diff --git a/.changeset/2026-09-23-ordered-list-courtesy-titles.md b/.changeset/2026-09-23-ordered-list-courtesy-titles.md
new file mode 100644
index 0000000000..31efc6c5ad
--- /dev/null
+++ b/.changeset/2026-09-23-ordered-list-courtesy-titles.md
@@ -0,0 +1,5 @@
+---
+'@tiptap/extension-list': patch
+---
+
+Courtesy titles such as "Ms." and "Dr." are no longer parsed as ordered-list markers. Numbered, lettered, and roman lists are unchanged.
diff --git a/.changeset/omit-default-span-attributes.md b/.changeset/omit-default-span-attributes.md
new file mode 100644
index 0000000000..c1099a83bd
--- /dev/null
+++ b/.changeset/omit-default-span-attributes.md
@@ -0,0 +1,5 @@
+---
+'@tiptap/extension-table': patch
+---
+
+Table cells and headers no longer render the default `colspan="1"` and `rowspan="1"` attributes. Cells that actually span still render them, matching how prosemirror-tables serializes spans.
diff --git a/packages/core/__tests__/splitBlock.spec.ts b/packages/core/__tests__/splitBlock.spec.ts
index 34352c87e0..ed526e102c 100644
--- a/packages/core/__tests__/splitBlock.spec.ts
+++ b/packages/core/__tests__/splitBlock.spec.ts
@@ -2,7 +2,7 @@ import { Editor, Node } from '@tiptap/core'
 import Document from '@tiptap/extension-document'
 import Paragraph from '@tiptap/extension-paragraph'
 import Text from '@tiptap/extension-text'
-import { describe, expect, it } from 'vite-plus/test'
+import { afterEach, describe, expect, it } from 'vite-plus/test'
 
 const Callout = Node.create({
   name: 'callout',
@@ -21,12 +21,21 @@ const Callout = Node.create({
   },
 })
 
-const createEditor = (content: string) =>
-  new Editor({
+let editor: Editor
+
+const createEditor = (content: string) => {
+  editor = new Editor({
     extensions: [Document, Paragraph, Text, Callout],
     content,
   })
 
+  return editor
+}
+
+afterEach(() => {
+  editor.destroy()
+})
+
 describe('splitBlock', () => {
   it('splits a paragraph at the cursor', () => {
     const editor = createEditor('<p>onetwo</p>')
diff --git a/packages/extension-list/src/ordered-list/collectOrderedListItemsFromSource.ts b/packages/extension-list/src/ordered-list/collectOrderedListItemsFromSource.ts
index 976085ebfb..962928b80c 100644
--- a/packages/extension-list/src/ordered-list/collectOrderedListItemsFromSource.ts
+++ b/packages/extension-list/src/ordered-list/collectOrderedListItemsFromSource.ts
@@ -1,5 +1,5 @@
 import type { OrderedListItem } from './utils.js'
-import { collectOrderedListItems, ORDERED_LIST_ITEM_REGEX } from './utils.js'
+import { collectOrderedListItems, matchOrderedListItemLine } from './utils.js'
 
 const ORDERED_LIST_SCAN_WINDOW = 64
 
@@ -39,7 +39,7 @@ export function collectOrderedListItemsFromSource(
   const firstLine = firstLineEnd === -1 ? source : source.slice(0, firstLineEnd)
 
   // Every block start is offered here, so reject non-lists before reading further.
-  if (!ORDERED_LIST_ITEM_REGEX.test(firstLine)) {
+  if (!matchOrderedListItemLine(firstLine)) {
     return [[], 0, []]
   }
 
diff --git a/packages/extension-list/src/ordered-list/utils.ts b/packages/extension-list/src/ordered-list/utils.ts
index d0a3b84aa4..244c026124 100644
--- a/packages/extension-list/src/ordered-list/utils.ts
+++ b/packages/extension-list/src/ordered-list/utils.ts
@@ -26,6 +26,23 @@ export const ORDERED_LIST_ITEM_REGEX = new RegExp(
   `^(\\s*)(${ORDERED_LIST_MARKER_PATTERN})([.)])\\s+(.*)$`,
 )
 
