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Fix root selector specificity cherry pick to 6.6 #63737

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Aug 8, 2024
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Fix root selector specificity cherry pick to 6.6 #63737

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3 changes: 3 additions & 0 deletions backport-changelog/6.6/7061.md
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@@ -0,0 +1,3 @@
https://github.com/WordPress/wordpress-develop/pull/7061

* https://github.com/WordPress/gutenberg/pull/63726
15 changes: 10 additions & 5 deletions lib/class-wp-theme-json-gutenberg.php
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Expand Up @@ -2847,18 +2847,23 @@ static function ( $pseudo_selector ) use ( $selector ) {
}

/*
* Root selector (body) styles should not be wrapped in `:root where()` to keep
* specificity at (0,0,1) and maintain backwards compatibility.
*
* Top-level element styles using element-only specificity selectors should
* not get wrapped in `:root :where()` to maintain backwards compatibility.
*
* Pseudo classes, e.g. :hover, :focus etc., are a class-level selector so
* still need to be wrapped in `:root :where` to cap specificity for nested
* variations etc. Pseudo selectors won't match the ELEMENTS selector exactly.
*/
$element_only_selector = $current_element &&
isset( static::ELEMENTS[ $current_element ] ) &&
// buttons, captions etc. still need `:root :where()` as they are class based selectors.
! isset( static::__EXPERIMENTAL_ELEMENT_CLASS_NAMES[ $current_element ] ) &&
static::ELEMENTS[ $current_element ] === $selector;
$element_only_selector = $is_root_selector || (
$current_element &&
isset( static::ELEMENTS[ $current_element ] ) &&
// buttons, captions etc. still need `:root :where()` as they are class based selectors.
! isset( static::__EXPERIMENTAL_ELEMENT_CLASS_NAMES[ $current_element ] ) &&
static::ELEMENTS[ $current_element ] === $selector
);

// 2. Generate and append the rules that use the general selector.
$general_selector = $element_only_selector ? $selector : ":root :where($selector)";
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3 changes: 2 additions & 1 deletion packages/block-editor/src/components/global-styles/test/use-global-styles-output.js
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Expand Up @@ -107,6 +107,7 @@ describe( 'global styles renderer', () => {
},
},
selector: ROOT_BLOCK_SELECTOR,
skipSelectorWrapper: true,
},
{
styles: {
Expand Down Expand Up @@ -481,7 +482,7 @@ describe( 'global styles renderer', () => {
};

