markdown: Add support for `colspan` and `rowspan` for HTML tables #39898

RemcoSmitsDev · 2025-10-09T18:42:23Z

This PR adds support for colspan feature that is only supported for HTML tables. I also fixed an edge case where the right side border was not applied because it didn't match the total column count.

Before

After

<table>
    <tr>
        <th rowspan="2">Region</th>
        <th colspan="2">Revenue</th>
        <th rowspan="2">Growth</th>
    </tr>
    <tr>
        <th>Q2 2024</th>
        <th>Q3 2024</th>
    </tr>
    <tr>
        <td>North America</td>
        <td>$2.8M</td>
        <td>$2.4B</td>
        <td>+85,614%</td>
    </tr>
    <tr>
        <td>Europe</td>
        <td>$1.2M</td>
        <td>$1.9B</td>
        <td>+158,233%</td>
    </tr>
    <tr>
        <td>Asia-Pacific</td>
        <td>$0.5M</td>
        <td>$1.4B</td>
        <td>+279,900%</td>
    </tr>
</table>

TODO:

Add tests for rending logic
Test all the tables again

cc @bennetbo

Release Notes:

Markdown: Added support for colspan and rowspan for HTML tables

Partially addreses zed-industries#39837

Co-Authored-By: Zed AI <ai@zed.nl>

Angelk90 · 2025-10-13T08:29:26Z

@RemcoSmitsDev :
I tested the code.

Here are some considerations:

First table tested:

The text Region should take up two vertical lines, but instead it only takes one. The two lines should be joined, and the text should be central and bold.
All text in the header should be central and bold.

Second table tested:

All text in the header should be central and bold.
Side texts like Contact should be bold. I don't know if they're central.

Third table tested:

All text in the header should be central and bold.
Side texts like 1 bedroom should be bold. I don't know if they're central.
City names, such as Rome, should be central and bold, considering all columns.

Region	Revenue		Growth
Region	Q2 2024	Q3 2024	Growth
North America	$2.8M	$2.4B	+85,614%
Europe	$1.2M	$1.9B	+158,233%
Asia-Pacific	$0.5M	$1.4B	+279,900%

Supplier contacts

	Example 1 Ltd	Example 2 Co
Contact	James Phillips	Marie Beauchamp
Position	Sales Director	Sales Manager
Email	jp@1ltd.example.com	marie@2co.example.com
	Example 3 Ltd	Example 4 Inc
Contact	Suzette Jones	Alex Howe
Position	Sales Officer	Sales Director
Email	Suz@ltd3.example.com	howe@4inc.example.com

Availability of holiday accommodation

Paris
	Studio	Apt	Chalet	Villa
1 bedroom	11	20	25	23
2 bedroom	-	43	52	32
3 bedroom	-	13	15	40
Rome
1 bedroom	13	21	22	3
2 bedroom	-	23	43	30
3 bedroom	-	16	32	40

Rome

	Studio	Apt	Chalet	Villa
1 bedroom	13	21	22	3
2 bedroom	-	23	43	30
3 bedroom	-	16	32	40

code:

<table>
    <tr>
        <th rowspan="2">Region</th>
        <th colspan="2">Revenue</th>
        <th rowspan="2">Growth</th>
    </tr>
    <tr>
        <th>Q2 2024</th>
        <th>Q3 2024</th>
    </tr>
    <tr>
        <td>North America</td>
        <td>$2.8M</td>
        <td>$2.4B</td>
        <td>+85,614%</td>
    </tr>
    <tr>
        <td>Europe</td>
        <td>$1.2M</td>
        <td>$1.9B</td>
        <td>+158,233%</td>
    </tr>
    <tr>
        <td>Asia-Pacific</td>
        <td>$0.5M</td>
        <td>$1.4B</td>
        <td>+279,900%</td>
    </tr>
</table>

