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Global styles: output :root selector for CSS custom properties #42084

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merged 5 commits into from
Mar 26, 2024
Merged

Global styles: output :root selector for CSS custom properties #42084

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54bc3e7
Replacing usages of body with :root for generated CSS properties, pre…
ramonjd Apr 5, 2023
1660e5e
Update tests after rebase
ramonjd Mar 18, 2024
184ca75
Using :root for CSS custom properties in the site editor and for duot…
ramonjd Mar 18, 2024
50a3a05
Revert mistaken selector swap - reverted to body
ramonjd Mar 18, 2024
8389580
Use const for root selector
ramonjd Mar 19, 2024
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2 changes: 1 addition & 1 deletion lib/class-wp-duotone-gutenberg.php
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Original file line number Diff line number Diff line change
Expand Up @@ -623,7 +623,7 @@ private static function get_svg_definitions( $sources ) {
* @return string The CSS for global styles.
*/
private static function get_global_styles_presets( $sources ) {
$css = 'body{';
$css = WP_Theme_JSON_Gutenberg::ROOT_CSS_PROPERTIES_SELECTOR . '{';
foreach ( $sources as $filter_id => $filter_data ) {
$slug = $filter_data['slug'];
$colors = $filter_data['colors'];
Expand Down
39 changes: 23 additions & 16 deletions lib/class-wp-theme-json-gutenberg.php
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Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,14 @@ class WP_Theme_JSON_Gutenberg {
*/
protected static $blocks_metadata = array();

/**
* The CSS selector for the top-level preset settings.
*
* @since 6.6.0
* @var string
*/
const ROOT_CSS_PROPERTIES_SELECTOR = ':root';

/**
* The CSS selector for the top-level styles.
*
Expand Down Expand Up @@ -1751,7 +1759,7 @@ static function ( $carry, $element ) {
* @return string The result of processing the presets.
*/
protected static function compute_preset_classes( $settings, $selector, $origins ) {
if ( static::ROOT_BLOCK_SELECTOR === $selector ) {
if ( static::ROOT_BLOCK_SELECTOR === $selector || static::ROOT_CSS_PROPERTIES_SELECTOR === $selector ) {
// Classes at the global level do not need any CSS prefixed,
// and we don't want to increase its specificity.
$selector = '';
Expand Down Expand Up @@ -2276,7 +2284,7 @@ protected static function get_setting_nodes( $theme_json, $selectors = array() )
// Top-level.
$nodes[] = array(
'path' => array( 'settings' ),
'selector' => static::ROOT_BLOCK_SELECTOR,
'selector' => static::ROOT_CSS_PROPERTIES_SELECTOR,
);

// Calculate paths for blocks.
Expand Down Expand Up @@ -2673,6 +2681,7 @@ static function ( $pseudo_selector ) use ( $selector ) {
* Outputs the CSS for layout rules on the root.
*
* @since 6.1.0
* @since 6.6.0 Use `ROOT_CSS_PROPERTIES_SELECTOR` for CSS custom properties.
*
* @param string $selector The root node selector.
* @param array $block_metadata The metadata for the root block.
Expand All @@ -2683,16 +2692,6 @@ public function get_root_layout_rules( $selector, $block_metadata ) {
$settings = $this->theme_json['settings'] ?? array();
$use_root_padding = isset( $this->theme_json['settings']['useRootPaddingAwareAlignments'] ) && true === $this->theme_json['settings']['useRootPaddingAwareAlignments'];

/*
* Reset default browser margin on the root body element.
* This is set on the root selector **before** generating the ruleset
* from the `theme.json`. This is to ensure that if the `theme.json` declares
* `margin` in its `spacing` declaration for the `body` element then these
* user-generated values take precedence in the CSS cascade.
* @link https://github.com/WordPress/gutenberg/issues/36147.
*/
$css .= 'body { margin: 0;';

