diff --git a/packages/core/src/api/exporters/html/util/serializeBlocksExternalHTML.ts b/packages/core/src/api/exporters/html/util/serializeBlocksExternalHTML.ts
index 17ab49fe69..c458b292a2 100644
--- a/packages/core/src/api/exporters/html/util/serializeBlocksExternalHTML.ts
+++ b/packages/core/src/api/exporters/html/util/serializeBlocksExternalHTML.ts
@@ -170,6 +170,7 @@ function serializeBlock<
   serializer: DOMSerializer,
   orderedListItemBlockTypes: Set<string>,
   unorderedListItemBlockTypes: Set<string>,
+  nestingLevel: number,
   options?: { document?: Document },
 ) {
   const doc = options?.document ?? document;
@@ -236,9 +237,21 @@ function serializeBlock<
     }
 
     addAttributesAndRemoveClasses(ret.dom.firstChild! as HTMLElement);
+    if (nestingLevel > 0) {
+      (ret.dom.firstChild! as HTMLElement).setAttribute(
+        "data-nesting-level",
+        nestingLevel.toString(),
+      );
+    }
     elementFragment.append(...Array.from(ret.dom.childNodes));
   } else {
     elementFragment.append(ret.dom);
+    if (nestingLevel > 0) {
+      (ret.dom as HTMLElement).setAttribute(
+        "data-nesting-level",
+        nestingLevel.toString(),
+      );
+    }
   }
 
   if (ret.contentDOM && block.content) {
@@ -287,6 +300,7 @@ function serializeBlock<
       serializer,
       orderedListItemBlockTypes,
       unorderedListItemBlockTypes,
+      nestingLevel + 1,
       options,
     );
     if (
@@ -323,6 +337,7 @@ const serializeBlocksToFragment = <
   serializer: DOMSerializer,
   orderedListItemBlockTypes: Set<string>,
   unorderedListItemBlockTypes: Set<string>,
+  nestingLevel = 0,
   options?: { document?: Document },
 ) => {
   for (const block of blocks) {
@@ -333,6 +348,7 @@ const serializeBlocksToFragment = <
       serializer,
       orderedListItemBlockTypes,
       unorderedListItemBlockTypes,
+      nestingLevel,
       options,
     );
   }
@@ -360,6 +376,7 @@ export const serializeBlocksExternalHTML = <
     serializer,
     orderedListItemBlockTypes,
     unorderedListItemBlockTypes,
+    0,
     options,
   );
   return fragment;
diff --git a/packages/server-util/src/context/__snapshots__/ServerBlockNoteEditor.test.ts.snap b/packages/server-util/src/context/__snapshots__/ServerBlockNoteEditor.test.ts.snap
index 3179609ca8..129db1e87b 100644
--- a/packages/server-util/src/context/__snapshots__/ServerBlockNoteEditor.test.ts.snap
+++ b/packages/server-util/src/context/__snapshots__/ServerBlockNoteEditor.test.ts.snap
@@ -2,7 +2,7 @@
 
 exports[`Test ServerBlockNoteEditor > converts to HTML (blocksToFullHTML) 1`] = `"<div class="bn-block-group" data-node-type="blockGroup"><div class="bn-block-outer" data-node-type="blockOuter" data-id="1"><div class="bn-block" data-node-type="blockContainer" data-id="1"><div class="bn-block-content" data-content-type="heading" data-background-color="blue" data-text-color="yellow" data-text-alignment="right" data-level="2"><h2 class="bn-inline-content"><strong><u>Heading </u></strong><em><s>2</s></em></h2></div><div class="bn-block-group" data-node-type="blockGroup"><div class="bn-block-outer" data-node-type="blockOuter" data-id="2"><div class="bn-block" data-node-type="blockContainer" data-id="2"><div class="bn-block-content" data-content-type="paragraph" data-background-color="red"><p class="bn-inline-content">Paragraph</p></div></div></div><div class="bn-block-outer" data-node-type="blockOuter" data-id="3"><div class="bn-block" data-node-type="blockContainer" data-id="3"><div class="bn-block-content" data-content-type="bulletListItem"><p class="bn-inline-content">list item</p></div></div></div></div></div></div><div class="bn-block-outer" data-node-type="blockOuter" data-id="4"><div class="bn-block" data-node-type="blockContainer" data-id="4"><div class="bn-block-content" data-content-type="image" data-name="Example" data-url="exampleURL" data-caption="Caption" data-preview-width="256" data-file-block=""><div class="bn-file-block-content-wrapper" style="position: relative; width: 256px;"><div class="bn-visual-media-wrapper"><img class="bn-visual-media" src="exampleURL" alt="Example" draggable="false"></div><p class="bn-file-caption">Caption</p></div></div></div></div><div class="bn-block-outer" data-node-type="blockOuter" data-id="5"><div class="bn-block" data-node-type="blockContainer" data-id="5"><div class="bn-block-content" data-content-type="image" data-name="Example" data-url="exampleURL" data-caption="Caption" data-show-preview="false" data-preview-width="256" data-file-block=""><div class="bn-file-block-content-wrapper" style="position: relative;"><div class="bn-file-name-with-icon"><div class="bn-file-icon"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor"><path d="M3 8L9.00319 2H19.9978C20.5513 2 21 2.45531 21 2.9918V21.0082C21 21.556 20.5551 22 20.0066 22H3.9934C3.44476 22 3 21.5501 3 20.9932V8ZM10 4V9H5V20H19V4H10Z"></path></svg></div><p class="bn-file-name">Example</p></div><p class="bn-file-caption">Caption</p></div></div></div></div></div>"`;
 
-exports[`Test ServerBlockNoteEditor > converts to and from HTML (blocksToHTMLLossy) 1`] = `"<h2 style="background-color: rgb(221, 235, 241); color: rgb(223, 171, 1); text-align: right;" data-background-color="blue" data-text-color="yellow" data-text-alignment="right" data-level="2"><strong><u>Heading </u></strong><em><s>2</s></em></h2><p style="background-color: rgb(251, 228, 228);" data-background-color="red">Paragraph</p><ul><li><p class="bn-inline-content">list item</p></li></ul><figure data-name="Example" data-url="exampleURL" data-caption="Caption" data-preview-width="256"><img src="exampleURL" alt="Example" width="256"><figcaption>Caption</figcaption></figure><div data-name="Example" data-url="exampleURL" data-caption="Caption" data-show-preview="false" data-preview-width="256"><a href="exampleURL">Example</a><p>Caption</p></div>"`;
+exports[`Test ServerBlockNoteEditor > converts to and from HTML (blocksToHTMLLossy) 1`] = `"<h2 style="background-color: rgb(221, 235, 241); color: rgb(223, 171, 1); text-align: right;" data-background-color="blue" data-text-color="yellow" data-text-alignment="right" data-level="2"><strong><u>Heading </u></strong><em><s>2</s></em></h2><p style="background-color: rgb(251, 228, 228);" data-background-color="red" data-nesting-level="1">Paragraph</p><ul><li data-nesting-level="1"><p class="bn-inline-content">list item</p></li></ul><figure data-name="Example" data-url="exampleURL" data-caption="Caption" data-preview-width="256"><img src="exampleURL" alt="Example" width="256"><figcaption>Caption</figcaption></figure><div data-name="Example" data-url="exampleURL" data-caption="Caption" data-show-preview="false" data-preview-width="256"><a href="exampleURL">Example</a><p>Caption</p></div>"`;
 