<table>
  <caption>
    Supplier contacts
  </caption>
  <tr>
    <th id="blank">&nbsp;</th>
    <th id="co1" headers="blank">Example 1 Ltd</th>
    <th id="co2" headers="blank">Example 2 Co</th>
  </tr>
  <tr>
    <th id="c1" headers="blank">Contact</th>
    <td headers="co1 c1">James Phillips</td>
    <td headers="co2 c1">Marie Beauchamp</td>
  </tr>
  <tr>
    <th id="p1"  headers="blank">Position</th>
    <td headers="co1 p1">Sales Director</td>
    <td headers="co2 p1">Sales Manager</td>
  </tr>
  <tr>
    <th id="e1"  headers="blank">Email</th>
    <td headers="co1 e1">jp@1ltd.example.com</td>
    <td headers="co2 e1">marie@2co.example.com</td>
  </tr>
  <tr>
    <th>&nbsp;</th>
    <th id="co3" headers="blank">Example 3 Ltd</th>
    <th id="co4" headers="blank">Example 4 Inc</th>
  </tr>
  <tr>
    <th id="c2"  headers="blank">Contact</th>
    <td headers="co3 c2">Suzette Jones</td>
    <td headers="co4 c2">Alex Howe</td>
  </tr>
  <tr>
    <th id="p2" headers="blank">Position</th>
    <td headers="co3 p2">Sales Officer</td>
    <td headers="co4 p2">Sales Director</td>
  </tr>
  <tr>
    <th id="e2" headers="blank">Email</th>
    <td headers="co3 e2">Suz@ltd3.example.com</td>
    <td headers="co4 e2">howe@4inc.example.com</td>
  </tr>
</table>

<table summary="Column one has the location and size of accommodation, other columns show the type and number of properties available">
<caption>
    Availability of holiday accommodation
</caption>
<thead>
    <tr>
        <td></td>
        <th id="stud" scope="col">
            Studio
        </th>
        <th id="apt" scope="col">
            <abbr title="Apartment">Apt</abbr>
        </th>
        <th id="chal" scope="col">
            Chalet
        </th>
        <th id="villa" scope="col">
            Villa
        </th>
    </tr>
</thead>
<tbody>
    <tr>
        <th id="par" class="span" colspan="5" scope="colgroup">
            Paris
        </th>
    </tr>
    <tr>
        <th headers="par" id="pbed1">
            1 bedroom
        </th>
        <td headers="par pbed1 stud">
            11
        </td>
        <td headers="par pbed1 apt">
            20
        </td>
        <td headers="par pbed1 chal">
            25
        </td>
        <td headers="par pbed1 villa">
            23
        </td>
    </tr>
    <tr>
        <th headers="par" id="pbed2">
            2 bedroom
        </th>
        <td headers="par pbed2 stud">
            -
        </td>
        <td headers="par pbed2 apt">
            43
        </td>
        <td headers="par pbed2 chal">
            52
        </td>
        <td headers="par pbed2 villa">
            32
        </td>
    </tr>
    <tr>
        <th headers="par" id="pbed3">
            3 bedroom
        </th>
        <td headers="par pbed3 stud">
            -
        </td>
        <td headers="par pbed3 apt">
            13
        </td>
        <td headers="par pbed3 chal">
            15
        </td>
        <td headers="par pbed3 villa">
            40
        </td>
    </tr>
    <tr>
        <th id="rome" class="span" colspan="5" scope="colgroup">
            Rome
        </th>
    </tr>
    <tr>
        <th id="rbed1" headers="rome">
            1 bedroom
        </th>
        <td headers="rome rbed1 stud">
            13
        </td>
        <td headers="rome rbed1 apt">
            21
        </td>
        <td headers="rome rbed1 chal">
            22
        </td>
        <td headers="rome rbed1 villa">
            3
        </td>
    </tr>
    <tr>
        <th id="rbed2" headers="rome">
            2 bedroom
        </th>
        <td headers="rome rbed2 stud">
            -
        </td>
        <td headers="rome rbed2 apt">
            23
        </td>
        <td headers="rome rbed2 chal">
            43
        </td>
        <td headers="rome rbed2 villa">
            30
        </td>
    </tr>
    <tr>
        <th id="rbed3" headers="rome">
            3 bedroom
        </th>
        <td headers="rome rbed3 stud">
            -
        </td>
        <td headers="rome rbed3 apt">
            16
        </td>
        <td headers="rome rbed3 chal">
            32
        </td>
        <td headers="rome rbed3 villa">
            40
        </td>
    </tr>
</tbody>
</table>