/*
* If there are content and wide widths in theme.json, output them
* as custom properties on the body element so all blocks can use them.
Expand All @@ -2702,11 +2701,19 @@ public function get_root_layout_rules( $selector, $block_metadata ) {
$content_size = static::is_safe_css_declaration( 'max-width', $content_size ) ? $content_size : 'initial';
$wide_size = isset( $settings['layout']['wideSize'] ) ? $settings['layout']['wideSize'] : $settings['layout']['contentSize'];
$wide_size = static::is_safe_css_declaration( 'max-width', $wide_size ) ? $wide_size : 'initial';
$css .= '--wp--style--global--content-size: ' . $content_size . ';';
$css .= '--wp--style--global--wide-size: ' . $wide_size . ';';
$css .= static::ROOT_CSS_PROPERTIES_SELECTOR . ' { --wp--style--global--content-size: ' . $content_size . ';';
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@ramonjd ramonjd Mar 19, 2024 •
edited
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One thing I've been playing with locally is moving the $use_root_padding logic from compute_style_properties to get_root_layout_rules.

This entails:

  • deleting the --wp--root--padding-* entries from PROPERTIES_METADATA
  • in compute_style_properties, skipping padding properties for the root block if the theme has opted into using the root padding, and removing all other padding related logic
  • building the rules in get_root_layout_rules.

I haven't even considered backwards compat yet 😄

Here's a diff to illustrate what I mean: 
diff --git a/lib/class-wp-theme-json-gutenberg.php b/lib/class-wp-theme-json-gutenberg.php
index e3c27ac82c..48b2493fe2 100644
--- a/lib/class-wp-theme-json-gutenberg.php
+++ b/lib/class-wp-theme-json-gutenberg.php
@@ -266,11 +266,6 @@ class WP_Theme_JSON_Gutenberg {
 		'padding-right'                     => array( 'spacing', 'padding', 'right' ),
 		'padding-bottom'                    => array( 'spacing', 'padding', 'bottom' ),
 		'padding-left'                      => array( 'spacing', 'padding', 'left' ),
-		'--wp--style--root--padding'        => array( 'spacing', 'padding' ),
-		'--wp--style--root--padding-top'    => array( 'spacing', 'padding', 'top' ),
-		'--wp--style--root--padding-right'  => array( 'spacing', 'padding', 'right' ),
-		'--wp--style--root--padding-bottom' => array( 'spacing', 'padding', 'bottom' ),
-		'--wp--style--root--padding-left'   => array( 'spacing', 'padding', 'left' ),
 		'text-decoration'                   => array( 'typography', 'textDecoration' ),
 		'text-transform'                    => array( 'typography', 'textTransform' ),
 		'filter'                            => array( 'filter', 'duotone' ),
@@ -2092,6 +2087,7 @@ class WP_Theme_JSON_Gutenberg {
 	 * @since 5.9.0 Added the `$settings` and `$properties` parameters.
 	 * @since 6.1.0 Added `$theme_json`, `$selector`, and `$use_root_padding` parameters.
 	 * @since 6.5.0 Passing current theme JSON settings to wp_get_typography_font_size_value().
+	 * @since 6.6.0 Root padding CSS custom properties are processed in get_root_layout_rules().
 	 *
 	 * @param array   $styles Styles to process.
 	 * @param array   $settings Theme settings.
@@ -2111,28 +2107,18 @@ class WP_Theme_JSON_Gutenberg {
 			return $declarations;
 		}
 
-		$root_variable_duplicates = array();
-
 		foreach ( $properties as $css_property => $value_path ) {
 			$value = static::get_property_value( $styles, $value_path, $theme_json );
 