 exports[`Test ServerBlockNoteEditor > converts to and from HTML (blocksToHTMLLossy) 2`] = `
 [
diff --git a/packages/xl-multi-column/package.json b/packages/xl-multi-column/package.json
index 15579bf945..3aee205292 100644
--- a/packages/xl-multi-column/package.json
+++ b/packages/xl-multi-column/package.json
@@ -64,9 +64,8 @@
   "devDependencies": {
     "@types/react": "^19.2.2",
     "@types/react-dom": "^19.2.2",
-    "@vitest/ui": "^2.1.9",
     "eslint": "^8.57.1",
-    "jsdom": "^21.1.2",
+    "jsdom": "^25.0.1",
     "react": "^19.2.1",
     "react-dom": "^19.2.1",
     "rimraf": "^5.0.10",
diff --git a/packages/xl-multi-column/src/test/conversions/__snapshots__/multi-column/undefined/external.html b/packages/xl-multi-column/src/test/conversions/__snapshots__/multi-column/undefined/external.html
index cbbcb6592b..2237513b6b 100644
--- a/packages/xl-multi-column/src/test/conversions/__snapshots__/multi-column/undefined/external.html
+++ b/packages/xl-multi-column/src/test/conversions/__snapshots__/multi-column/undefined/external.html
@@ -1 +1 @@
-<div class="bn-block-column-list" data-node-type="columnList" data-id="1" style="display: flex;"><div class="bn-block-column" data-node-type="column" data-id="2" data-width="1" style="flex-grow: 1;"><p>Column Paragraph 0</p><p>Column Paragraph 1</p></div><div class="bn-block-column" data-node-type="column" data-id="5" data-width="1" style="flex-grow: 1;"><p>Column Paragraph 2</p><p>Column Paragraph 3</p></div></div>
\ No newline at end of file
+<div class="bn-block-column-list" data-node-type="columnList" data-id="1" style="display: flex;"><div class="bn-block-column" data-node-type="column" data-id="2" data-width="1" style="flex-grow: 1;" data-nesting-level="1"><p data-nesting-level="2">Column Paragraph 0</p><p data-nesting-level="2">Column Paragraph 1</p></div><div class="bn-block-column" data-node-type="column" data-id="5" data-width="1" style="flex-grow: 1;" data-nesting-level="1"><p data-nesting-level="2">Column Paragraph 2</p><p data-nesting-level="2">Column Paragraph 3</p></div></div>
\ No newline at end of file
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 843becc3bd..3777c26c61 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -5404,15 +5404,12 @@ importers:
       '@types/react-dom':
         specifier: ^19.2.2
         version: 19.2.2(@types/react@19.2.2)
-      '@vitest/ui':
-        specifier: ^2.1.9
-        version: 2.1.9(vitest@2.1.9)
       eslint:
         specifier: ^8.57.1
         version: 8.57.1
       jsdom:
-        specifier: ^21.1.2
-        version: 21.1.2(canvas@2.11.2(encoding@0.1.13))
+        specifier: ^25.0.1
+        version: 25.0.1(canvas@2.11.2(encoding@0.1.13))
       react:
         specifier: ^19.2.1
         version: 19.2.1
@@ -5436,7 +5433,7 @@ importers:
         version: 1.8.1(eslint@8.57.1)(vite@5.4.20(@types/node@24.8.1)(lightningcss@1.30.1)(terser@5.44.1))
       vitest:
         specifier: ^2.1.9
-        version: 2.1.9(@types/node@24.8.1)(@vitest/ui@2.1.9)(jsdom@21.1.2(canvas@2.11.2(encoding@0.1.13)))(lightningcss@1.30.1)(msw@2.11.5(@types/node@24.8.1)(typescript@5.9.3))(terser@5.44.1)
+        version: 2.1.9(@types/node@24.8.1)(@vitest/ui@2.1.9)(jsdom@25.0.1(canvas@2.11.2(encoding@0.1.13)))(lightningcss@1.30.1)(msw@2.11.5(@types/node@24.8.1)(typescript@5.9.3))(terser@5.44.1)
 
   packages/xl-odt-exporter:
     dependencies:
@@ -10023,10 +10020,6 @@ packages:
       '@tiptap/core': ^3.0.0
       '@tiptap/pm': ^3.0.0
 
-  '@tootallnate/once@2.0.0':
-    resolution: {integrity: sha512-XCuKFP5PS55gnMVu3dty8KPatLqUoy/ZYzDzAGCQ8JNFCkLXzmI7vNHCR+XpbZaMWQK/vQubr7PkYq8g470J/A==}
-    engines: {node: '>= 10'}
-
   '@transloadit/prettier-bytes@0.3.5':
     resolution: {integrity: sha512-xF4A3d/ZyX2LJWeQZREZQw+qFX4TGQ8bGVP97OLRt6sPO6T0TNHBFTuRHOJh7RNmYOBmQ9MHxpolD9bXihpuVA==}
 
@@ -10569,10 +10562,6 @@ packages:
     resolution: {integrity: sha512-nrUSn7hzt7J6JWgWGz78ZYI8wj+gdIJdk0Ynjpp8l+trkn58Uqsf6RYrYkEK+3X18EX+TNdtJI0WxAtc+L84SQ==}
     hasBin: true
 
-  abab@2.0.6:
-    resolution: {integrity: sha512-j2afSsaIENvHZN2B8GOpF566vZ5WVk5opAiMTvWgaQT8DkbOqsTfvNAvHoRGU2zzP8cPoqys+xHTRDWW8L+/BA==}
-    deprecated: Use your platform's native atob() and btoa() methods instead
-
   abbrev@1.1.1:
     resolution: {integrity: sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==}
 
@@ -10583,9 +10572,6 @@ packages:
     resolution: {integrity: sha512-PYAthTa2m2VKxuvSD3DPC/Gy+U+sOA1LAuT8mkmRuvw+NACSaeXEQ+NHcVF7rONl6qcaxV3Uuemwawk+7+SJLw==}
     engines: {node: '>= 0.6'}
 
-  acorn-globals@7.0.1:
-    resolution: {integrity: sha512-umOSDSDrfHbTNPuNpC2NSnnA3LUrqpevPb4T9jRx4MagXNS0rs+gwiTcAvqCRmsD6utzsrzNt+ebm00SNWiC3Q==}
-
   acorn-import-attributes@1.9.5:
     resolution: {integrity: sha512-n02Vykv5uA3eHGM/Z2dQrcD56kL8TyDb2p1+0P83PClMnC/nc+anbQRhIOWnSq4Ke/KvDPrY3C9hDtC/A3eHnQ==}
     peerDependencies:
@@ -11301,10 +11287,6 @@ packages:
     engines: {node: '>=4'}
     hasBin: true
 