<table class="numbers" style="margin-top:1em;">
<caption>
    Rome
</caption>
<thead>
    <tr>
        <td></td>
        <th scope="col">
            Studio
        </th>
        <th scope="col">
            <abbr title="Apartment">Apt</abbr>
        </th>
        <th scope="col">
            Chalet
        </th>
        <th scope="col">
            Villa
        </th>
    </tr>
</thead>
<tbody>
    <tr>
        <th id="rbed1">
            1 bedroom
        </th>
        <td>
            13
        </td>
        <td>
            21
        </td>
        <td>
            22
        </td>
        <td>
            3
        </td>
    </tr>
    <tr>
        <th id="rbed2">
            2 bedroom
        </th>
        <td>
            -
        </td>
        <td>
            23
        </td>
        <td>
            43
        </td>
        <td>
            30
        </td>
    </tr>
    <tr>
        <th id="rbed3">
            3 bedroom
        </th>
        <td>
            -
        </td>
        <td>
            16
        </td>
        <td>
            32
        </td>
        <td>
            40
        </td>
    </tr>
</tbody>
</table>

RemcoSmitsDev · 2025-10-19T15:59:40Z

@Angelk90 thanks for testing the PR, I will try to improve this PR to actually expand the row as HTML tables do.

RemcoSmitsDev · 2025-10-19T18:07:50Z

To correctly fix the row span, we need to first fix the grid sizing issue. Right now, you need to specify the container (div().grid()) size in order the grid to take up the needed space.

Co-authored-by: Anthony Eid <hello@anthonyeid.me>

Problem summarized by agent: he `grid_rows()` method is creating rows with `minmax(0, 1fr)` which means: - Minimum size: 0 (can collapse to nothing) - Maximum size: 1fr (equal fractions) This is the problem! The rows can collapse to 0 height. We need to use `auto` sizing for rows instead so they size based on their content. Let me check if there's an alternative or if we need to not set grid_rows at all: Co-authored-by: Anthony Eid <hello@anthonyeid.me>

Co-authored-by: Anthony Eid <hello@anthonyeid.me>

RemcoSmitsDev · 2025-10-21T21:18:39Z

Only need to test all the old tables so i didnt break anything, will do that tomorrow.

RemcoSmitsDev · 2025-10-22T08:43:38Z

Should be good to go.

Angelk90 · 2025-10-22T12:45:25Z

@RemcoSmitsDev : I'm not sure how it should look, but I've highlighted the areas where I'm unsure about the colors used, seeing how GitHub does it (see below).

First table highlighted, in position, the two following columns should perhaps have the same color as the position column.

Second and third table highlighted, first row, first column, should perhaps have the same color as the other headers.

In the second table, the odd-numbered rows in the highlighted columns do not match the same color as the column preceding them; I'm talking about the same reference row.

In the third table, the even-numbered rows in the highlighted columns do not match the same color as the column preceding them; I'm talking about the same reference row.

I hope I've been clear, but I'm not sure what the correct approach is.

Region	Revenue		Growth
Region	Q2 2024	Q3 2024	Growth
North America	$2.8M	$2.4B	+85,614%
Europe	$1.2M	$1.9B	+158,233%
Asia-Pacific	$0.5M	$1.4B	+279,900%

Supplier contacts

	Example 1 Ltd	Example 2 Co
Contact	James Phillips	Marie Beauchamp
Position	Sales Director	Sales Manager
Email	jp@1ltd.example.com	marie@2co.example.com
	Example 3 Ltd	Example 4 Inc
Contact	Suzette Jones	Alex Howe
Position	Sales Officer	Sales Director
Email	Suz@ltd3.example.com	howe@4inc.example.com

Availability of holiday accommodation

Paris
	Studio	Apt	Chalet	Villa
1 bedroom	11	20	25	23
2 bedroom	-	43	52	32
3 bedroom	-	13	15	40
Rome
1 bedroom	13	21	22	3
2 bedroom	-	23	43	30
3 bedroom	-	16	32	40

Rome

	Studio	Apt	Chalet	Villa
1 bedroom	13	21	22	3
2 bedroom	-	23	43	30
3 bedroom	-	16	32	40

code:

<table>
    <tr>
        <th rowspan="2">Region</th>
        <th colspan="2">Revenue</th>
        <th rowspan="2">Growth</th>
    </tr>
    <tr>
        <th>Q2 2024</th>
        <th>Q3 2024</th>
    </tr>
    <tr>
        <td>North America</td>
        <td>$2.8M</td>
        <td>$2.4B</td>
        <td>+85,614%</td>
    </tr>
    <tr>
        <td>Europe</td>
        <td>$1.2M</td>
        <td>$1.9B</td>
        <td>+158,233%</td>
    </tr>
    <tr>
        <td>Asia-Pacific</td>
        <td>$0.5M</td>
        <td>$1.4B</td>
        <td>+279,900%</td>
    </tr>
</table>

<table>
  <caption>
    Supplier contacts
  </caption>
  <tr>
    <th id="blank">&nbsp;</th>
    <th id="co1" headers="blank">Example 1 Ltd</th>
    <th id="co2" headers="blank">Example 2 Co</th>
  </tr>
  <tr>
    <th id="c1" headers="blank">Contact</th>
    <td headers="co1 c1">James Phillips</td>
    <td headers="co2 c1">Marie Beauchamp</td>
  </tr>
  <tr>
    <th id="p1"  headers="blank">Position</th>
    <td headers="co1 p1">Sales Director</td>
    <td headers="co2 p1">Sales Manager</td>
  </tr>
  <tr>
    <th id="e1"  headers="blank">Email</th>
    <td headers="co1 e1">jp@1ltd.example.com</td>
    <td headers="co2 e1">marie@2co.example.com</td>
  </tr>
  <tr>
    <th>&nbsp;</th>
    <th id="co3" headers="blank">Example 3 Ltd</th>
    <th id="co4" headers="blank">Example 4 Inc</th>
  </tr>
  <tr>
    <th id="c2"  headers="blank">Contact</th>
    <td headers="co3 c2">Suzette Jones</td>
    <td headers="co4 c2">Alex Howe</td>
  </tr>
  <tr>
    <th id="p2" headers="blank">Position</th>
    <td headers="co3 p2">Sales Officer</td>
    <td headers="co4 p2">Sales Director</td>
  </tr>
  <tr>
    <th id="e2" headers="blank">Email</th>
    <td headers="co3 e2">Suz@ltd3.example.com</td>
    <td headers="co4 e2">howe@4inc.example.com</td>
  </tr>
</table>

<table summary="Column one has the location and size of accommodation, other columns show the type and number of properties available">
<caption>
    Availability of holiday accommodation
</caption>
<thead>
    <tr>
        <td></td>
        <th id="stud" scope="col">
            Studio
        </th>
        <th id="apt" scope="col">
            <abbr title="Apartment">Apt</abbr>
        </th>
        <th id="chal" scope="col">
            Chalet
        </th>
        <th id="villa" scope="col">
            Villa
        </th>
    </tr>
</thead>
<tbody>
    <tr>
        <th id="par" class="span" colspan="5" scope="colgroup">
            Paris
        </th>
    </tr>
    <tr>
        <th headers="par" id="pbed1">
            1 bedroom
        </th>
        <td headers="par pbed1 stud">
            11
        </td>
        <td headers="par pbed1 apt">
            20
        </td>
        <td headers="par pbed1 chal">
            25
        </td>
        <td headers="par pbed1 villa">
            23
        </td>
    </tr>
    <tr>
        <th headers="par" id="pbed2">
            2 bedroom
        </th>
        <td headers="par pbed2 stud">
            -
        </td>
        <td headers="par pbed2 apt">
            43
        </td>
        <td headers="par pbed2 chal">
            52
        </td>
        <td headers="par pbed2 villa">
            32
        </td>
    </tr>
    <tr>
        <th headers="par" id="pbed3">
            3 bedroom
        </th>
        <td headers="par pbed3 stud">
            -
        </td>
        <td headers="par pbed3 apt">
            13
        </td>
        <td headers="par pbed3 chal">
            15
        </td>
        <td headers="par pbed3 villa">
            40
        </td>
    </tr>
    <tr>
        <th id="rome" class="span" colspan="5" scope="colgroup">
            Rome
        </th>
    </tr>
    <tr>
        <th id="rbed1" headers="rome">
            1 bedroom
        </th>
        <td headers="rome rbed1 stud">
            13
        </td>
        <td headers="rome rbed1 apt">
            21
        </td>
        <td headers="rome rbed1 chal">
            22
        </td>
        <td headers="rome rbed1 villa">
            3
        </td>
    </tr>
    <tr>
        <th id="rbed2" headers="rome">
            2 bedroom
        </th>
        <td headers="rome rbed2 stud">
            -
        </td>
        <td headers="rome rbed2 apt">
            23
        </td>
        <td headers="rome rbed2 chal">
            43
        </td>
        <td headers="rome rbed2 villa">
            30
        </td>
    </tr>
    <tr>
        <th id="rbed3" headers="rome">
            3 bedroom
        </th>
        <td headers="rome rbed3 stud">
            -
        </td>
        <td headers="rome rbed3 apt">
            16
        </td>
        <td headers="rome rbed3 chal">
            32
        </td>
        <td headers="rome rbed3 villa">
            40
        </td>
    </tr>
</tbody>
</table>