+// Mixed-case titles match the pattern but are not list markers.
+export function matchOrderedListItemLine(line: string): RegExpMatchArray | undefined {
+  const match = line.match(ORDERED_LIST_ITEM_REGEX)
+
+  if (!match) {
+    return undefined
+  }
+
+  const [, , marker] = match
+
+  if (/^\d+$/.test(marker) || detectMarkerType(marker)) {
+    return match
+  }
+
+  return undefined
+}
+
 /**
  * Matches any line that starts with whitespace (indented content).
  * Used to identify continuation content that belongs to a list item.
@@ -57,7 +74,7 @@ export interface OrderedListItem {
 }
 
 function isOrderedListMarkerLine(line: string): boolean {
-  return ORDERED_LIST_ITEM_REGEX.test(line.trimStart())
+  return matchOrderedListItemLine(line.trimStart()) !== undefined
 }
 
 function isBlockContentLine(line: string): boolean {
@@ -131,7 +148,7 @@ export function collectOrderedListItems(lines: string[]): [OrderedListItem[], nu
 
   while (currentLineIndex < lines.length) {
     const line = lines[currentLineIndex]
-    const match = line.match(ORDERED_LIST_ITEM_REGEX)
+    const match = matchOrderedListItemLine(line)
 
     if (!match) {
       break
@@ -152,10 +169,9 @@ export function collectOrderedListItems(lines: string[]): [OrderedListItem[], nu
     // Collect continuation lines for this item (but NOT nested list items)
     while (nextLineIndex < lines.length) {
       const nextLine = lines[nextLineIndex]
-      const nextMatch = nextLine.match(ORDERED_LIST_ITEM_REGEX)
 
       // If it's another list item (nested or not), stop collecting
-      if (nextMatch) {
+      if (matchOrderedListItemLine(nextLine)) {
         break
       }
 
diff --git a/packages/extension-list/tests/integration/orderedListType.test.ts b/packages/extension-list/tests/integration/orderedListType.test.ts
index ba1439d093..a04cbdb8e2 100644
--- a/packages/extension-list/tests/integration/orderedListType.test.ts
+++ b/packages/extension-list/tests/integration/orderedListType.test.ts
@@ -263,6 +263,20 @@ describe('OrderedList type attribute', () => {
       expect(json.content[0].type).not.toBe('orderedList')
     })
 
+    it.each(['Ms. Smith arrived today.', 'Mr. Jones arrived today.', 'Dr. House said hello.'])(
+      'does not parse a courtesy title as an ordered list (%s)',
+      input => {
+        const markdownManager = new MarkdownManager({
+          extensions: [Document, Paragraph, Text, ListItem, OrderedList],
+        })
+
+        const json = markdownManager.parse(input)
+
+        expect(json.content[0].type).toBe('paragraph')
+        expect(json.content[0].content?.[0]).toMatchObject({ type: 'text', text: input })
+      },
+    )
+
     it('round-trips multi-letter alpha markers beyond 26 items', () => {
       const markdownManager = new MarkdownManager({
         extensions: [Document, Paragraph, Text, ListItem, OrderedList],
diff --git a/packages/extension-table/src/cell/table-cell.test.ts b/packages/extension-table/src/cell/table-cell.test.ts
index b2f9a04c07..26430f0d3e 100644
--- a/packages/extension-table/src/cell/table-cell.test.ts
+++ b/packages/extension-table/src/cell/table-cell.test.ts
@@ -131,6 +131,66 @@ describe('extension table cell', () => {
     getEditorEl()?.remove()
   })
 