-  cssstyle@3.0.0:
-    resolution: {integrity: sha512-N4u2ABATi3Qplzf0hWbVCdjenim8F3ojEXpBDF5hBpjzW182MjNGLqfmQ0SkSPeQ+V86ZXgeH8aXj6kayd4jgg==}
-    engines: {node: '>=14'}
-
   cssstyle@4.6.0:
     resolution: {integrity: sha512-2z+rWdzbbSZv6/rhtvzvqeZQHrBaqgogqt85sqFNbabZOuFbCVFb8kPeEtZjiKkbrm395irpNKiYeFeLiQnFPg==}
     engines: {node: '>=18'}
@@ -11318,10 +11300,6 @@ packages:
   data-uri-to-buffer@2.0.2:
     resolution: {integrity: sha512-ND9qDTLc6diwj+Xe5cdAgVTbLVdXbtxTJRXRhli8Mowuaan+0EJOtdqJ0QCHNSSPyoXGx9HX2/VMnKeC34AChA==}
 
-  data-urls@4.0.0:
-    resolution: {integrity: sha512-/mMTei/JXPqvFqQtfyTowxmJVwr2PVAeCcDxyFf6LhoOu/09TX2OX3kb2wzi4DMXcfj4OItwDOnhl5oziPnT6g==}
-    engines: {node: '>=14'}
-
   data-urls@5.0.0:
     resolution: {integrity: sha512-ZYP5VBHshaDAiVZxjbRVcFJpc+4xGgT0bK3vzy1HLN8jTO975HEbuYzZJcHoQEY5K1a0z8YayJkyVETa08eNTg==}
     engines: {node: '>=18'}
@@ -11502,11 +11480,6 @@ packages:
   domelementtype@2.3.0:
     resolution: {integrity: sha512-OLETBj6w0OsagBwdXnPdN0cnMfF9opN69co+7ZrbfPGrdpPVNBUj02spi6B1N7wChLQiPn4CSH/zJvXw56gmHw==}
 
-  domexception@4.0.0:
-    resolution: {integrity: sha512-A2is4PLG+eeSfoTMA95/s4pvAoSo2mKtiM5jlHkAVewmiO8ISFTFKZjH7UAM1Atli/OT/7JHOrJRJiMKUZKYBw==}
-    engines: {node: '>=12'}
-    deprecated: Use your platform's native DOMException instead
-
   domhandler@5.0.3:
     resolution: {integrity: sha512-cgwlv/1iFQiFnU96XXgROh8xTeetsnJiDsTc7TYCLFd9+/WNkIqPTxiM/8pSd8VIrhXGTf1Ny1q1hquVqDJB5w==}
     engines: {node: '>= 4'}
@@ -11673,11 +11646,6 @@ packages:
     resolution: {integrity: sha512-/veY75JbMK4j1yjvuUxuVsiS/hr/4iHs9FTT6cgTexxdE0Ly/glccBAkloH/DofkjRbZU3bnoj38mOmhkZ0lHw==}
     engines: {node: '>=12'}
 
-  escodegen@2.1.0:
-    resolution: {integrity: sha512-2NlIDTwUWJN0mRPQOdtQBzbUHvdGY2P1VXSyU83Q3xKxM7WHX2Ql8dKq782Q9TgQUNOLEzEYu9bzLNj1q88I5w==}
-    engines: {node: '>=6.0'}
-    hasBin: true
-
   eslint-config-react-app@7.0.1:
     resolution: {integrity: sha512-K6rNzvkIeHaTd8m/QEh1Zko0KI7BACWkkneSs6s9cKZC/J27X3eZR6Upt1jkmZ/4FK+XUOPPxMEN7+lbUXfSlA==}
     engines: {node: '>=14.0.0'}
@@ -12388,10 +12356,6 @@ packages:
   hsl-to-rgb-for-reals@1.1.1:
     resolution: {integrity: sha512-LgOWAkrN0rFaQpfdWBQlv/VhkOxb5AsBjk6NQVx4yEzWS923T07X0M1Y0VNko2H52HeSpZrZNNMJ0aFqsdVzQg==}
 
-  html-encoding-sniffer@3.0.0:
-    resolution: {integrity: sha512-oWv4T4yJ52iKrufjnyZPkrN0CH3QnrUqdB6In1g5Fe1mia8GmF36gnfNySxoZtxD5+NmYw1EElVXiBk93UeskA==}
-    engines: {node: '>=12'}
-
   html-encoding-sniffer@4.0.0:
     resolution: {integrity: sha512-Y22oTqIU4uuPgEemfz7NDJz6OeKf12Lsu+QC+s3BVpda64lTiMYCyGwg5ki4vFxkMwQdeZDl2adZoqUgdFuTgQ==}
     engines: {node: '>=18'}
@@ -12412,10 +12376,6 @@ packages:
   htmlparser2@8.0.2:
     resolution: {integrity: sha512-GYdjWKDkbRLkZ5geuHs5NY1puJ+PXwP7+fHPRz06Eirsb9ugf6d8kkXav6ADhcODhFFPMIXyxkxSuMf3D6NCFA==}
 
-  http-proxy-agent@5.0.0:
-    resolution: {integrity: sha512-n2hY8YdoRE1i7r6M0w9DIw5GgZN0G25P8zLCRQ8rjXtTU3vsNFBI/vWK/UIeE6g5MUUz6avwAPXmL6Fy9D/90w==}
-    engines: {node: '>= 6'}
-
   http-proxy-agent@7.0.2:
     resolution: {integrity: sha512-T1gkAiYYDWYx3V5Bmyu7HcfcvL7mUrTWiM6yOfa3PIphViJ/gFPbvidQ+veqSOHci/PxBcDabeUNCzpOODJZig==}
     engines: {node: '>= 14'}
@@ -12820,15 +12780,6 @@ packages:
     resolution: {integrity: sha512-wpxZs9NoxZaJESJGIZTyDEaYpl0FKSA+FB9aJiyemKhMwkxQg63h4T1KJgUGHpTqPDNRcmmYLugrRjJlBtWvRA==}
     hasBin: true
 
-  jsdom@21.1.2:
-    resolution: {integrity: sha512-sCpFmK2jv+1sjff4u7fzft+pUh2KSUbUrEHYHyfSIbGTIcmnjyp83qg6qLwdJ/I3LpTXx33ACxeRL7Lsyc6lGQ==}
-    engines: {node: '>=14'}
-    peerDependencies:
-      canvas: ^2.5.0
-    peerDependenciesMeta:
-      canvas:
-        optional: true
-
   jsdom@25.0.1:
     resolution: {integrity: sha512-8i7LzZj7BF8uplX+ZyOlIz86V6TAsSs+np6m1kpW9u0JWi4z/1t+FzcK1aek+ybTnAC4KhBL4uXCNT0wcUIeCw==}
     engines: {node: '>=18'}
@@ -14200,9 +14151,6 @@ packages:
   proxy-from-env@1.1.0:
     resolution: {integrity: sha512-D+zkORCbA9f1tdWRK0RaCR3GPv50cMxcrz4X8k5LTSUD1Dkw47mKJEZQNunItRTkWwgtaUSo1RVFRIG9ZXiFYg==}
 
