diff --git a/phpunit/class-wp-theme-json-test.php b/phpunit/class-wp-theme-json-test.php
index 5156d4e2abe78..929100620e94e 100644
--- a/phpunit/class-wp-theme-json-test.php
+++ b/phpunit/class-wp-theme-json-test.php
@@ -709,7 +709,7 @@ public function test_get_stylesheet_renders_enabled_protected_properties() {
 			)
 		);
 
-		$expected = ':where(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; }:where(.wp-site-blocks) > * { margin-block-start: 1em; margin-block-end: 0; }:where(.wp-site-blocks) > :first-child { margin-block-start: 0; }:where(.wp-site-blocks) > :last-child { margin-block-end: 0; }:root { --wp--style--block-gap: 1em; }.is-layout-flow  > :first-child{margin-block-start: 0;}.is-layout-flow  > :last-child{margin-block-end: 0;}.is-layout-flow  > *{margin-block-start: 1em;margin-block-end: 0;}.is-layout-constrained  > :first-child{margin-block-start: 0;}.is-layout-constrained  > :last-child{margin-block-end: 0;}.is-layout-constrained  > *{margin-block-start: 1em;margin-block-end: 0;}.is-layout-flex {gap: 1em;}.is-layout-grid {gap: 1em;}.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)){margin-left: auto !important;margin-right: auto !important;}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;}';
+		$expected = ':where(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; }:where(.wp-site-blocks) > * { margin-block-start: 1em; margin-block-end: 0; }:where(.wp-site-blocks) > :first-child { margin-block-start: 0; }:where(.wp-site-blocks) > :last-child { margin-block-end: 0; }:root { --wp--style--block-gap: 1em; }:root :where(.is-layout-flow) > :first-child{margin-block-start: 0;}:root :where(.is-layout-flow) > :last-child{margin-block-end: 0;}:root :where(.is-layout-flow) > *{margin-block-start: 1em;margin-block-end: 0;}:root :where(.is-layout-constrained) > :first-child{margin-block-start: 0;}:root :where(.is-layout-constrained) > :last-child{margin-block-end: 0;}:root :where(.is-layout-constrained) > *{margin-block-start: 1em;margin-block-end: 0;}:root :where(.is-layout-flex){gap: 1em;}:root :where(.is-layout-grid){gap: 1em;}.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)){margin-left: auto !important;margin-right: auto !important;}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;}';
 		$this->assertSameCSS( $expected, $theme_json->get_stylesheet() );
 		$this->assertSameCSS( $expected, $theme_json->get_stylesheet( array( 'styles' ) ) );
 	}
@@ -1126,7 +1126,7 @@ public function test_get_stylesheet_generates_layout_styles() {
 
 		// Results also include root site blocks styles.
 		$this->assertSameCSS(
-			':root { --wp--style--global--content-size: 640px;--wp--style--global--wide-size: 1200px; }:where(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; }:where(.wp-site-blocks) > * { margin-block-start: 1em; margin-block-end: 0; }:where(.wp-site-blocks) > :first-child { margin-block-start: 0; }:where(.wp-site-blocks) > :last-child { margin-block-end: 0; }:root { --wp--style--block-gap: 1em; }.is-layout-flow  > :first-child{margin-block-start: 0;}.is-layout-flow  > :last-child{margin-block-end: 0;}.is-layout-flow  > *{margin-block-start: 1em;margin-block-end: 0;}.is-layout-constrained  > :first-child{margin-block-start: 0;}.is-layout-constrained  > :last-child{margin-block-end: 0;}.is-layout-constrained  > *{margin-block-start: 1em;margin-block-end: 0;}.is-layout-flex {gap: 1em;}.is-layout-grid {gap: 1em;}.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 { --wp--style--global--content-size: 640px;--wp--style--global--wide-size: 1200px; }:where(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; }:where(.wp-site-blocks) > * { margin-block-start: 1em; margin-block-end: 0; }:where(.wp-site-blocks) > :first-child { margin-block-start: 0; }:where(.wp-site-blocks) > :last-child { margin-block-end: 0; }:root { --wp--style--block-gap: 1em; }:root :where(.is-layout-flow) > :first-child{margin-block-start: 0;}:root :where(.is-layout-flow) > :last-child{margin-block-end: 0;}:root :where(.is-layout-flow) > *{margin-block-start: 1em;margin-block-end: 0;}:root :where(.is-layout-constrained) > :first-child{margin-block-start: 0;}:root :where(.is-layout-constrained) > :last-child{margin-block-end: 0;}:root :where(.is-layout-constrained) > *{margin-block-start: 1em;margin-block-end: 0;}:root :where(.is-layout-flex){gap: 1em;}:root :where(.is-layout-grid){gap: 1em;}.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;}',
 			$theme_json->get_stylesheet( array( 'styles' ) )
 		);
 	}
@@ -1155,7 +1155,7 @@ public function test_get_stylesheet_generates_layout_styles_with_spacing_presets
 