-			if ( str_starts_with( $css_property, '--wp--style--root--' ) && ( static::ROOT_BLOCK_SELECTOR !== $selector || ! $use_root_padding ) ) {
-				continue;
-			}
-			// Root-level padding styles don't currently support strings with CSS shorthand values.
-			// This may change: https://github.com/WordPress/gutenberg/issues/40132.
-			if ( '--wp--style--root--padding' === $css_property && is_string( $value ) ) {
-				continue;
-			}
-
-			if ( str_starts_with( $css_property, '--wp--style--root--' ) && $use_root_padding ) {
-				$root_variable_duplicates[] = substr( $css_property, strlen( '--wp--style--root--' ) );
-			}
-
-			// Look up protected properties, keyed by value path.
-			// Skip protected properties that are explicitly set to `null`.
 			if ( is_array( $value_path ) ) {
 				$path_string = implode( '.', $value_path );
+				// Skip padding properties for the root block if the theme has opted into using the root padding.
+				// The CSS custom properties for root padding are processed in get_root_layout_rules() and use static::ROOT_CSS_PROPERTIES_SELECTOR selector.
+				if ( static::ROOT_BLOCK_SELECTOR === $selector && $use_root_padding && str_starts_with( $path_string, 'spacing.padding.' ) ) {
+					continue;
+				}
+				// Look up protected properties, keyed by value path.
+				// Skip protected properties that are explicitly set to `null`.
 				if (
 					isset( static::PROTECTED_PROPERTIES[ $path_string ] ) &&
 					_wp_array_get( $settings, static::PROTECTED_PROPERTIES[ $path_string ], null ) === null
@@ -2181,14 +2167,6 @@ class WP_Theme_JSON_Gutenberg {
 			);
 		}
 
-		// If a variable value is added to the root, the corresponding property should be removed.
-		foreach ( $root_variable_duplicates as $duplicate ) {
-			$discard = array_search( $duplicate, array_column( $declarations, 'name' ), true );
-			if ( is_numeric( $discard ) ) {
-				array_splice( $declarations, $discard, 1 );
-			}
-		}
-
 		return $declarations;
 	}
 
@@ -2688,9 +2666,10 @@ class WP_Theme_JSON_Gutenberg {
 	 * @return string The additional root rules CSS.
 	 */
 	public function get_root_layout_rules( $selector, $block_metadata ) {
-		$css              = '';
-		$settings         = $this->theme_json['settings'] ?? array();
-		$use_root_padding = isset( $this->theme_json['settings']['useRootPaddingAwareAlignments'] ) && true === $this->theme_json['settings']['useRootPaddingAwareAlignments'];
+		$css               = '';
+		$settings          = $this->theme_json['settings'] ?? array();
+		$use_root_padding  = isset( $this->theme_json['settings']['useRootPaddingAwareAlignments'] ) && true === $this->theme_json['settings']['useRootPaddingAwareAlignments'];
+		$root_declarations = array();
 
 		/*
 		* If there are content and wide widths in theme.json, output them
@@ -2701,8 +2680,37 @@ class WP_Theme_JSON_Gutenberg {
 			$content_size = static::is_safe_css_declaration( 'max-width', $content_size ) ? $content_size : 'initial';
 			$wide_size    = isset( $settings['layout']['wideSize'] ) ? $settings['layout']['wideSize'] : $settings['layout']['contentSize'];
 			$wide_size    = static::is_safe_css_declaration( 'max-width', $wide_size ) ? $wide_size : 'initial';
-			$css         .= static::ROOT_CSS_PROPERTIES_SELECTOR . ' { --wp--style--global--content-size: ' . $content_size . ';';
-			$css         .= '--wp--style--global--wide-size: ' . $wide_size . '; }';
+			$root_declarations[] = array(
+				'name'  => '--wp--style--global--content-size',
+				'value' => $content_size,
+			);
+			$root_declarations[] = array(
+				'name'  => '--wp--style--global--wide-size',
+				'value' => $wide_size,
+			);
+		}
+
+		if ( $use_root_padding ) {
+			$root_padding = array(
+				'--wp--style--root--padding-top'    => static::get_property_value( $this->theme_json, array( 'styles', 'spacing', 'padding', 'top' ) ),
+				'--wp--style--root--padding-right'  => static::get_property_value( $this->theme_json, array( 'styles', 'spacing', 'padding', 'right' ) ),
+				'--wp--style--root--padding-bottom' => static::get_property_value( $this->theme_json, array( 'styles', 'spacing', 'padding', 'bottom' ) ),
+				'--wp--style--root--padding-left'   => static::get_property_value( $this->theme_json, array( 'styles', 'spacing', 'padding', 'left' ) ),
+			);
+
+			$root_padding = array_filter( $root_padding, 'strlen' );
+			if ( ! empty( $root_padding ) ) {
+				foreach ( $root_padding as $property => $value ) {
+					$root_declarations[] = array(
+						'name'  => $property,
+						'value' => $value,
+					);
+				}
+			}
+		}
+
+		if ( ! empty( $root_declarations ) ) {
+			$css .= static::to_ruleset( static::ROOT_CSS_PROPERTIES_SELECTOR, $root_declarations );
 		}
 