-  psl@1.15.0:
-    resolution: {integrity: sha512-JZd3gMVBAVQkSs6HdNZo9Sdo0LNcQeMNP3CozBJb3JYC/QUYZTnKxP+f8oWRX4rHP5EurWxqAHTSwUCjlNKa1w==}
-
   pump@3.0.3:
     resolution: {integrity: sha512-todwxLMY7/heScKmntwQG8CXVkWUOdYxIvY2s0VWAAMh/nd8SoYiRaKjlr7+iCs984f2P8zvrfWcDDYVb73NfA==}
 
@@ -14221,9 +14169,6 @@ packages:
     resolution: {integrity: sha512-pMpnA0qRdFp32b1sJl1wOJNxZLQ2cbQx+k6tjNtZ8CpvVhNqEPRgivZ2WOUev2YMajecdH7ctUPDvEe87nariQ==}
     engines: {node: '>=6.0.0'}
 
-  querystringify@2.2.0:
-    resolution: {integrity: sha512-FIqgj2EUvTa7R50u0rGsyTftzjYmv/a3hO345bZNrqabNqjtgiDMgmo4mkUjd+nzU5oF3dClKqFIPUKybUyqoQ==}
-
   queue-microtask@1.2.3:
     resolution: {integrity: sha512-NuaNSa6flKT5JaSYQzJok04JzTL1CA6aGhv5rfLW3PgqA+M2ChpZQnAC8h8i4ZFkBS8X5RqkDBHA7r4hej3K9A==}
 
@@ -14504,9 +14449,6 @@ packages:
     resolution: {integrity: sha512-gAZ+kLqBdHarXB64XpAe2VCjB7rIRv+mU8tfRWziHRJ5umKsIHN2tLLv6EtMw7WCdP19S0ERVMldNvxYCHnhSQ==}
     engines: {node: '>=8.6.0'}
 
-  requires-port@1.0.0:
-    resolution: {integrity: sha512-KigOCHcocU3XODJxsu8i/j8T9tzT4adHiecwORRQ0ZZFcp7ahwXuRU1m+yuO90C5ZUyGeGfocHDI14M3L3yDAQ==}
-
   resolve-from@4.0.0:
     resolution: {integrity: sha512-pb/MYmXstAkysRFx8piNI1tGFNQIFA3vkE3Gq4EuA1dF6gHp/+vgZqsCGJapvy8N3Q+4o7FwvquPJcnZ7RYy4g==}
     engines: {node: '>=4'}
@@ -14589,9 +14531,6 @@ packages:
   rou3@0.5.1:
     resolution: {integrity: sha512-OXMmJ3zRk2xeXFGfA3K+EOPHC5u7RDFG7lIOx0X1pdnhUkI8MdVrbV+sNsD80ElpUZ+MRHdyxPnFthq9VHs8uQ==}
 
-  rrweb-cssom@0.6.0:
-    resolution: {integrity: sha512-APM0Gt1KoXBz0iIkkdB/kfvGOwC4UuJFeG/c+yV7wSc7q96cG/kJ0HiYCnzivD9SB53cLV1MlHFNfOuPaadYSw==}
-
   rrweb-cssom@0.7.1:
     resolution: {integrity: sha512-TrEMa7JGdVm0UThDJSx7ddw5nVm3UJS9o9CCIZ72B1vSyEZoziDqBYP3XIoi/12lKrJR8rE3jeFHMok2F/Mnsg==}
 
@@ -15146,10 +15085,6 @@ packages:
     resolution: {integrity: sha512-sf4i37nQ2LBx4m3wB74y+ubopq6W/dIzXg0FDGjsYnZHVa1Da8FH853wlL2gtUhg+xJXjfk3kUZS3BRoQeoQBQ==}
     engines: {node: '>=6'}
 
-  tough-cookie@4.1.4:
-    resolution: {integrity: sha512-Loo5UUvLD9ScZ6jh8beX1T6sO1w2/MpCRpEP7V280GKMVUQ0Jzar2U3UJPsrdbziLEMMhu3Ujnq//rhiFuIeag==}
-    engines: {node: '>=6'}
-
   tough-cookie@5.1.2:
     resolution: {integrity: sha512-FVDYdxtnj0G6Qm/DhNPSb8Ju59ULcup3tuJxkFb5K8Bv2pUXILbf0xZWU8PX8Ov19OXljbUyveOFwRMwkXzO+A==}
     engines: {node: '>=16'}
@@ -15161,10 +15096,6 @@ packages:
   tr46@0.0.3:
     resolution: {integrity: sha512-N3WMsuqV66lT30CrXNbEjx4GEwlow3v6rr4mCcv6prnfwhS01rkgyFdjPNBYd9br7LpXV1+Emh01fHnq2Gdgrw==}
 
-  tr46@4.1.1:
-    resolution: {integrity: sha512-2lv/66T7e5yNyhAAC4NaKe5nVavzuGJQVVtRYLyQ2OI8tsJ61PMLlelehb0wi2Hx6+hT/OJUWZcw8MjlSRnxvw==}
-    engines: {node: '>=14'}
-
   tr46@5.1.1:
     resolution: {integrity: sha512-hdF5ZgjTqgAntKkklYw0R03MG2x/bSzTtkxmIRw/sTNV8YXsCJ1tfLAX23lhxhHJlEf3CRCOCGGWw3vI3GaSPw==}
     engines: {node: '>=18'}
@@ -15354,10 +15285,6 @@ packages:
   unist-util-visit@5.0.0:
     resolution: {integrity: sha512-MR04uvD+07cwl/yhVuVWAtw+3GOR/knlL55Nd/wAdblk27GCVt3lqpTivy/tkJcZoNPzTwS1Y+KMojlLDhoTzg==}
 
-  universalify@0.2.0:
-    resolution: {integrity: sha512-CJ1QgKmNg3CwvAv/kOFmtnEN05f0D/cn9QntgNOQlQF9dgvVTHj3t+8JPdjqawCHk7V/KA+fbUqzZ9XWhcqPUg==}
-    engines: {node: '>= 4.0.0'}
-
   unplugin-utils@0.2.5:
     resolution: {integrity: sha512-gwXJnPRewT4rT7sBi/IvxKTjsms7jX7QIDLOClApuZwR49SXbrB1z2NLUZ+vDHyqCj/n58OzRRqaW+B8OZi8vg==}
     engines: {node: '>=18.12.0'}
@@ -15386,9 +15313,6 @@ packages:
   uri-js@4.4.1:
     resolution: {integrity: sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==}
 
