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Fix specificity issue between theme and user styles #29533

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merged 4 commits into from
Mar 4, 2021

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Fixes #29381

How to test

  • Use a theme with support for FSE (templates) and Global Style (theme.json), such as TT1-blocks.
  • Via theme.json target the post title for color styles by adding:
"core/post-title/h2": {
    "color": {
        "text": "green",
        "background": "yellow"
    }
}
  • Go to the editor, add three post title blocks:
    • Select text & background preset colors (not custom) for the first.
    • Select text & background custom colors (not preset) for the second.
    • Leave the third untouched.
  • Publish the post and go to the front end.

The expected behavior would be that the user choices are respected, both in the editor and front-end.

@oandregal oandregal requested a review from spacedmonkey as a code owner March 3, 2021 18:57
@oandregal oandregal self-assigned this Mar 3, 2021
@oandregal oandregal added [Type] Bug An existing feature does not function as intended Global Styles Anything related to the broader Global Styles efforts, including Styles Engine and theme.json labels Mar 3, 2021
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Size Change: +194 B (0%)

Total Size: 1.39 MB

Filename Size Change
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ℹ️ View Unchanged
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@oandregal oandregal force-pushed the fix/specificity-user-styles branch from 31d613b to e5a92b6 Compare March 4, 2021 10:27
Given how the style system works, !important is a good choice
for preset classes the user attaches to the post content.
If those values need to be overridden, in addition to regular CSS,
we can offer hooks for the theme.json processing,
so plugins have an alternate mechanism to modify this behavior.
@oandregal oandregal force-pushed the fix/specificity-user-styles branch from e5a92b6 to 980a0b6 Compare March 4, 2021 10:27
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@youknowriad youknowriad left a comment

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Makes sense to me, but other opinions would be good too.

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@aristath aristath left a comment

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LGTM 👍
I'm sure lots of people will say that !important is evil, but sometimes it's the best tool for the job.

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OK, I think I'm going to land this so we can get better feedback ― this is something that's easily reversible so we can course-correct later, if necessary.

@oandregal oandregal merged commit f302ab1 into trunk Mar 4, 2021
@oandregal oandregal deleted the fix/specificity-user-styles branch March 4, 2021 12:16
@github-actions github-actions bot added this to the Gutenberg 10.2 milestone Mar 4, 2021
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Wanted to share #29985 (comment) for all that follow this PR.

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Hi guys,

I'm very late to the party, but the issue with !important in recent WP5.9 led me here.
I have to voice one of my worries, that I can see being very real reading your comments here (but is not related to !important).

From your conversation above:

@youknowriad : I'm saying that because I don't believe relying on has-text-color and similar classes is a good thing, it adds an indirect dependency to something the block might or might not apply. (the block supports should be seen as just a shortcut for block authors and not something mandatory when using presets...)

@oandregal : Ah, I see your point now: it's about the fact that has-text-color classes are only added by core's UI controls and not necessarily by any other custom UI controls.

There may be potentially a big issue with Gutenberg not applying "BEMish" naming on modifier CSS classes. Although it uses BEM for block classes (such as .wp-block-button.wp-block-button__link), it fails with modifier classes such as .has-red-color (I will use a text color modifier class as an example in here, but the issue applies for all modifier classes).

It is especially impossible to target .has-red-color, .has-black-color and .has-white-color classes at once for any batch styling without targeting a helper .has-text-color class. If .has-text-color class is not something a theme (and plugins) can rely on, then we have a problem.

If Gutenberg used BEMish naming for modifier classes such as .has-<PROPERTY>--<VALUE>, we would get .has-color--red or .has-font-size--small and theme authors could target these with [class*="has-<PROPERTY>--"] selectors. There would be no need for helper classes such as .has-text-color then.

Also, there is no way for theme authors to know about potential redundancy of .has-text-color class and I'd say it is used quite often in the wild. That's why theme authors rely on it (and similar classes).

It seems like there is no documentation for Gutenberg best practices and standards so even extension plugins can follow these to make the ecosystem more consistent. (→ could be of an interest for @annezazu re dev focused communication site)

It's also confusing that colors have a helper class (.has-text-color, .has-background and .has-background-gradient), but font size does not, for example.

But like I've mentioned, this issue could be resolved with more modular naming of CSS classes.

Do you think it is worth to log a new issue ticket for this problem?

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Hey Oliver. Sure, if there's an issue with how current classes work that merits an independent conversation.

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Hi André,

There is actually no issue currently with the classes.
Just reading your comments here brings up concerns about class naming and helper class redundancy.

I will open a new issue for discussion. Thanks.

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Hi Oliver, if there's no current issue but you still want to share your thoughts on something, I believe https://github.com/WordPress/gutenberg/discussions would be a better place as it helps keep Gutenberg issues for triaging actual product bugs/features/etc.

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Thanks for pointing me in the right direction.

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Presets selected by the user are not applied to the Post Title block
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