diff --git a/core/events/events_block_create.ts b/core/events/events_block_create.ts
index ca697945488..dc77cd53d4d 100644
--- a/core/events/events_block_create.ts
+++ b/core/events/events_block_create.ts
@@ -14,9 +14,7 @@
 import type {Block} from '../block.js';
 import * as registry from '../registry.js';
 import * as blocks from '../serialization/blocks.js';
-import * as utilsXml from '../utils/xml.js';
 import {Workspace} from '../workspace.js';
-import * as Xml from '../xml.js';
 import {BlockBase, BlockBaseJson} from './events_block_base.js';
 import {EventType} from './type.js';
 import * as eventUtils from './utils.js';
@@ -28,9 +26,6 @@ import * as eventUtils from './utils.js';
 export class BlockCreate extends BlockBase {
   override type = EventType.BLOCK_CREATE;
 
-  /** The XML representation of the created block(s). */
-  xml?: Element | DocumentFragment;
-
   /** The JSON respresentation of the created block(s). */
   json?: blocks.State;
 
@@ -50,7 +45,6 @@ export class BlockCreate extends BlockBase {
       this.recordUndo = false;
     }
 
-    this.xml = Xml.blockToDomWithXY(opt_block);
     this.ids = eventUtils.getDescendantIds(opt_block);
 
     this.json = blocks.save(opt_block, {addCoordinates: true}) as blocks.State;
@@ -63,12 +57,6 @@ export class BlockCreate extends BlockBase {
    */
   override toJson(): BlockCreateJson {
     const json = super.toJson() as BlockCreateJson;
-    if (!this.xml) {
-      throw new Error(
-        'The block XML is undefined. Either pass a block to ' +
-          'the constructor, or call fromJson',
-      );
-    }
     if (!this.ids) {
       throw new Error(
         'The block IDs are undefined. Either pass a block to ' +
@@ -81,7 +69,6 @@ export class BlockCreate extends BlockBase {
           'the constructor, or call fromJson',
       );
     }
-    json['xml'] = Xml.domToText(this.xml);
     json['ids'] = this.ids;
     json['json'] = this.json;
     if (!this.recordUndo) {
@@ -109,7 +96,6 @@ export class BlockCreate extends BlockBase {
       workspace,
       event ?? new BlockCreate(),
     ) as BlockCreate;
-    newEvent.xml = utilsXml.textToDom(json['xml']);
     newEvent.ids = json['ids'];
     newEvent.json = json['json'] as blocks.State;
     if (json['recordUndo'] !== undefined) {
@@ -176,7 +162,6 @@ const allShadowBlocks = function (
 };
 
 export interface BlockCreateJson extends BlockBaseJson {
-  xml: string;
   ids: string[];
   json: object;
   recordUndo?: boolean;
diff --git a/core/events/events_block_delete.ts b/core/events/events_block_delete.ts
index 5dd23160642..97dc21490b1 100644
--- a/core/events/events_block_delete.ts
+++ b/core/events/events_block_delete.ts
@@ -14,9 +14,7 @@
 import type {Block} from '../block.js';
 import * as registry from '../registry.js';
 import * as blocks from '../serialization/blocks.js';
-import * as utilsXml from '../utils/xml.js';
 import {Workspace} from '../workspace.js';
-import * as Xml from '../xml.js';
 import {BlockBase, BlockBaseJson} from './events_block_base.js';
 import {EventType} from './type.js';
 import * as eventUtils from './utils.js';
@@ -26,9 +24,6 @@ import * as eventUtils from './utils.js';
  * deleted.
  */
 export class BlockDelete extends BlockBase {
-  /** The XML representation of the deleted block(s). */
-  oldXml?: Element | DocumentFragment;
-
   /** The JSON respresentation of the deleted block(s). */
   oldJson?: blocks.State;
 
@@ -56,7 +51,6 @@ export class BlockDelete extends BlockBase {
       this.recordUndo = false;
     }
 
-    this.oldXml = Xml.blockToDomWithXY(opt_block);
     this.ids = eventUtils.getDescendantIds(opt_block);
     this.wasShadow = opt_block.isShadow();
     this.oldJson = blocks.save(opt_block, {
@@ -71,12 +65,6 @@ export class BlockDelete extends BlockBase {
    */
   override toJson(): BlockDeleteJson {
     const json = super.toJson() as BlockDeleteJson;
-    if (!this.oldXml) {
-      throw new Error(
-        'The old block XML is undefined. Either pass a block ' +
-          'to the constructor, or call fromJson',
-      );
-    }
     if (!this.ids) {
       throw new Error(
         'The block IDs are undefined. Either pass a block to ' +
@@ -95,7 +83,6 @@ export class BlockDelete extends BlockBase {
           'to the constructor, or call fromJson',
       );
     }
-    json['oldXml'] = Xml.domToText(this.oldXml);
     json['ids'] = this.ids;
     json['wasShadow'] = this.wasShadow;
     json['oldJson'] = this.oldJson;
@@ -124,10 +111,8 @@ export class BlockDelete extends BlockBase {
       workspace,
       event ?? new BlockDelete(),
     ) as BlockDelete;
-    newEvent.oldXml = utilsXml.textToDom(json['oldXml']);
     newEvent.ids = json['ids'];
-    newEvent.wasShadow =
-      json['wasShadow'] || newEvent.oldXml.tagName.toLowerCase() === 'shadow';
+    newEvent.wasShadow = json['wasShadow'];
     newEvent.oldJson = json['oldJson'];
     if (json['recordUndo'] !== undefined) {
       newEvent.recordUndo = json['recordUndo'];
@@ -172,7 +157,6 @@ export class BlockDelete extends BlockBase {
 }
 