 		/*

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I think we should do the above, but maybe in another PR, especially if we have to test for backwards compat.

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Follow-up PR sounds like a good idea 👍

$css .= '--wp--style--global--wide-size: ' . $wide_size . '; }';
}

$css .= ' }';
/*
* Reset default browser margin on the body element.
* This is set on the body selector **before** generating the ruleset
* from the `theme.json`. This is to ensure that if the `theme.json` declares
* `margin` in its `spacing` declaration for the `body` element then these
* user-generated values take precedence in the CSS cascade.
* @link https://github.com/WordPress/gutenberg/issues/36147.
*/
$css .= 'body { margin: 0; }';

if ( $use_root_padding ) {
// Top and bottom padding are applied to the outer block container.
Expand Down Expand Up @@ -2738,7 +2745,7 @@ public function get_root_layout_rules( $selector, $block_metadata ) {
$css .= ':where(.wp-site-blocks) > :last-child:last-child { margin-block-end: 0; }';

// For backwards compatibility, ensure the legacy block gap CSS variable is still available.
$css .= "$selector { --wp--style--block-gap: $block_gap_value; }";
$css .= static::ROOT_CSS_PROPERTIES_SELECTOR . " { --wp--style--block-gap: $block_gap_value; }";
}
$css .= $this->get_layout_styles( $block_metadata );

Expand Down
12 changes: 6 additions & 6 deletions packages/block-editor/src/components/global-styles/test/use-global-styles-output.js
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,7 @@ import {
getStylesDeclarations,
processCSSNesting,
} from '../use-global-styles-output';
import { ROOT_BLOCK_SELECTOR } from '../utils';
import { ROOT_BLOCK_SELECTOR, ROOT_CSS_PROPERTIES_SELECTOR } from '../utils';

describe( 'global styles renderer', () => {
describe( 'getNodesWithStyles', () => {
Expand Down Expand Up @@ -254,7 +254,7 @@ describe( 'global styles renderer', () => {
],
},
},
selector: ROOT_BLOCK_SELECTOR,
selector: ROOT_CSS_PROPERTIES_SELECTOR,
},
{
presets: {
Expand Down Expand Up @@ -342,7 +342,7 @@ describe( 'global styles renderer', () => {
};

expect( toCustomProperties( tree, blockSelectors ) ).toEqual(
'body{--wp--preset--color--white: white;--wp--preset--color--black: black;--wp--preset--color--white-2-black: value;--wp--custom--white-2-black: value;--wp--custom--font-primary: value;--wp--custom--line-height--body: 1.7;--wp--custom--line-height--heading: 1.3;}h1,h2,h3,h4,h5,h6{--wp--preset--font-size--small: 12px;--wp--preset--font-size--medium: 23px;}'
':root{--wp--preset--color--white: white;--wp--preset--color--black: black;--wp--preset--color--white-2-black: value;--wp--custom--white-2-black: value;--wp--custom--font-primary: value;--wp--custom--line-height--body: 1.7;--wp--custom--line-height--heading: 1.3;}h1,h2,h3,h4,h5,h6{--wp--preset--font-size--small: 12px;--wp--preset--font-size--medium: 23px;}'
);
} );
} );
Expand Down Expand Up @@ -614,7 +614,7 @@ describe( 'global styles renderer', () => {
},
};
expect( toStyles( Object.freeze( tree ), 'body' ) ).toEqual(
'body {margin: 0; --wp--style--global--content-size: 840px; --wp--style--global--wide-size: 1100px;}.wp-site-blocks > .alignleft { float: left; margin-right: 2em; }.wp-site-blocks > .alignright { float: right; margin-left: 2em; }.wp-site-blocks > .aligncenter { justify-content: center; margin-left: auto; margin-right: auto; }'
':root { --wp--style--global--content-size: 840px; --wp--style--global--wide-size: 1100px;}body {margin: 0;}.wp-site-blocks > .alignleft { float: left; margin-right: 2em; }.wp-site-blocks > .alignright { float: right; margin-left: 2em; }.wp-site-blocks > .aligncenter { justify-content: center; margin-left: auto; margin-right: auto; }'
);
} );
} );
Expand Down Expand Up @@ -734,7 +734,7 @@ describe( 'global styles renderer', () => {
} );