-  url-parse@1.5.10:
-    resolution: {integrity: sha512-WypcfiRhfeUP9vvF0j6rw0J3hrWrw6iZv3+22h6iRMJ/8z1Tj6XfLP4DsUix5MhMPnXpiHDoKyoZ/bdCkwBCiQ==}
-
   use-callback-ref@1.3.3:
     resolution: {integrity: sha512-jQL3lRnocaFtu3V00JToYz/4QkNWswxijDaCVNZRiRTO3HQDLsdu1ZtmIUvV4yPp+rvWm5j0y0TG/S61cuijTg==}
     engines: {node: '>=10'}
@@ -15611,10 +15535,6 @@ packages:
   w3c-keyname@2.2.8:
     resolution: {integrity: sha512-dpojBhNsCNN7T82Tm7k26A6G9ML3NkhDsnw9n/eoxSRlVBB4CEtIQ/KTCLI2Fwf3ataSXRhYFkQi3SlnFwPvPQ==}
 
-  w3c-xmlserializer@4.0.0:
-    resolution: {integrity: sha512-d+BFHzbiCx6zGfz0HyQ6Rg69w9k19nviJspaj4yNscGjrHu94sVP+aRm75yEbCh+r2/yR+7q6hux9LVtbuTGBw==}
-    engines: {node: '>=14'}
-
   w3c-xmlserializer@5.0.0:
     resolution: {integrity: sha512-o8qghlI8NZHU1lLPrpi2+Uq7abh4GGPpYANlalzWxyWteJOCsr/P+oPBA49TOLu5FTZO4d3F9MnWJfiMo4BkmA==}
     engines: {node: '>=18'}
@@ -15662,26 +15582,14 @@ packages:
       webpack-cli:
         optional: true
 
-  whatwg-encoding@2.0.0:
-    resolution: {integrity: sha512-p41ogyeMUrw3jWclHWTQg1k05DSVXPLcVxRTYsXUk+ZooOCZLcoYgPZ/HL/D/N+uQPOtcp1me1WhBEaX02mhWg==}
-    engines: {node: '>=12'}
-
   whatwg-encoding@3.1.1:
     resolution: {integrity: sha512-6qN4hJdMwfYBtE3YBTTHhoeuUrDBPZmbQaxWAqSALV/MeEnR5z1xd8UKud2RAkFoPkmB+hli1TZSnyi84xz1vQ==}
     engines: {node: '>=18'}
 
-  whatwg-mimetype@3.0.0:
-    resolution: {integrity: sha512-nt+N2dzIutVRxARx1nghPKGv1xHikU7HKdfafKkLNLindmPU/ch3U31NOCGGA/dmPcmb1VlofO0vnKAcsm0o/Q==}
-    engines: {node: '>=12'}
-
   whatwg-mimetype@4.0.0:
     resolution: {integrity: sha512-QaKxh0eNIi2mE9p2vEdzfagOKHCcj1pJ56EEHGQOVxp8r9/iszLUUV7v89x9O1p/T+NlTM5W7jW6+cz4Fq1YVg==}
     engines: {node: '>=18'}
 
-  whatwg-url@12.0.1:
-    resolution: {integrity: sha512-Ed/LrqB8EPlGxjS+TrsXcpUond1mhccS3pchLhzSgPCnTimUCKj3IZE75pAs5m6heB2U2TMerKFUXheyHY+VDQ==}
-    engines: {node: '>=14'}
-
   whatwg-url@14.2.0:
     resolution: {integrity: sha512-De72GdQZzNTUBBChsXueQUnPKDkg/5A5zp7pFDuQAj5UFoENpiACU0wlCvzpAGnTkj++ihpKwKyYewn/XNUbKw==}
     engines: {node: '>=18'}
@@ -15785,10 +15693,6 @@ packages:
     resolution: {integrity: sha512-7rVi2KMfwfWFl+GpPg6m80IVMWXLRjO+PxTq7V2CDhoGak0wzYzFgUY2m4XJ47OGdXd8eLE8EmwfAmdjw7lC1g==}
     hasBin: true
 
-  xml-name-validator@4.0.0:
-    resolution: {integrity: sha512-ICP2e+jsHvAj2E2lIHxa5tjXRlKDJo4IdvPvCXbXQGdzSfmSpNVyIKMvoZHjDY9DP0zV17iI85o90vRFXNccRw==}
-    engines: {node: '>=12'}
-
   xml-name-validator@5.0.0:
     resolution: {integrity: sha512-EvGK8EJ3DhaHfbRlETOWAS5pO9MZITeauHKJyb8wyajUfQUenkIg2MvLDTZ4T/TgIcm3HU0TFBgWWboAZ30UHg==}
     engines: {node: '>=18'}
@@ -21041,8 +20945,6 @@ snapshots:
       '@tiptap/core': 3.13.0(@tiptap/pm@3.13.0)
       '@tiptap/pm': 3.13.0
 
-  '@tootallnate/once@2.0.0': {}
-
   '@transloadit/prettier-bytes@0.3.5': {}
 
   '@ts-morph/common@0.27.0':
@@ -21620,9 +21522,10 @@ snapshots:
       flatted: 3.3.3
       pathe: 1.1.2
       sirv: 3.0.2
-      tinyglobby: 0.2.15
+      tinyglobby: 0.2.12
       tinyrainbow: 1.2.0
       vitest: 2.1.9(@types/node@24.8.1)(@vitest/ui@2.1.9)(jsdom@25.0.1(canvas@2.11.2(encoding@0.1.13)))(lightningcss@1.30.1)(msw@2.11.5(@types/node@24.8.1)(typescript@5.9.3))(terser@5.44.1)
+    optional: true
 
   '@vitest/utils@2.1.9':
     dependencies:
@@ -21743,8 +21646,6 @@ snapshots:
     dependencies:
       argparse: 2.0.1
 
-  abab@2.0.6: {}
-
   abbrev@1.1.1:
     optional: true
 
@@ -21755,11 +21656,6 @@ snapshots:
       mime-types: 2.1.35
       negotiator: 0.6.3
 
-  acorn-globals@7.0.1:
-    dependencies:
-      acorn: 8.15.0
-      acorn-walk: 8.3.4
-
   acorn-import-attributes@1.9.5(acorn@8.15.0):
     dependencies:
       acorn: 8.15.0
@@ -22529,10 +22425,6 @@ snapshots:
 
   cssesc@3.0.0: {}
 
-  cssstyle@3.0.0:
-    dependencies:
-      rrweb-cssom: 0.6.0
-
   cssstyle@4.6.0:
     dependencies:
       '@asamuzakjp/css-color': 3.2.0
@@ -22544,12 +22436,6 @@ snapshots:
 
   data-uri-to-buffer@2.0.2: {}
 
-  data-urls@4.0.0:
-    dependencies:
-      abab: 2.0.6
-      whatwg-mimetype: 3.0.0
-      whatwg-url: 12.0.1
-
   data-urls@5.0.0:
     dependencies:
       whatwg-mimetype: 4.0.0
@@ -22709,10 +22595,6 @@ snapshots:
 
   domelementtype@2.3.0: {}
 
-  domexception@4.0.0:
-    dependencies:
-      webidl-conversions: 7.0.0
-
   domhandler@5.0.3:
     dependencies:
       domelementtype: 2.3.0
@@ -22992,14 +22874,6 @@ snapshots:
 