<table class="numbers" style="margin-top:1em;">
<caption>
    Rome
</caption>
<thead>
    <tr>
        <td></td>
        <th scope="col">
            Studio
        </th>
        <th scope="col">
            <abbr title="Apartment">Apt</abbr>
        </th>
        <th scope="col">
            Chalet
        </th>
        <th scope="col">
            Villa
        </th>
    </tr>
</thead>
<tbody>
    <tr>
        <th id="rbed1">
            1 bedroom
        </th>
        <td>
            13
        </td>
        <td>
            21
        </td>
        <td>
            22
        </td>
        <td>
            3
        </td>
    </tr>
    <tr>
        <th id="rbed2">
            2 bedroom
        </th>
        <td>
            -
        </td>
        <td>
            23
        </td>
        <td>
            43
        </td>
        <td>
            30
        </td>
    </tr>
    <tr>
        <th id="rbed3">
            3 bedroom
        </th>
        <td>
            -
        </td>
        <td>
            16
        </td>
        <td>
            32
        </td>
        <td>
            40
        </td>
    </tr>
</tbody>
</table>

@bennetbo

…d-industries#39898) Closes zed-industries#39837 This PR adds support for `colspan` feature that is only supported for HTML tables. I also fixed an edge case where the right side border was not applied because it didn't match the total column count. **Before** <img width="725" height="179" alt="499166907-385cc787-fc89-4e6d-bf06-c72c3c0bd775" src="https://github.com/user-attachments/assets/69586053-9893-4c92-aa89-7830d2bc7a6d" /> **After** <img width="1165" height="180" alt="Screenshot 2025-10-21 at 22 51 55" src="https://github.com/user-attachments/assets/f40686e7-d95b-45a6-be42-e226e2f77483" /> ```html <table> <tr> <th rowspan="2">Region</th> <th colspan="2">Revenue</th> <th rowspan="2">Growth</th> </tr> <tr> <th>Q2 2024</th> <th>Q3 2024</th> </tr> <tr> <td>North America</td> <td>$2.8M</td> <td>$2.4B</td> <td>+85,614%</td> </tr> <tr> <td>Europe</td> <td>$1.2M</td> <td>$1.9B</td> <td>+158,233%</td> </tr> <tr> <td>Asia-Pacific</td> <td>$0.5M</td> <td>$1.4B</td> <td>+279,900%</td> </tr> </table> ``` **TODO**: - [x] Add tests for rending logic - [x] Test all the tables again cc @bennetbo Release Notes: - Markdown: Added support for `colspan` and `rowspan` for HTML tables --------- Co-authored-by: Zed AI <ai@zed.nl> Co-authored-by: Anthony Eid <hello@anthonyeid.me>