 		// Results also include root site blocks styles.
 		$this->assertSameCSS(
-			':root { --wp--style--global--content-size: 640px;--wp--style--global--wide-size: 1200px; }:where(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; }:where(.wp-site-blocks) > * { margin-block-start: var(--wp--preset--spacing--60); margin-block-end: 0; }:where(.wp-site-blocks) > :first-child { margin-block-start: 0; }:where(.wp-site-blocks) > :last-child { margin-block-end: 0; }:root { --wp--style--block-gap: var(--wp--preset--spacing--60); }.is-layout-flow  > :first-child{margin-block-start: 0;}.is-layout-flow  > :last-child{margin-block-end: 0;}.is-layout-flow  > *{margin-block-start: var(--wp--preset--spacing--60);margin-block-end: 0;}.is-layout-constrained  > :first-child{margin-block-start: 0;}.is-layout-constrained  > :last-child{margin-block-end: 0;}.is-layout-constrained  > *{margin-block-start: var(--wp--preset--spacing--60);margin-block-end: 0;}.is-layout-flex {gap: var(--wp--preset--spacing--60);}.is-layout-grid {gap: var(--wp--preset--spacing--60);}.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 { --wp--style--global--content-size: 640px;--wp--style--global--wide-size: 1200px; }:where(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; }:where(.wp-site-blocks) > * { margin-block-start: var(--wp--preset--spacing--60); margin-block-end: 0; }:where(.wp-site-blocks) > :first-child { margin-block-start: 0; }:where(.wp-site-blocks) > :last-child { margin-block-end: 0; }:root { --wp--style--block-gap: var(--wp--preset--spacing--60); }:root :where(.is-layout-flow) > :first-child{margin-block-start: 0;}:root :where(.is-layout-flow) > :last-child{margin-block-end: 0;}:root :where(.is-layout-flow) > *{margin-block-start: var(--wp--preset--spacing--60);margin-block-end: 0;}:root :where(.is-layout-constrained) > :first-child{margin-block-start: 0;}:root :where(.is-layout-constrained) > :last-child{margin-block-end: 0;}:root :where(.is-layout-constrained) > *{margin-block-start: var(--wp--preset--spacing--60);margin-block-end: 0;}:root :where(.is-layout-flex){gap: var(--wp--preset--spacing--60);}:root :where(.is-layout-grid){gap: var(--wp--preset--spacing--60);}.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;}',
 			$theme_json->get_stylesheet( array( 'styles' ) )
 		);
 	}
@@ -1279,8 +1279,7 @@ public function test_get_stylesheet_generates_valid_block_gap_values_and_skips_n
 		);
 