   escape-string-regexp@5.0.0: {}
 
-  escodegen@2.1.0:
-    dependencies:
-      esprima: 4.0.1
-      estraverse: 5.3.0
-      esutils: 2.0.3
-    optionalDependencies:
-      source-map: 0.6.1
-
   eslint-config-react-app@7.0.1(@babel/plugin-syntax-flow@7.27.1(@babel/core@7.28.4))(@babel/plugin-transform-react-jsx@7.27.1(@babel/core@7.28.4))(eslint@8.57.1)(typescript@5.9.3):
     dependencies:
       '@babel/core': 7.28.4
@@ -23358,7 +23232,8 @@ snapshots:
 
   fflate@0.7.4: {}
 
-  fflate@0.8.2: {}
+  fflate@0.8.2:
+    optional: true
 
   figures@3.2.0:
     dependencies:
@@ -23980,10 +23855,6 @@ snapshots:
 
   hsl-to-rgb-for-reals@1.1.1: {}
 
-  html-encoding-sniffer@3.0.0:
-    dependencies:
-      whatwg-encoding: 2.0.0
-
   html-encoding-sniffer@4.0.0:
     dependencies:
       whatwg-encoding: 3.1.1
@@ -24009,14 +23880,6 @@ snapshots:
       domutils: 3.2.2
       entities: 4.5.0
 
-  http-proxy-agent@5.0.0:
-    dependencies:
-      '@tootallnate/once': 2.0.0
-      agent-base: 6.0.2
-      debug: 4.4.3
-    transitivePeerDependencies:
-      - supports-color
-
   http-proxy-agent@7.0.2:
     dependencies:
       agent-base: 7.1.4
@@ -24410,41 +24273,6 @@ snapshots:
     dependencies:
       argparse: 2.0.1
 
-  jsdom@21.1.2(canvas@2.11.2(encoding@0.1.13)):
-    dependencies:
-      abab: 2.0.6
-      acorn: 8.15.0
-      acorn-globals: 7.0.1
-      cssstyle: 3.0.0
-      data-urls: 4.0.0
-      decimal.js: 10.6.0
-      domexception: 4.0.0
-      escodegen: 2.1.0
-      form-data: 4.0.4
-      html-encoding-sniffer: 3.0.0
-      http-proxy-agent: 5.0.0
-      https-proxy-agent: 5.0.1
-      is-potential-custom-element-name: 1.0.1
-      nwsapi: 2.2.22
-      parse5: 7.3.0
-      rrweb-cssom: 0.6.0
-      saxes: 6.0.0
-      symbol-tree: 3.2.4
-      tough-cookie: 4.1.4
-      w3c-xmlserializer: 4.0.0
-      webidl-conversions: 7.0.0
-      whatwg-encoding: 2.0.0
-      whatwg-mimetype: 3.0.0
-      whatwg-url: 12.0.1
-      ws: 8.18.3
-      xml-name-validator: 4.0.0
-    optionalDependencies:
-      canvas: 2.11.2(encoding@0.1.13)
-    transitivePeerDependencies:
-      - bufferutil
-      - supports-color
-      - utf-8-validate
-
   jsdom@25.0.1(canvas@2.11.2(encoding@0.1.13)):
     dependencies:
       cssstyle: 4.6.0
@@ -26117,10 +25945,6 @@ snapshots:
 
   proxy-from-env@1.1.0: {}
 
-  psl@1.15.0:
-    dependencies:
-      punycode: 2.3.1
-
   pump@3.0.3:
     dependencies:
       end-of-stream: 1.4.5
@@ -26136,8 +25960,6 @@ snapshots:
 
   pvutils@1.1.3: {}
 
-  querystringify@2.2.0: {}
-
   queue-microtask@1.2.3: {}
 
   queue@6.0.2:
@@ -26523,8 +26345,6 @@ snapshots:
     transitivePeerDependencies:
       - supports-color
 
-  requires-port@1.0.0: {}
-
   resolve-from@4.0.0: {}
 
   resolve-pkg-maps@1.0.0: {}
@@ -26640,8 +26460,6 @@ snapshots:
 
   rou3@0.5.1: {}
 
-  rrweb-cssom@0.6.0: {}
-
   rrweb-cssom@0.7.1: {}
 
   rrweb-cssom@0.8.0: {}
@@ -27297,13 +27115,6 @@ snapshots:
 
   totalist@3.0.1: {}
 
-  tough-cookie@4.1.4:
-    dependencies:
-      psl: 1.15.0
-      punycode: 2.3.1
-      universalify: 0.2.0
-      url-parse: 1.5.10
-
   tough-cookie@5.1.2:
     dependencies:
       tldts: 6.1.86
@@ -27314,10 +27125,6 @@ snapshots:
 
   tr46@0.0.3: {}
 
-  tr46@4.1.1:
-    dependencies:
-      punycode: 2.3.1
-
   tr46@5.1.1:
     dependencies:
       punycode: 2.3.1
@@ -27531,8 +27338,6 @@ snapshots:
       unist-util-is: 6.0.1
       unist-util-visit-parents: 6.0.2
 
-  universalify@0.2.0: {}
-
   unplugin-utils@0.2.5:
     dependencies:
       pathe: 2.0.3
@@ -27568,11 +27373,6 @@ snapshots:
     dependencies:
       punycode: 2.3.1
 
-  url-parse@1.5.10:
-    dependencies:
-      querystringify: 2.2.0
-      requires-port: 1.0.0
-
   use-callback-ref@1.3.3(@types/react@19.2.2)(react@19.2.1):
     dependencies:
       react: 19.2.1
@@ -27855,43 +27655,6 @@ snapshots:
       - supports-color
       - terser
 
-  vitest@2.1.9(@types/node@24.8.1)(@vitest/ui@2.1.9)(jsdom@21.1.2(canvas@2.11.2(encoding@0.1.13)))(lightningcss@1.30.1)(msw@2.11.5(@types/node@24.8.1)(typescript@5.9.3))(terser@5.44.1):
-    dependencies:
-      '@vitest/expect': 2.1.9
-      '@vitest/mocker': 2.1.9(msw@2.11.5(@types/node@24.8.1)(typescript@5.9.3))(vite@5.4.20(@types/node@24.8.1)(lightningcss@1.30.1)(terser@5.44.1))
-      '@vitest/pretty-format': 2.1.9
-      '@vitest/runner': 2.1.9
-      '@vitest/snapshot': 2.1.9
-      '@vitest/spy': 2.1.9
-      '@vitest/utils': 2.1.9
-      chai: 5.3.3
-      debug: 4.4.3
-      expect-type: 1.2.2
-      magic-string: 0.30.19
-      pathe: 1.1.2
-      std-env: 3.10.0
-      tinybench: 2.9.0
-      tinyexec: 0.3.2
-      tinypool: 1.1.1
-      tinyrainbow: 1.2.0
-      vite: 5.4.20(@types/node@24.8.1)(lightningcss@1.30.1)(terser@5.44.1)
-      vite-node: 2.1.9(@types/node@24.8.1)(lightningcss@1.30.1)(terser@5.44.1)
-      why-is-node-running: 2.3.0
-    optionalDependencies:
-      '@types/node': 24.8.1
-      '@vitest/ui': 2.1.9(vitest@2.1.9)
-      jsdom: 21.1.2(canvas@2.11.2(encoding@0.1.13))
-    transitivePeerDependencies:
-      - less
-      - lightningcss
-      - msw
-      - sass
-      - sass-embedded
-      - stylus
-      - sugarss
-      - supports-color
-      - terser
-
   vitest@2.1.9(@types/node@24.8.1)(@vitest/ui@2.1.9)(jsdom@25.0.1(canvas@2.11.2(encoding@0.1.13)))(lightningcss@1.30.1)(msw@2.11.5(@types/node@24.8.1)(typescript@5.9.3))(terser@5.44.1):
     dependencies:
       '@vitest/expect': 2.1.9
@@ -27931,10 +27694,6 @@ snapshots:
 
