first commit

wp-includes/blocks/footnotes/block.json

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+{
+	"$schema": "https://schemas.wp.org/trunk/block.json",
+	"apiVersion": 3,
+	"name": "core/footnotes",
+	"title": "Footnotes",
+	"category": "text",
+	"description": "Display footnotes added to the page.",
+	"keywords": [ "references" ],
+	"textdomain": "default",
+	"usesContext": [ "postId", "postType" ],
+	"supports": {
+		"anchor": true,
+		"__experimentalBorder": {
+			"radius": true,
+			"color": true,
+			"width": true,
+			"style": true,
+			"__experimentalDefaultControls": {
+				"radius": false,
+				"color": false,
+				"width": false,
+				"style": false
+			}
+		},
+		"color": {
+			"background": true,
+			"link": true,
+			"text": true,
+			"__experimentalDefaultControls": {
+				"link": true,
+				"text": true
+			}
+		},
+		"html": false,
+		"multiple": false,
+		"reusable": false,
+		"inserter": false,
+		"spacing": {
+			"margin": true,
+			"padding": true,
+			"__experimentalDefaultControls": {
+				"margin": false,
+				"padding": false
+			}
+		},
+		"typography": {
+			"fontSize": true,
+			"lineHeight": true,
+			"__experimentalFontFamily": true,
+			"__experimentalTextDecoration": true,
+			"__experimentalFontStyle": true,
+			"__experimentalFontWeight": true,
+			"__experimentalLetterSpacing": true,
+			"__experimentalTextTransform": true,
+			"__experimentalWritingMode": true,
+			"__experimentalDefaultControls": {
+				"fontSize": true
+			}
+		},
+		"interactivity": {
+			"clientNavigation": true
+		}
+	},
+	"style": "wp-block-footnotes"
+}

wp-includes/blocks/footnotes/style-rtl.css

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+.editor-styles-wrapper,
+.entry-content {
+  counter-reset: footnotes;
+}
+
+a[data-fn].fn {
+  vertical-align: super;
+  font-size: smaller;
+  counter-increment: footnotes;
+  display: inline-flex;
+  text-decoration: none;
+  text-indent: -9999999px;
+}
+
+a[data-fn].fn::after {
+  content: "[" counter(footnotes) "]";
+  text-indent: 0;
+  float: right;
+}

wp-includes/blocks/footnotes/style-rtl.min.css

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+.editor-styles-wrapper,.entry-content{counter-reset:footnotes}a[data-fn].fn{counter-increment:footnotes;display:inline-flex;font-size:smaller;text-decoration:none;text-indent:-9999999px;vertical-align:super}a[data-fn].fn:after{content:"[" counter(footnotes) "]";float:right;text-indent:0}

wp-includes/blocks/footnotes/style.css

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+.editor-styles-wrapper,
+.entry-content {
+  counter-reset: footnotes;
+}
+
+a[data-fn].fn {
+  vertical-align: super;
+  font-size: smaller;
+  counter-increment: footnotes;
+  display: inline-flex;
+  text-decoration: none;
+  text-indent: -9999999px;
+}
+
+a[data-fn].fn::after {
+  content: "[" counter(footnotes) "]";
+  text-indent: 0;
+  float: left;
+}

wp-includes/blocks/footnotes/style.min.css

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+.editor-styles-wrapper,.entry-content{counter-reset:footnotes}a[data-fn].fn{counter-increment:footnotes;display:inline-flex;font-size:smaller;text-decoration:none;text-indent:-9999999px;vertical-align:super}a[data-fn].fn:after{content:"[" counter(footnotes) "]";float:left;text-indent:0}