Follow-up: #39898 Right now, we don't fill the empty column when the current row count is less than the max row count. This PR fixes that by filling it with an empty cell. So the table columns don't flow in the wrong direction, as you can see inside the first screenshot. **Before** <img width="1095" height="182" alt="Screenshot 2025-10-24 at 16 09 02" src="https://github.com/user-attachments/assets/e3abf24e-c190-4bd7-b43a-39f2f01ecd1c" /> **After** <img width="1165" height="178" alt="Screenshot 2025-10-24 at 16 19 17" src="https://github.com/user-attachments/assets/427c25f9-82a7-498b-a1a2-d71e4c288fe5" /> **Code example** ```html <table> <tr> <th rowspan="2">Region</th> <th colspan="2">Revenue</th> <th rowspan="2">Growth</th> </tr> <tr> <th>Q2 2024</th> <th>Q3 2024</th> </tr> <tr> <td>North America</td> <td>$2.8M</td> <td>$2.4B</td> <td>+85,614%</td> <td>+99%</td> // extra column here </tr> <tr> <td>Europe</td> <td>$1.2M</td> <td>$1.9B</td> <td>+158,233%</td> </tr> <tr> <td>Asia-Pacific</td> <td>$0.5M</td> <td>$1.4B</td> <td>+279,900%</td> </tr> </table> ``` **Note** there are no release notes, as the previous PR didn't get released yet. Release Notes: - N/A

RemcoSmitsDev added 5 commits October 9, 2025 12:04

WIP refactor to soon support col span

8d3e49d

Partially addreses zed-industries#39837

More wip

80e250b

clean up

d05f15d

Rename

a444c0a

Remove comments

6a02df4

cla-bot bot added the cla-signed The user has signed the Contributor License Agreement label Oct 9, 2025

github-actions bot added the community champion Issues filed by our amazing community champions! 🫶 label Oct 9, 2025

RemcoSmitsDev added 3 commits October 10, 2025 17:22

Merge branch 'main' into markdown-support-col-span

2649043

Add test for calculate_table_columns_count method

03aaa81

Add tests

11ffad2

RemcoSmitsDev marked this pull request as ready for review October 10, 2025 19:44

Simplify

f5c8646

RemcoSmitsDev marked this pull request as draft October 12, 2025 08:48

RemcoSmitsDev marked this pull request as ready for review October 12, 2025 09:19

RemcoSmitsDev changed the title ~~markdown: Add support for colspan with HTML tables~~ Oct 12, 2025

RemcoSmitsDev and others added 2 commits October 12, 2025 11:41

Add row span support

f1cdf58

Co-Authored-By: Zed AI <ai@zed.nl>

Update tests

2565c00

SomeoneToIgnore assigned bennetbo Oct 13, 2025

Merge branch 'main' into markdown-support-col-span

5b1b715

RemcoSmitsDev marked this pull request as draft October 19, 2025 15:57

RemcoSmitsDev and others added 2 commits October 21, 2025 20:57

WIP

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Co-authored-by: Anthony Eid <hello@anthonyeid.me>

RemcoSmitsDev force-pushed the markdown-support-col-span branch from 2f27c7d to 44192ec Compare October 21, 2025 20:34

RemcoSmitsDev and others added 2 commits October 21, 2025 22:52

Merge branch 'main' into markdown-support-col-span

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Co-authored-by: Anthony Eid <hello@anthonyeid.me>

clean up

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RemcoSmitsDev marked this pull request as ready for review October 21, 2025 21:08

Anthony-Eid merged commit d558005 into zed-industries:main Oct 22, 2025
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RemcoSmitsDev mentioned this pull request Oct 24, 2025

markdown: Fix HTML tables with mismatching columns #41108

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RemcoSmitsDev deleted the markdown-support-col-span branch October 25, 2025 19:16

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markdown: Add support for `colspan` and `rowspan` for HTML tables #39898

markdown: Add support for `colspan` and `rowspan` for HTML tables #39898

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RemcoSmitsDev commented Oct 9, 2025 •

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markdown: Add support for colspan and rowspan for HTML tables #39898

markdown: Add support for colspan and rowspan for HTML tables #39898

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markdown: Add support for `colspan` and `rowspan` for HTML tables #39898

markdown: Add support for `colspan` and `rowspan` for HTML tables #39898

RemcoSmitsDev commented Oct 9, 2025 •

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