this testing, I think it might be better for us to preserve the body rule prefix for now for these base styles, so that the blockGap behaves consistently.

Yeah, looks like we might have to do so. Would that margin on the Columns block be necessary for block themes, or only for classic themes I wonder? Perhaps at some point we could work out what styles we no longer need for block themes and serve them only if a classic theme is detected?

In any case, yes, I think we can shelve this for now as it doesn't look like it's immediately doable!

@andrewserong
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Thanks for taking a look!

Perhaps at some point we could work out what styles we no longer need for block themes and serve them only if a classic theme is detected?

Yes, I think there's more intuitive work we can do surrounding this. In my mind, ideally, if we're using layout spacing everywhere in blocks-based themes, individual blocks shouldn't be providing their own margins. It'd be good to come back to that kind of idea once layouts have progressed a bit further.

I'll close this one out. Thanks again!

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