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Storybook: Add global CSS switcher #42747

Merged
merged 3 commits into from Jul 28, 2022
Merged

Storybook: Add global CSS switcher #42747

merged 3 commits into from Jul 28, 2022

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mirka
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@mirka mirka commented Jul 27, 2022

Closes #42717
Fixes #42414

What?

Implements a global CSS switcher add-on so we can test our component styles in different CSS environments.

Why?

Recently we've made some unexpected discoveries (#37555, #42414, #42415) about the CSS contexts that wp-components exist in. I was also bitten by this when working on #42000, when I wrote CSS for a component that looked good in Storybook but completely broke down when rendered in wp-admin, due to some broadly scoped styles in a globally loaded WP stylesheet.

We need to ensure that our components have sufficient styles to work in a non-WP context. At the same time, we need to ensure that components have styles that are defensive enough to hold up in a (sometimes adverse) WP context.

The purpose of this Storybook add-on is to help us easily switch between WP and non-WP CSS environments.

How?

First of all, we fix the style leakage issue in the Block Editor Playground. The reset.css that is meant for the Playground will now only be loaded in the Playground story.

Then, we implement a Storybook add-on where we can configure some presets to load and unload CSS files dynamically. I've set up three presets to begin with: none, basic, and wordpress. We can tweak these as we discover new surprises or our testing needs change.

Testing Instructions

  1. npm run storybook:dev
  2. Pick a story (e.g. FontSizePicker) and try switching between CSS presets.
  3. Inspect an input element for example, and see how styles from forms.css is affecting it when choosing the WordPress preset.

Screenshots or screencast

CleanShot.2022-07-28.at.01.08.22.mp4

@mirka mirka added [Feature] UI Components Storybook Storybook and its stories for components labels Jul 27, 2022
@mirka mirka added this to In progress (owned) ⏳ in WordPress Components via automation Jul 27, 2022
@mirka mirka self-assigned this Jul 27, 2022
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@github-actions github-actions bot commented Jul 27, 2022

Size Change: +625 B (0%)

Total Size: 1.26 MB

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

Thanks for putting this together @mirka 👍

This tests as advertised for me. I tried several components within the Storybook and all appeared to get the correct styles when switching between the presets.

I did notice with the BorderBoxControl that it was missing a box-sizing reset as discussed within #42415.

I'm not certain exactly what you had in mind for a boxSizingReset mixin but I've knocked up a PR (#42754) based off this branch that adds one and fixes the BorderBoxControl. Happy to abandon it though if I've gone down the wrong track.

storybook/global-wordpress.lazy.scss Outdated Show resolved Hide resolved
'https://wordpress.org/gutenberg/wp-admin/css/common.min.css',
'https://wordpress.org/gutenberg/wp-admin/css/forms.min.css',
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@ciampo ciampo Jul 28, 2022

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Do you think that we may end up in an "out-of-sync" situation between the version of the styles hosted on wordpress.org and the styles that part of a given PR ?

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@mirka mirka Jul 28, 2022

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And we could be in trouble either way since components need to work with all versions of WP 😂

I don't expect there to be frequent changes to the kind of broadly scoped styles that are affecting us, but if we do encounter issues we could consider the Trac or GitHub-hosted mirror as a source.

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@ciampo ciampo Jul 28, 2022

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Fair point 😅 Let's keep it as it is, and make changes if necessary

Co-authored-by: Aaron Robertshaw <60436221+aaronrobertshaw@users.noreply.github.com>
@mirka mirka merged commit b17ee9e into trunk Jul 28, 2022
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WordPress Components automation moved this from In progress (owned) ⏳ to Done 🎉 Jul 28, 2022
@mirka mirka deleted the storybook/css-loading branch Jul 28, 2022
@github-actions github-actions bot added this to the Gutenberg 13.9 milestone Jul 28, 2022
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