 		$this->assertSameCSS(
-			':root { --wp--style--global--content-size: 640px;--wp--style--global--wide-size: 1200px; }:where(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; }:where(.wp-site-blocks) > * { margin-block-start: 1rem; margin-block-end: 0; }:where(.wp-site-blocks) > :first-child { margin-block-start: 0; }:where(.wp-site-blocks) > :last-child { margin-block-end: 0; }:root { --wp--style--block-gap: 1rem; }.is-layout-flow  > :first-child{margin-block-start: 0;}.is-layout-flow  > :last-child{margin-block-end: 0;}.is-layout-flow  > *{margin-block-start: 1rem;margin-block-end: 0;}.is-layout-constrained  > :first-child{margin-block-start: 0;}.is-layout-constrained  > :last-child{margin-block-end: 0;}.is-layout-constrained  > *{margin-block-start: 1rem;margin-block-end: 0;}.is-layout-flex {gap: 1rem;}.is-layout-grid {gap: 1rem;}.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(.wp-block-post-content){color: gray;}.wp-block-social-links-is-layout-flow  > :first-child{margin-block-start: 0;}.wp-block-social-links-is-layout-flow  > :last-child{margin-block-end: 0;}.wp-block-social-links-is-layout-flow  > *{margin-block-start: 0;margin-block-end: 0;}.wp-block-social-links-is-layout-constrained  > :first-child{margin-block-start: 0;}.wp-block-social-links-is-layout-constrained  > :last-child{margin-block-end: 0;}.wp-block-social-links-is-layout-constrained  > *{margin-block-start: 0;margin-block-end: 0;}.wp-block-social-links-is-layout-flex {gap: 0;}.wp-block-social-links-is-layout-grid {gap: 0;}.wp-block-buttons-is-layout-flow  > :first-child{margin-block-start: 0;}.wp-block-buttons-is-layout-flow  > :last-child{margin-block-end: 0;}.wp-block-buttons-is-layout-flow  > *{margin-block-start: 0;margin-block-end: 0;}.wp-block-buttons-is-layout-constrained  > :first-child{margin-block-start: 0;}.wp-block-buttons-is-layout-constrained  > :last-child{margin-block-end: 0;}.wp-block-buttons-is-layout-constrained  > *{margin-block-start: 0;margin-block-end: 0;}.wp-block-buttons-is-layout-flex {gap: 0;}.wp-block-buttons-is-layout-grid {gap: 0;}',
+			':root { --wp--style--global--content-size: 640px;--wp--style--global--wide-size: 1200px; }:where(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; }:where(.wp-site-blocks) > * { margin-block-start: 1rem; margin-block-end: 0; }:where(.wp-site-blocks) > :first-child { margin-block-start: 0; }:where(.wp-site-blocks) > :last-child { margin-block-end: 0; }:root { --wp--style--block-gap: 1rem; }:root :where(.is-layout-flow) > :first-child{margin-block-start: 0;}:root :where(.is-layout-flow) > :last-child{margin-block-end: 0;}:root :where(.is-layout-flow) > *{margin-block-start: 1rem;margin-block-end: 0;}:root :where(.is-layout-constrained) > :first-child{margin-block-start: 0;}:root :where(.is-layout-constrained) > :last-child{margin-block-end: 0;}:root :where(.is-layout-constrained) > *{margin-block-start: 1rem;margin-block-end: 0;}:root :where(.is-layout-flex){gap: 1rem;}:root :where(.is-layout-grid){gap: 1rem;}.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(.wp-block-post-content){color: gray;}:root :where(.wp-block-social-links-is-layout-flow) > :first-child{margin-block-start: 0;}:root :where(.wp-block-social-links-is-layout-flow) > :last-child{margin-block-end: 0;}:root :where(.wp-block-social-links-is-layout-flow) > *{margin-block-start: 0;margin-block-end: 0;}:root :where(.wp-block-social-links-is-layout-constrained) > :first-child{margin-block-start: 0;}:root :where(.wp-block-social-links-is-layout-constrained) > :last-child{margin-block-end: 0;}:root :where(.wp-block-social-links-is-layout-constrained) > *{margin-block-start: 0;margin-block-end: 0;}:root :where(.wp-block-social-links-is-layout-flex){gap: 0;}:root :where(.wp-block-social-links-is-layout-grid){gap: 0;}:root :where(.wp-block-buttons-is-layout-flow) > :first-child{margin-block-start: 0;}:root :where(.wp-block-buttons-is-layout-flow) > :last-child{margin-block-end: 0;}:root :where(.wp-block-buttons-is-layout-flow) > *{margin-block-start: 0;margin-block-end: 0;}:root :where(.wp-block-buttons-is-layout-constrained) > :first-child{margin-block-start: 0;}:root :where(.wp-block-buttons-is-layout-constrained) > :last-child{margin-block-end: 0;}:root :where(.wp-block-buttons-is-layout-constrained) > *{margin-block-start: 0;margin-block-end: 0;}:root :where(.wp-block-buttons-is-layout-flex){gap: 0;}:root :where(.wp-block-buttons-is-layout-grid){gap: 0;}',
 			$theme_json->get_stylesheet()
 		);
 	}
@@ -3685,7 +3684,7 @@ public function test_get_styles_with_appearance_tools() {
 			'selector' => 'body',
 		);
 
-		$expected = ':where(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; }:where(.wp-site-blocks) > * { margin-block-start: ; margin-block-end: 0; }:where(.wp-site-blocks) > :first-child { margin-block-start: 0; }:where(.wp-site-blocks) > :last-child { margin-block-end: 0; }:root { --wp--style--block-gap: ; }.is-layout-flow  > :first-child{margin-block-start: 0;}.is-layout-flow  > :last-child{margin-block-end: 0;}.is-layout-flow  > *{margin-block-start: 1;margin-block-end: 0;}.is-layout-constrained  > :first-child{margin-block-start: 0;}.is-layout-constrained  > :last-child{margin-block-end: 0;}.is-layout-constrained  > *{margin-block-start: 1;margin-block-end: 0;}.is-layout-flex {gap: 1;}.is-layout-grid {gap: 1;}.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)){margin-left: auto !important;margin-right: auto !important;}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;}';
+		$expected = ':where(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; }:where(.wp-site-blocks) > * { margin-block-start: ; margin-block-end: 0; }:where(.wp-site-blocks) > :first-child { margin-block-start: 0; }:where(.wp-site-blocks) > :last-child { margin-block-end: 0; }:root { --wp--style--block-gap: ; }:root :where(.is-layout-flow) > :first-child{margin-block-start: 0;}:root :where(.is-layout-flow) > :last-child{margin-block-end: 0;}:root :where(.is-layout-flow) > *{margin-block-start: 1;margin-block-end: 0;}:root :where(.is-layout-constrained) > :first-child{margin-block-start: 0;}:root :where(.is-layout-constrained) > :last-child{margin-block-end: 0;}:root :where(.is-layout-constrained) > *{margin-block-start: 1;margin-block-end: 0;}:root :where(.is-layout-flex){gap: 1;}:root :where(.is-layout-grid){gap: 1;}.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)){margin-left: auto !important;margin-right: auto !important;}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;}';
 		$this->assertSameCSS( $expected, $theme_json->get_root_layout_rules( WP_Theme_JSON_Gutenberg::ROOT_BLOCK_SELECTOR, $metadata ) );
 	}