+  it('should not serialize the default colspan and rowspan', () => {
+    const content = '<table><tbody><tr><td>Cell</td></tr></tbody></table>'
+
+    editor = new Editor({
+      element: createEditorEl(),
+      extensions: [Document, Text, Paragraph, TableCell, TableHeader, TableRow, Table],
+      content,
+    })
+
+    const html = editor.getHTML()
+
+    expect(html).toContain('<td><p>Cell</p></td>')
+    expect(html).not.toContain('colspan="1"')
+    expect(html).not.toContain('rowspan="1"')
+
+    editor?.destroy()
+    getEditorEl()?.remove()
+  })
+
+  it('should not render configured spans for a cell with default spans', () => {
+    editor = new Editor({
+      element: createEditorEl(),
+      extensions: [
+        Document,
+        Text,
+        Paragraph,
+        TableCell.configure({ HTMLAttributes: { colspan: 2, rowspan: 2 } }),
+        TableHeader,
+        TableRow,
+        Table,
+      ],
+      content: '<table><tr><td>Cell</td></tr></table>',
+    })
+
+    expect(editor.getHTML()).toContain('<td><p>Cell</p></td>')
+    expect(editor.view.dom.querySelector('td')?.hasAttribute('colspan')).toBe(false)
+    expect(editor.view.dom.querySelector('td')?.hasAttribute('rowspan')).toBe(false)
+
+    editor.destroy()
+    getEditorEl()?.remove()
+  })
+
+  it('should keep colspan and rowspan when a cell actually spans', () => {
+    const content = '<table><tbody><tr><td colspan="2" rowspan="3">Cell</td></tr></tbody></table>'
+
+    editor = new Editor({
+      element: createEditorEl(),
+      extensions: [Document, Text, Paragraph, TableCell, TableHeader, TableRow, Table],
+      content,
+    })
+
+    const html = editor.getHTML()
+
+    expect(html).toContain('colspan="2"')
+    expect(html).toContain('rowspan="3"')
+
+    editor?.destroy()
+    getEditorEl()?.remove()
+  })
+
   it('should prefer the colwidth attribute over the colgroup col width', () => {
     const content =
       '<table><colgroup><col width="64" /><col /></colgroup><tbody><tr><td colwidth="200">hello</td><td>world</td></tr></tbody></table>'
diff --git a/packages/extension-table/src/cell/table-cell.ts b/packages/extension-table/src/cell/table-cell.ts
index 2ead19ff19..97755d1804 100644
--- a/packages/extension-table/src/cell/table-cell.ts
+++ b/packages/extension-table/src/cell/table-cell.ts
@@ -5,6 +5,7 @@ import { mergeAttributes, Node } from '@tiptap/core'
 import { createAlignAttribute } from '../utils/parseAlign.js'
 import { parseColwidth } from '../utils/parseColwidth.js'
 import { fillEmptyCellContent, isEmptyCellElement } from '../utils/fillEmptyCellContent.js'
+import { omitDefaultSpanAttribute } from '../utils/omitDefaultSpanAttribute.js'
 
 export interface TableCellOptions {
   /**
@@ -63,6 +64,11 @@ export const TableCell = Node.create<TableCellOptions>({
   },
 
   renderHTML({ HTMLAttributes }) {
-    return ['td', mergeAttributes(this.options.HTMLAttributes, HTMLAttributes), 0]
+    const attributes = mergeAttributes(this.options.HTMLAttributes, HTMLAttributes)
+
+    omitDefaultSpanAttribute(attributes, HTMLAttributes, 'colspan')
+    omitDefaultSpanAttribute(attributes, HTMLAttributes, 'rowspan')
+
+    return ['td', attributes, 0]
   },
 })
diff --git a/packages/extension-table/src/header/table-header.test.ts b/packages/extension-table/src/header/table-header.test.ts
index e9544b8429..aaa10f08c9 100644
--- a/packages/extension-table/src/header/table-header.test.ts
+++ b/packages/extension-table/src/header/table-header.test.ts
@@ -130,4 +130,64 @@ describe('extension table header', () => {
     editor?.destroy()
     getEditorEl()?.remove()
   })
+
+  it('should not serialize the default colspan and rowspan', () => {
+    const content = '<table><tbody><tr><th>Cell</th></tr></tbody></table>'
+
+    editor = new Editor({
+      element: createEditorEl(),
+      extensions: [Document, Text, Paragraph, TableCell, TableHeader, TableRow, Table],
+      content,
+    })
+
+    const html = editor.getHTML()
+
+    expect(html).toContain('<th><p>Cell</p></th>')
+    expect(html).not.toContain('colspan="1"')
+    expect(html).not.toContain('rowspan="1"')
+
+    editor?.destroy()
+    getEditorEl()?.remove()
+  })
+
+  it('should not render configured spans for a header with default spans', () => {
+    editor = new Editor({
+      element: createEditorEl(),
+      extensions: [
+        Document,
+        Text,
+        Paragraph,
+        TableCell,
+        TableHeader.configure({ HTMLAttributes: { colspan: 2, rowspan: 2 } }),
+        TableRow,
+        Table,
+      ],
+      content: '<table><tr><th>Cell</th></tr></table>',
+    })
+
+    expect(editor.getHTML()).toContain('<th><p>Cell</p></th>')
+    expect(editor.view.dom.querySelector('th')?.hasAttribute('colspan')).toBe(false)
+    expect(editor.view.dom.querySelector('th')?.hasAttribute('rowspan')).toBe(false)
+
+    editor.destroy()
+    getEditorEl()?.remove()
+  })
+
+  it('should keep colspan and rowspan when a header actually spans', () => {
+    const content = '<table><tbody><tr><th colspan="2" rowspan="3">Cell</th></tr></tbody></table>'
+
+    editor = new Editor({
+      element: createEditorEl(),
+      extensions: [Document, Text, Paragraph, TableCell, TableHeader, TableRow, Table],
+      content,
+    })
+
+    const html = editor.getHTML()
+
+    expect(html).toContain('colspan="2"')
+    expect(html).toContain('rowspan="3"')
+
+    editor?.destroy()
+    getEditorEl()?.remove()
+  })
 })
diff --git a/packages/extension-table/src/header/table-header.ts b/packages/extension-table/src/header/table-header.ts
index fb5ce90603..9cce9b08d8 100644
--- a/packages/extension-table/src/header/table-header.ts
+++ b/packages/extension-table/src/header/table-header.ts
@@ -5,6 +5,7 @@ import { mergeAttributes, Node } from '@tiptap/core'
 import { createAlignAttribute } from '../utils/parseAlign.js'
 import { parseColwidth } from '../utils/parseColwidth.js'
 import { fillEmptyCellContent, isEmptyCellElement } from '../utils/fillEmptyCellContent.js'
+import { omitDefaultSpanAttribute } from '../utils/omitDefaultSpanAttribute.js'
 