expect( layoutStyles ).toEqual(
':where(body .is-layout-flow) > * { margin-block-start: 0; margin-block-end: 0; }:where(body .is-layout-flow) > * + * { margin-block-start: 0.5em; margin-block-end: 0; }:where(body .is-layout-flex) { gap: 0.5em; }body { --wp--style--block-gap: 0.5em; }body .is-layout-flow > .alignleft { float: left; margin-inline-start: 0; margin-inline-end: 2em; }body .is-layout-flow > .alignright { float: right; margin-inline-start: 2em; margin-inline-end: 0; }body .is-layout-flow > .aligncenter { margin-left: auto !important; margin-right: auto !important; }body .is-layout-flex { display:flex; }body .is-layout-flex { flex-wrap: wrap; align-items: center; }body .is-layout-flex > * { margin: 0; }'
':where(body .is-layout-flow) > * { margin-block-start: 0; margin-block-end: 0; }:where(body .is-layout-flow) > * + * { margin-block-start: 0.5em; margin-block-end: 0; }:where(body .is-layout-flex) { gap: 0.5em; }:root { --wp--style--block-gap: 0.5em; }body .is-layout-flow > .alignleft { float: left; margin-inline-start: 0; margin-inline-end: 2em; }body .is-layout-flow > .alignright { float: right; margin-inline-start: 2em; margin-inline-end: 0; }body .is-layout-flow > .aligncenter { margin-left: auto !important; margin-right: auto !important; }body .is-layout-flex { display:flex; }body .is-layout-flex { flex-wrap: wrap; align-items: center; }body .is-layout-flex > * { margin: 0; }'
);
} );

Expand All @@ -751,7 +751,7 @@ describe( 'global styles renderer', () => {
} );

expect( layoutStyles ).toEqual(
':where(body .is-layout-flow) > * { margin-block-start: 0; margin-block-end: 0; }:where(body .is-layout-flow) > * + * { margin-block-start: 12px; margin-block-end: 0; }:where(body .is-layout-flex) { gap: 12px; }body { --wp--style--block-gap: 12px; }body .is-layout-flow > .alignleft { float: left; margin-inline-start: 0; margin-inline-end: 2em; }body .is-layout-flow > .alignright { float: right; margin-inline-start: 2em; margin-inline-end: 0; }body .is-layout-flow > .aligncenter { margin-left: auto !important; margin-right: auto !important; }body .is-layout-flex { display:flex; }body .is-layout-flex { flex-wrap: wrap; align-items: center; }body .is-layout-flex > * { margin: 0; }'
':where(body .is-layout-flow) > * { margin-block-start: 0; margin-block-end: 0; }:where(body .is-layout-flow) > * + * { margin-block-start: 12px; margin-block-end: 0; }:where(body .is-layout-flex) { gap: 12px; }:root { --wp--style--block-gap: 12px; }body .is-layout-flow > .alignleft { float: left; margin-inline-start: 0; margin-inline-end: 2em; }body .is-layout-flow > .alignright { float: right; margin-inline-start: 2em; margin-inline-end: 0; }body .is-layout-flow > .aligncenter { margin-left: auto !important; margin-right: auto !important; }body .is-layout-flex { display:flex; }body .is-layout-flex { flex-wrap: wrap; align-items: center; }body .is-layout-flex > * { margin: 0; }'
);
} );