   w3c-keyname@2.2.8: {}
 
-  w3c-xmlserializer@4.0.0:
-    dependencies:
-      xml-name-validator: 4.0.0
-
   w3c-xmlserializer@5.0.0:
     dependencies:
       xml-name-validator: 5.0.0
@@ -28000,23 +27759,12 @@ snapshots:
       - esbuild
       - uglify-js
 
-  whatwg-encoding@2.0.0:
-    dependencies:
-      iconv-lite: 0.6.3
-
   whatwg-encoding@3.1.1:
     dependencies:
       iconv-lite: 0.6.3
 
-  whatwg-mimetype@3.0.0: {}
-
   whatwg-mimetype@4.0.0: {}
 
-  whatwg-url@12.0.1:
-    dependencies:
-      tr46: 4.1.1
-      webidl-conversions: 7.0.0
-
   whatwg-url@14.2.0:
     dependencies:
       tr46: 5.1.1
@@ -28134,8 +27882,6 @@ snapshots:
     dependencies:
       sax: 1.4.1
 
-  xml-name-validator@4.0.0: {}
-
   xml-name-validator@5.0.0: {}
 
   xml-parser-xo@4.1.5: {}
diff --git a/tests/src/unit/core/clipboard/copy/__snapshots__/text/html/childToParent.html b/tests/src/unit/core/clipboard/copy/__snapshots__/text/html/childToParent.html
index a39b61fc62..261f1d220e 100644
--- a/tests/src/unit/core/clipboard/copy/__snapshots__/text/html/childToParent.html
+++ b/tests/src/unit/core/clipboard/copy/__snapshots__/text/html/childToParent.html
@@ -1,2 +1,2 @@
 <p>Paragraph 1</p>
-<p>Nested Paragraph 1</p>
\ No newline at end of file
+<p data-nesting-level="1">Nested Paragraph 1</p>
\ No newline at end of file
diff --git a/tests/src/unit/core/clipboard/copy/__snapshots__/text/html/childrenToNextParentsChildren.html b/tests/src/unit/core/clipboard/copy/__snapshots__/text/html/childrenToNextParentsChildren.html
index 5f11c91d10..d0d18cabe6 100644
--- a/tests/src/unit/core/clipboard/copy/__snapshots__/text/html/childrenToNextParentsChildren.html
+++ b/tests/src/unit/core/clipboard/copy/__snapshots__/text/html/childrenToNextParentsChildren.html
@@ -2,6 +2,6 @@
 <p>Nested Paragraph 2</p>
 <p>Nested Paragraph 3</p>
 <p>Paragraph 2</p>
-<p>Nested Paragraph 4</p>
-<p>Nested Paragraph 5</p>
-<p>Nested Paragraph 6</p>
\ No newline at end of file
+<p data-nesting-level="1">Nested Paragraph 4</p>
+<p data-nesting-level="1">Nested Paragraph 5</p>
+<p data-nesting-level="1">Nested Paragraph 6</p>
\ No newline at end of file
diff --git a/tests/src/unit/core/clipboard/copy/__snapshots__/text/html/nestedImage.html b/tests/src/unit/core/clipboard/copy/__snapshots__/text/html/nestedImage.html
index 9184e0d829..ece8708071 100644
--- a/tests/src/unit/core/clipboard/copy/__snapshots__/text/html/nestedImage.html
+++ b/tests/src/unit/core/clipboard/copy/__snapshots__/text/html/nestedImage.html
@@ -3,5 +3,6 @@
   src="https://ralfvanveen.com/wp-content/uploads/2021/06/Placeholder-_-Glossary.svg"
   alt="BlockNote image"
   data-url="https://ralfvanveen.com/wp-content/uploads/2021/06/Placeholder-_-Glossary.svg"
+  data-nesting-level="1"
  />
-<p>Nested Paragraph 1</p>
\ No newline at end of file
+<p data-nesting-level="2">Nested Paragraph 1</p>
\ No newline at end of file
diff --git a/tests/src/unit/core/clipboard/copy/__snapshots__/text/html/partialChildToParent.html b/tests/src/unit/core/clipboard/copy/__snapshots__/text/html/partialChildToParent.html
index 3599c4a943..1acf82b823 100644
--- a/tests/src/unit/core/clipboard/copy/__snapshots__/text/html/partialChildToParent.html
+++ b/tests/src/unit/core/clipboard/copy/__snapshots__/text/html/partialChildToParent.html
@@ -1,2 +1,2 @@
 <p>aragraph 1</p>
-<p>N</p>
\ No newline at end of file
+<p data-nesting-level="1">N</p>
\ No newline at end of file
diff --git a/tests/src/unit/core/formatConversion/export/__snapshots__/html/complex/misc.html b/tests/src/unit/core/formatConversion/export/__snapshots__/html/complex/misc.html
index 1bbd5644be..5dd72c369b 100644
--- a/tests/src/unit/core/formatConversion/export/__snapshots__/html/complex/misc.html
+++ b/tests/src/unit/core/formatConversion/export/__snapshots__/html/complex/misc.html
@@ -6,9 +6,13 @@ <h2 style="background-color: rgb(221, 235, 241); color: rgb(223, 171, 1); text-a
     <s>2</s>
   </em>
 </h2>
-<p style="background-color: rgb(251, 228, 228);" data-background-color="red">Paragraph</p>
+<p
+  style="background-color: rgb(251, 228, 228);"
+  data-background-color="red"
+  data-nesting-level="1"
+>Paragraph</p>
 <ul>
-  <li>
+  <li data-nesting-level="1">
     <p class="bn-inline-content"></p>
   </li>
 </ul>
\ No newline at end of file
diff --git a/tests/src/unit/core/formatConversion/export/__snapshots__/html/file/nested.html b/tests/src/unit/core/formatConversion/export/__snapshots__/html/file/nested.html
index 226ee83250..768e2a8359 100644
--- a/tests/src/unit/core/formatConversion/export/__snapshots__/html/file/nested.html
+++ b/tests/src/unit/core/formatConversion/export/__snapshots__/html/file/nested.html
@@ -2,7 +2,12 @@
   <a href="exampleURL">example</a>
   <p>Caption</p>
 </div>
-<div data-name="example" data-url="exampleURL" data-caption="Caption">
+<div
+  data-name="example"
+  data-url="exampleURL"
+  data-caption="Caption"
+  data-nesting-level="1"
+>
   <a href="exampleURL">example</a>
   <p>Caption</p>
 </div>
\ No newline at end of file
diff --git a/tests/src/unit/core/formatConversion/export/__snapshots__/html/image/nested.html b/tests/src/unit/core/formatConversion/export/__snapshots__/html/image/nested.html
index b5dc8743b3..04ccf17c56 100644
--- a/tests/src/unit/core/formatConversion/export/__snapshots__/html/image/nested.html
+++ b/tests/src/unit/core/formatConversion/export/__snapshots__/html/image/nested.html
@@ -2,7 +2,12 @@
   <img src="exampleURL" alt="Caption" width="256" />