 export interface TableHeaderOptions {
   /**
@@ -63,6 +64,11 @@ export const TableHeader = Node.create<TableHeaderOptions>({
   },
 
   renderHTML({ HTMLAttributes }) {
-    return ['th', mergeAttributes(this.options.HTMLAttributes, HTMLAttributes), 0]
+    const attributes = mergeAttributes(this.options.HTMLAttributes, HTMLAttributes)
+
+    omitDefaultSpanAttribute(attributes, HTMLAttributes, 'colspan')
+    omitDefaultSpanAttribute(attributes, HTMLAttributes, 'rowspan')
+
+    return ['th', attributes, 0]
   },
 })
diff --git a/packages/extension-table/src/utils/omitDefaultSpanAttribute.ts b/packages/extension-table/src/utils/omitDefaultSpanAttribute.ts
new file mode 100644
index 0000000000..f5b8296c59
--- /dev/null
+++ b/packages/extension-table/src/utils/omitDefaultSpanAttribute.ts
@@ -0,0 +1,15 @@
+export function omitDefaultSpanAttribute(
+  attributes: Record<string, unknown>,
+  renderedAttributes: Record<string, unknown>,
+  name: 'colspan' | 'rowspan',
+): void {
+  if (!(name in renderedAttributes)) {
+    return
+  }
+
+  const value = renderedAttributes[name]
+
+  if (value === 1 || value === '1' || value === null || value === undefined) {
+    delete attributes[name]
+  }
+}
diff --git a/packages/extension-table/tests/integration/tableCommands.test.ts b/packages/extension-table/tests/integration/tableCommands.test.ts
index 4748849a55..0cb473d434 100644
--- a/packages/extension-table/tests/integration/tableCommands.test.ts
+++ b/packages/extension-table/tests/integration/tableCommands.test.ts
@@ -268,7 +268,7 @@ describe('Table commands', () => {
     editor.commands.clearContent()
     editor.commands.insertTable({ cols: 1, rows: 1, withHeaderRow: false })
     expect(editor.getHTML()).toBe(
-      '<table style="min-width: 25px;"><colgroup><col style="min-width: 25px;"></colgroup><tbody><tr><td colspan="1" rowspan="1"><p></p></td></tr></tbody></table>',
+      '<table style="min-width: 25px;"><colgroup><col style="min-width: 25px;"></colgroup><tbody><tr><td><p></p></td></tr></tbody></table>',
     )
   })
 
@@ -276,7 +276,7 @@ describe('Table commands', () => {
     editor.commands.clearContent()
     editor.commands.insertTable({ cols: 1, rows: 1, withHeaderRow: true })
     expect(editor.getHTML()).toBe(
-      '<table style="min-width: 25px;"><colgroup><col style="min-width: 25px;"></colgroup><tbody><tr><th colspan="1" rowspan="1"><p></p></th></tr></tbody></table>',
+      '<table style="min-width: 25px;"><colgroup><col style="min-width: 25px;"></colgroup><tbody><tr><th><p></p></th></tr></tbody></table>',
     )
   })