Expand Down
37 changes: 23 additions & 14 deletions packages/block-editor/src/components/global-styles/use-global-styles-output.js
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,7 @@ import { privateApis as componentsPrivateApis } from '@wordpress/components';
import {
PRESET_METADATA,
ROOT_BLOCK_SELECTOR,
ROOT_CSS_PROPERTIES_SELECTOR,
scopeSelector,
appendToSelector,
getBlockStyleVariationSelector,
Expand Down Expand Up @@ -543,7 +544,7 @@ export function getLayoutStyles( {
);
// For backwards compatibility, ensure the legacy block gap CSS variable is still available.
if ( selector === ROOT_BLOCK_SELECTOR && hasBlockGapSupport ) {
ruleset += `${ selector } { --wp--style--block-gap: ${ gapValue }; }`;
ruleset += `${ ROOT_CSS_PROPERTIES_SELECTOR } { --wp--style--block-gap: ${ gapValue }; }`;
}
}

Expand Down Expand Up @@ -729,7 +730,7 @@ export const getNodesWithSettings = ( tree, blockSelectors ) => {
nodes.push( {
presets,
custom,
selector: ROOT_BLOCK_SELECTOR,
selector: ROOT_CSS_PROPERTIES_SELECTOR,
} );
}

Expand Down Expand Up @@ -781,24 +782,28 @@ export const toStyles = (
const nodesWithSettings = getNodesWithSettings( tree, blockSelectors );
const useRootPaddingAlign = tree?.settings?.useRootPaddingAwareAlignments;
const { contentSize, wideSize } = tree?.settings?.layout || {};
let ruleset = '';

if ( contentSize || wideSize ) {
ruleset += `${ ROOT_CSS_PROPERTIES_SELECTOR } {`;
ruleset = contentSize
? ruleset + ` --wp--style--global--content-size: ${ contentSize };`
: ruleset;
ruleset = wideSize
? ruleset + ` --wp--style--global--wide-size: ${ wideSize };`
: ruleset;
ruleset += '}';
}

/*
* Reset default browser margin on the root body element.
* This is set on the root selector **before** generating the ruleset
* Reset default browser margin on the body element.
* This is set on the body selector **before** generating the ruleset
* from the `theme.json`. This is to ensure that if the `theme.json` declares
* `margin` in its `spacing` declaration for the `body` element then these
* user-generated values take precedence in the CSS cascade.
* @link https://github.com/WordPress/gutenberg/issues/36147.
*/
let ruleset = 'body {margin: 0;';

if ( contentSize ) {
ruleset += ` --wp--style--global--content-size: ${ contentSize };`;
}

if ( wideSize ) {
ruleset += ` --wp--style--global--wide-size: ${ wideSize };`;
}
ruleset += 'body {margin: 0;';

// Root padding styles should only be output for full templates, not patterns or template parts.
if ( useRootPaddingAlign && isTemplate ) {
Expand Down Expand Up @@ -1000,7 +1005,10 @@ export const toStyles = (
}

nodesWithSettings.forEach( ( { selector, presets } ) => {
if ( ROOT_BLOCK_SELECTOR === selector ) {
if (
ROOT_BLOCK_SELECTOR === selector ||
ROOT_CSS_PROPERTIES_SELECTOR === selector
) {
// Do not add extra specificity for top-level classes.
selector = '';
}
Expand Down Expand Up @@ -1211,6 +1219,7 @@ export function useGlobalStylesOutputWithConfig( mergedConfig = {} ) {
updatedConfig,
blockSelectors
);

const globalStyles = toStyles(
updatedConfig,
blockSelectors,
Expand Down
1 change: 1 addition & 0 deletions packages/block-editor/src/components/global-styles/utils.js
View file
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@ import { getValueFromObjectPath } from '../../utils/object';

/* Supporting data. */
export const ROOT_BLOCK_SELECTOR = 'body';
export const ROOT_CSS_PROPERTIES_SELECTOR = ':root';

export const PRESET_METADATA = [
{
Expand Down
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