   <figcaption>Caption</figcaption>
 </figure>
-<figure data-url="exampleURL" data-caption="Caption" data-preview-width="256">
+<figure
+  data-url="exampleURL"
+  data-caption="Caption"
+  data-preview-width="256"
+  data-nesting-level="1"
+>
   <img src="exampleURL" alt="Caption" width="256" />
   <figcaption>Caption</figcaption>
 </figure>
\ No newline at end of file
diff --git a/tests/src/unit/core/formatConversion/export/__snapshots__/html/lists/nested.html b/tests/src/unit/core/formatConversion/export/__snapshots__/html/lists/nested.html
index 9ceaf0a660..fc16110695 100644
--- a/tests/src/unit/core/formatConversion/export/__snapshots__/html/lists/nested.html
+++ b/tests/src/unit/core/formatConversion/export/__snapshots__/html/lists/nested.html
@@ -5,21 +5,21 @@
   <li>
     <p class="bn-inline-content">Bullet List Item 2</p>
     <ol>
-      <li>
+      <li data-nesting-level="1">
         <p class="bn-inline-content">Numbered List Item 1</p>
       </li>
-      <li>
+      <li data-nesting-level="1">
         <p class="bn-inline-content">Numbered List Item 2</p>
         <ul>
-          <li>
+          <li data-nesting-level="2">
             <input type="checkbox" />
             <p class="bn-inline-content">Check List Item 1</p>
           </li>
-          <li data-checked="true">
+          <li data-checked="true" data-nesting-level="2">
             <input type="checkbox" checked="" />
             <p class="bn-inline-content">Check List Item 2</p>
             <ul>
-              <li>
+              <li data-nesting-level="3">
                 <p class="bn-inline-content">Toggle List Item 1</p>
               </li>
             </ul>
diff --git a/tests/src/unit/core/formatConversion/export/__snapshots__/html/paragraph/nested.html b/tests/src/unit/core/formatConversion/export/__snapshots__/html/paragraph/nested.html
index 5e80eb83e2..f94fb4fbc8 100644
--- a/tests/src/unit/core/formatConversion/export/__snapshots__/html/paragraph/nested.html
+++ b/tests/src/unit/core/formatConversion/export/__snapshots__/html/paragraph/nested.html
@@ -1,3 +1,3 @@
 <p>Paragraph</p>
-<p>Nested Paragraph 1</p>
-<p>Nested Paragraph 2</p>
\ No newline at end of file
+<p data-nesting-level="1">Nested Paragraph 1</p>
+<p data-nesting-level="1">Nested Paragraph 2</p>
\ No newline at end of file
diff --git a/tests/src/unit/react/formatConversion/export/__snapshots__/html/customParagraph/nested.html b/tests/src/unit/react/formatConversion/export/__snapshots__/html/customParagraph/nested.html
index 6b2e1554cf..f539c94f7a 100644
--- a/tests/src/unit/react/formatConversion/export/__snapshots__/html/customParagraph/nested.html
+++ b/tests/src/unit/react/formatConversion/export/__snapshots__/html/customParagraph/nested.html
@@ -1,3 +1,3 @@
 <p class="react-custom-paragraph">Hello World</p>
-<p class="react-custom-paragraph">Hello World</p>
-<p class="react-custom-paragraph">Hello World</p>
\ No newline at end of file
+<p class="react-custom-paragraph" data-nesting-level="1">Hello World</p>
+<p class="react-custom-paragraph" data-nesting-level="1">Hello World</p>
\ No newline at end of file
diff --git a/tests/src/unit/react/formatConversion/export/__snapshots__/html/reactFile/nested.html b/tests/src/unit/react/formatConversion/export/__snapshots__/html/reactFile/nested.html
index 226ee83250..768e2a8359 100644
--- a/tests/src/unit/react/formatConversion/export/__snapshots__/html/reactFile/nested.html
+++ b/tests/src/unit/react/formatConversion/export/__snapshots__/html/reactFile/nested.html
@@ -2,7 +2,12 @@
   <a href="exampleURL">example</a>
   <p>Caption</p>
 </div>
-<div data-name="example" data-url="exampleURL" data-caption="Caption">
+<div
+  data-name="example"
+  data-url="exampleURL"
+  data-caption="Caption"
+  data-nesting-level="1"
+>
   <a href="exampleURL">example</a>
   <p>Caption</p>
 </div>
\ No newline at end of file
diff --git a/tests/src/unit/react/formatConversion/export/__snapshots__/html/reactImage/nested.html b/tests/src/unit/react/formatConversion/export/__snapshots__/html/reactImage/nested.html
index c8a27886ce..8dfc8061ff 100644
--- a/tests/src/unit/react/formatConversion/export/__snapshots__/html/reactImage/nested.html
+++ b/tests/src/unit/react/formatConversion/export/__snapshots__/html/reactImage/nested.html
@@ -12,6 +12,7 @@
   data-url="exampleURL"
   data-caption="Caption"
   data-preview-width="256"
+  data-nesting-level="1"
 >
   <img src="exampleURL" alt="example" width="256" />
   <figcaption>Caption</figcaption>
diff --git a/tests/src/unit/react/formatConversion/export/__snapshots__/html/simpleCustomParagraph/nested.html b/tests/src/unit/react/formatConversion/export/__snapshots__/html/simpleCustomParagraph/nested.html
index 1fa764aff8..235f6e7d43 100644
--- a/tests/src/unit/react/formatConversion/export/__snapshots__/html/simpleCustomParagraph/nested.html
+++ b/tests/src/unit/react/formatConversion/export/__snapshots__/html/simpleCustomParagraph/nested.html
@@ -1,3 +1,3 @@
 <p class="simple-react-custom-paragraph">Custom React Paragraph</p>
-<p class="simple-react-custom-paragraph">Nested React Custom Paragraph 1</p>
-<p class="simple-react-custom-paragraph">Nested React Custom Paragraph 2</p>
\ No newline at end of file
+<p class="simple-react-custom-paragraph" data-nesting-level="1">Nested React Custom Paragraph 1</p>
+<p class="simple-react-custom-paragraph" data-nesting-level="1">Nested React Custom Paragraph 2</p>
\ No newline at end of file