expect( toStyles( tree, blockSelectors ) ).toEqual(
':where(body) {margin: 0;}.is-layout-flow > .alignleft { float: left; margin-inline-start: 0; margin-inline-end: 2em; }.is-layout-flow > .alignright { float: right; margin-inline-start: 2em; margin-inline-end: 0; }.is-layout-flow > .aligncenter { margin-left: auto !important; margin-right: auto !important; }.is-layout-constrained > .alignleft { float: left; margin-inline-start: 0; margin-inline-end: 2em; }.is-layout-constrained > .alignright { float: right; margin-inline-start: 2em; margin-inline-end: 0; }.is-layout-constrained > .aligncenter { margin-left: auto !important; margin-right: auto !important; }.is-layout-constrained > :where(:not(.alignleft):not(.alignright):not(.alignfull)) { max-width: var(--wp--style--global--content-size); margin-left: auto !important; margin-right: auto !important; }.is-layout-constrained > .alignwide { max-width: var(--wp--style--global--wide-size); }body .is-layout-flex { display:flex; }.is-layout-flex { flex-wrap: wrap; align-items: center; }.is-layout-flex > :is(*, div) { margin: 0; }body .is-layout-grid { display:grid; }.is-layout-grid > :is(*, div) { margin: 0; }:root :where(body){background-color: red;margin: 10px;padding: 10px;}a:where(:not(.wp-element-button)){color: blue;}:root :where(a:where(:not(.wp-element-button)):hover){color: orange;}:root :where(a:where(:not(.wp-element-button)):focus){color: orange;}h1{font-size: 42px;}:root :where(.wp-block-group){margin-top: 10px;margin-right: 20px;margin-bottom: 30px;margin-left: 40px;padding-top: 11px;padding-right: 22px;padding-bottom: 33px;padding-left: 44px;}:root :where(h1,h2,h3,h4,h5,h6){color: orange;}:root :where(h1 a:where(:not(.wp-element-button)),h2 a:where(:not(.wp-element-button)),h3 a:where(:not(.wp-element-button)),h4 a:where(:not(.wp-element-button)),h5 a:where(:not(.wp-element-button)),h6 a:where(:not(.wp-element-button))){color: hotpink;}:root :where(h1 a:where(:not(.wp-element-button)):hover,h2 a:where(:not(.wp-element-button)):hover,h3 a:where(:not(.wp-element-button)):hover,h4 a:where(:not(.wp-element-button)):hover,h5 a:where(:not(.wp-element-button)):hover,h6 a:where(:not(.wp-element-button)):hover){color: red;}:root :where(h1 a:where(:not(.wp-element-button)):focus,h2 a:where(:not(.wp-element-button)):focus,h3 a:where(:not(.wp-element-button)):focus,h4 a:where(:not(.wp-element-button)):focus,h5 a:where(:not(.wp-element-button)):focus,h6 a:where(:not(.wp-element-button)):focus){color: red;}:root :where(.wp-block-image img, .wp-block-image .wp-crop-area){border-radius: 9999px;}:root :where(.wp-block-image){color: red;}.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; }.has-white-color{color: var(--wp--preset--color--white) !important;}.has-white-background-color{background-color: var(--wp--preset--color--white) !important;}.has-white-border-color{border-color: var(--wp--preset--color--white) !important;}.has-black-color{color: var(--wp--preset--color--black) !important;}.has-black-background-color{background-color: var(--wp--preset--color--black) !important;}.has-black-border-color{border-color: var(--wp--preset--color--black) !important;}h1.has-blue-color,h2.has-blue-color,h3.has-blue-color,h4.has-blue-color,h5.has-blue-color,h6.has-blue-color{color: var(--wp--preset--color--blue) !important;}h1.has-blue-background-color,h2.has-blue-background-color,h3.has-blue-background-color,h4.has-blue-background-color,h5.has-blue-background-color,h6.has-blue-background-color{background-color: var(--wp--preset--color--blue) !important;}h1.has-blue-border-color,h2.has-blue-border-color,h3.has-blue-border-color,h4.has-blue-border-color,h5.has-blue-border-color,h6.has-blue-border-color{border-color: var(--wp--preset--color--blue) !important;}'
':where(body) {margin: 0;}.is-layout-flow > .alignleft { float: left; margin-inline-start: 0; margin-inline-end: 2em; }.is-layout-flow > .alignright { float: right; margin-inline-start: 2em; margin-inline-end: 0; }.is-layout-flow > .aligncenter { margin-left: auto !important; margin-right: auto !important; }.is-layout-constrained > .alignleft { float: left; margin-inline-start: 0; margin-inline-end: 2em; }.is-layout-constrained > .alignright { float: right; margin-inline-start: 2em; margin-inline-end: 0; }.is-layout-constrained > .aligncenter { margin-left: auto !important; margin-right: auto !important; }.is-layout-constrained > :where(:not(.alignleft):not(.alignright):not(.alignfull)) { max-width: var(--wp--style--global--content-size); margin-left: auto !important; margin-right: auto !important; }.is-layout-constrained > .alignwide { max-width: var(--wp--style--global--wide-size); }body .is-layout-flex { display:flex; }.is-layout-flex { flex-wrap: wrap; align-items: center; }.is-layout-flex > :is(*, div) { margin: 0; }body .is-layout-grid { display:grid; }.is-layout-grid > :is(*, div) { margin: 0; }body{background-color: red;margin: 10px;padding: 10px;}a:where(:not(.wp-element-button)){color: blue;}:root :where(a:where(:not(.wp-element-button)):hover){color: orange;}:root :where(a:where(:not(.wp-element-button)):focus){color: orange;}h1{font-size: 42px;}:root :where(.wp-block-group){margin-top: 10px;margin-right: 20px;margin-bottom: 30px;margin-left: 40px;padding-top: 11px;padding-right: 22px;padding-bottom: 33px;padding-left: 44px;}:root :where(h1,h2,h3,h4,h5,h6){color: orange;}:root :where(h1 a:where(:not(.wp-element-button)),h2 a:where(:not(.wp-element-button)),h3 a:where(:not(.wp-element-button)),h4 a:where(:not(.wp-element-button)),h5 a:where(:not(.wp-element-button)),h6 a:where(:not(.wp-element-button))){color: hotpink;}:root :where(h1 a:where(:not(.wp-element-button)):hover,h2 a:where(:not(.wp-element-button)):hover,h3 a:where(:not(.wp-element-button)):hover,h4 a:where(:not(.wp-element-button)):hover,h5 a:where(:not(.wp-element-button)):hover,h6 a:where(:not(.wp-element-button)):hover){color: red;}:root :where(h1 a:where(:not(.wp-element-button)):focus,h2 a:where(:not(.wp-element-button)):focus,h3 a:where(:not(.wp-element-button)):focus,h4 a:where(:not(.wp-element-button)):focus,h5 a:where(:not(.wp-element-button)):focus,h6 a:where(:not(.wp-element-button)):focus){color: red;}:root :where(.wp-block-image img, .wp-block-image .wp-crop-area){border-radius: 9999px;}:root :where(.wp-block-image){color: red;}.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; }.has-white-color{color: var(--wp--preset--color--white) !important;}.has-white-background-color{background-color: var(--wp--preset--color--white) !important;}.has-white-border-color{border-color: var(--wp--preset--color--white) !important;}.has-black-color{color: var(--wp--preset--color--black) !important;}.has-black-background-color{background-color: var(--wp--preset--color--black) !important;}.has-black-border-color{border-color: var(--wp--preset--color--black) !important;}h1.has-blue-color,h2.has-blue-color,h3.has-blue-color,h4.has-blue-color,h5.has-blue-color,h6.has-blue-color{color: var(--wp--preset--color--blue) !important;}h1.has-blue-background-color,h2.has-blue-background-color,h3.has-blue-background-color,h4.has-blue-background-color,h5.has-blue-background-color,h6.has-blue-background-color{background-color: var(--wp--preset--color--blue) !important;}h1.has-blue-border-color,h2.has-blue-border-color,h3.has-blue-border-color,h4.has-blue-border-color,h5.has-blue-border-color,h6.has-blue-border-color{border-color: var(--wp--preset--color--blue) !important;}'
);
} );

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3 changes: 3 additions & 0 deletions packages/block-editor/src/components/global-styles/use-global-styles-output.js
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Expand Up @@ -634,6 +634,9 @@ export const getNodesWithStyles = ( tree, blockSelectors ) => {
nodes.push( {
styles,
selector: ROOT_BLOCK_SELECTOR,
// Root selector (body) styles should not be wrapped in `:root where()` to keep
// specificity at (0,0,1) and maintain backwards compatibility.
skipSelectorWrapper: true,
} );
}

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