 export interface BlockDeleteJson extends BlockBaseJson {
-  oldXml: string;
   ids: string[];
   wasShadow: boolean;
   oldJson: blocks.State;
diff --git a/core/events/events_comment_create.ts b/core/events/events_comment_create.ts
index 637107e3f55..7e940b20da9 100644
--- a/core/events/events_comment_create.ts
+++ b/core/events/events_comment_create.ts
@@ -14,9 +14,7 @@
 import type {WorkspaceComment} from '../comments/workspace_comment.js';
 import * as registry from '../registry.js';
 import * as comments from '../serialization/workspace_comments.js';
-import * as utilsXml from '../utils/xml.js';
 import type {Workspace} from '../workspace.js';
-import * as Xml from '../xml.js';
 import {CommentBase, CommentBaseJson} from './events_comment_base.js';
 import {EventType} from './type.js';
 
@@ -26,9 +24,6 @@ import {EventType} from './type.js';
 export class CommentCreate extends CommentBase {
   override type = EventType.COMMENT_CREATE;
 
-  /** The XML representation of the created workspace comment. */
-  xml?: Element | DocumentFragment;
-
   /** The JSON representation of the created workspace comment. */
   json?: comments.State;
 
@@ -43,7 +38,6 @@ export class CommentCreate extends CommentBase {
       return; // Blank event to be populated by fromJson.
     }
 
-    this.xml = Xml.saveWorkspaceComment(opt_comment);
     this.json = comments.save(opt_comment, {addCoordinates: true});
   }
 
@@ -55,19 +49,12 @@ export class CommentCreate extends CommentBase {
    */
   override toJson(): CommentCreateJson {
     const json = super.toJson() as CommentCreateJson;
-    if (!this.xml) {
-      throw new Error(
-        'The comment XML is undefined. Either pass a comment to ' +
-          'the constructor, or call fromJson',
-      );
-    }
     if (!this.json) {
       throw new Error(
         'The comment JSON is undefined. Either pass a block to ' +
           'the constructor, or call fromJson',
       );
     }
-    json['xml'] = Xml.domToText(this.xml);
     json['json'] = this.json;
     return json;
   }
@@ -91,7 +78,6 @@ export class CommentCreate extends CommentBase {
       workspace,
       event ?? new CommentCreate(),
     ) as CommentCreate;
-    newEvent.xml = utilsXml.textToDom(json['xml']);
     newEvent.json = json['json'];
     return newEvent;
   }
@@ -107,7 +93,6 @@ export class CommentCreate extends CommentBase {
 }
 
 export interface CommentCreateJson extends CommentBaseJson {
-  xml: string;
   json: object;
 }
 
diff --git a/core/events/events_comment_delete.ts b/core/events/events_comment_delete.ts
index 579131e5033..75f7e10ba40 100644
--- a/core/events/events_comment_delete.ts
+++ b/core/events/events_comment_delete.ts
@@ -14,9 +14,7 @@
 import type {WorkspaceComment} from '../comments/workspace_comment.js';
 import * as registry from '../registry.js';
 import * as comments from '../serialization/workspace_comments.js';
-import * as utilsXml from '../utils/xml.js';
 import type {Workspace} from '../workspace.js';
-import * as Xml from '../xml.js';
 import {CommentBase, CommentBaseJson} from './events_comment_base.js';
 import {EventType} from './type.js';
 
@@ -26,9 +24,6 @@ import {EventType} from './type.js';
 export class CommentDelete extends CommentBase {
   override type = EventType.COMMENT_DELETE;
 
-  /** The XML representation of the deleted workspace comment. */
-  xml?: Element;
-
   /** The JSON representation of the created workspace comment. */
   json?: comments.State;
 
@@ -43,7 +38,6 @@ export class CommentDelete extends CommentBase {
       return; // Blank event to be populated by fromJson.
     }
 
-    this.xml = Xml.saveWorkspaceComment(opt_comment);
     this.json = comments.save(opt_comment, {addCoordinates: true});
   }
 
@@ -63,19 +57,12 @@ export class CommentDelete extends CommentBase {
    */
   override toJson(): CommentDeleteJson {
     const json = super.toJson() as CommentDeleteJson;
-    if (!this.xml) {
-      throw new Error(
-        'The comment XML is undefined. Either pass a comment to ' +
-          'the constructor, or call fromJson',
-      );
-    }
     if (!this.json) {
       throw new Error(
         'The comment JSON is undefined. Either pass a block to ' +
           'the constructor, or call fromJson',
       );
     }
-    json['xml'] = Xml.domToText(this.xml);
     json['json'] = this.json;
     return json;
   }
@@ -99,14 +86,12 @@ export class CommentDelete extends CommentBase {
       workspace,
       event ?? new CommentDelete(),
     ) as CommentDelete;
-    newEvent.xml = utilsXml.textToDom(json['xml']);
     newEvent.json = json['json'];
     return newEvent;
   }
 }
 
 export interface CommentDeleteJson extends CommentBaseJson {
-  xml: string;
   json: object;
 }
 
diff --git a/tests/mocha/event_block_create_test.js b/tests/mocha/event_block_create_test.js
index 1672b56bb98..b0f5001de33 100644
--- a/tests/mocha/event_block_create_test.js
+++ b/tests/mocha/event_block_create_test.js
@@ -52,9 +52,6 @@ suite('Block Create Event', function () {
       this.workspace.id,
       'shadowId',
     );
-    const calls = this.eventsFireStub.getCalls();
-    const event = calls[calls.length - 1].args[0];
-    assert.equal(event.xml.tagName, 'shadow');
   });
 
   test('Does not create extra shadow blocks', function () {
@@ -100,8 +97,6 @@ suite('Block Create Event', function () {
 
       const json = origEvent.toJson();
       const newEvent = new Blockly.Events.fromJson(json, this.workspace);
-      delete origEvent.xml; // xml fails deep equals for some reason.
-      delete newEvent.xml; // xml fails deep equals for some reason.
 
       assert.deepEqual(newEvent, origEvent);
     });
diff --git a/tests/mocha/event_test.js b/tests/mocha/event_test.js
index 475c76a5f0a..fd7d904c1e8 100644
--- a/tests/mocha/event_test.js
+++ b/tests/mocha/event_test.js
@@ -639,10 +639,6 @@ suite('Events', function () {
           type: 'create',
           group: '',
           blockId: thisObj.block.id,
-          xml:
-            '<block xmlns="https://developers.google.com/blockly/xml"' +
-            ' type="simple_test_block" id="testBlockId1" x="0" y="0">' +
-            '</block>',
           ids: [thisObj.block.id],
           json: {
             'type': 'simple_test_block',
@@ -660,10 +656,6 @@ suite('Events', function () {
           type: 'create',
           group: '',
           blockId: thisObj.shadowBlock.id,
-          xml:
-            '<shadow xmlns="https://developers.google.com/blockly/xml"' +
-            ' type="simple_test_block" id="testBlockId2" x="0" y="0">' +
-            '</shadow>',
           ids: [thisObj.shadowBlock.id],
           json: {
             'type': 'simple_test_block',
@@ -682,10 +674,6 @@ suite('Events', function () {
           type: 'delete',
           group: '',
           blockId: thisObj.block.id,
-          oldXml:
-            '<block xmlns="https://developers.google.com/blockly/xml"' +
-            ' type="simple_test_block" id="testBlockId1" x="0" y="0">' +
-            '</block>',
           ids: [thisObj.block.id],
           wasShadow: false,
           oldJson: {
@@ -704,10 +692,6 @@ suite('Events', function () {
           type: 'delete',
           group: '',
           blockId: thisObj.shadowBlock.id,
-          oldXml:
-            '<shadow xmlns="https://developers.google.com/blockly/xml"' +
-            ' type="simple_test_block" id="testBlockId2" x="0" y="0">' +
-            '</shadow>',
           ids: [thisObj.shadowBlock.id],
           wasShadow: true,
           oldJson: {
@@ -765,11 +749,6 @@ suite('Events', function () {
           type: 'comment_create',
           group: '',
           commentId: thisObj.comment.id,
-          // TODO: Before merging, is this a dumb change detector?
-          xml: Blockly.Xml.domToText(
-            Blockly.Xml.saveWorkspaceComment(thisObj.comment),
-            {addCoordinates: true},
-          ),
           json: {
             height: 100,
             width: 120,
@@ -788,11 +767,6 @@ suite('Events', function () {
           type: 'comment_delete',
           group: '',
           commentId: thisObj.comment.id,
-          // TODO: Before merging, is this a dumb change detector?
-          xml: Blockly.Xml.domToText(
-            Blockly.Xml.saveWorkspaceComment(thisObj.comment),
-            {addCoordinates: true},
-          ),
           json: {
             height: 100,
             width: 120,
@@ -1405,7 +1379,6 @@ suite('Events', function () {
         const block = workspaceSvg.newBlock('');
         block.initSvg();
         block.setCommentText('test comment');
-        const expectedOldXml = Blockly.Xml.blockToDomWithXY(block);
         const expectedId = block.id;
 
         // Run all queued events.
@@ -1426,7 +1399,7 @@ suite('Events', function () {
           this.eventsFireSpy,
           0,
           Blockly.Events.BlockDelete,
-          {oldXml: expectedOldXml, group: ''},
+          {group: ''},
           workspaceSvg.id,
           expectedId,
         );