diff --git a/package-lock.json b/package-lock.json
index 5e55efd2a..b42387a54 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,6 +5,7 @@
   "packages": {
     "": {
       "dependencies": {
+        "@joplin/turndown-plugin-gfm": "^1.0.43",
         "@types/voca": "^1.4.1",
         "evernote": "^2.0.5",
         "html-entities": "^2.3.2",
@@ -139,6 +140,11 @@
       "integrity": "sha512-ZnQMnLV4e7hDlUvw8H+U8ASL02SS2Gn6+9Ac3wGGLIe7+je2AeAOxPY+izIPJDfFDb7eDjev0Us8MO1iFRN8hA==",
       "dev": true
     },
+    "node_modules/@joplin/turndown-plugin-gfm": {
+      "version": "1.0.43",
+      "resolved": "https://registry.npmjs.org/@joplin/turndown-plugin-gfm/-/turndown-plugin-gfm-1.0.43.tgz",
+      "integrity": "sha512-d0Qji9JT8vyCjPMfWCPgOCOA9naJlY9Yihumi2n3+FEnVJuu55gTpJzUNzA0TY5f1EDTbHtQYiFM56vkisjwgw=="
+    },
     "node_modules/@nodelib/fs.scandir": {
       "version": "2.1.5",
       "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz",
@@ -5906,6 +5912,11 @@
       "integrity": "sha512-ZnQMnLV4e7hDlUvw8H+U8ASL02SS2Gn6+9Ac3wGGLIe7+je2AeAOxPY+izIPJDfFDb7eDjev0Us8MO1iFRN8hA==",
       "dev": true
     },
+    "@joplin/turndown-plugin-gfm": {
+      "version": "1.0.43",
+      "resolved": "https://registry.npmjs.org/@joplin/turndown-plugin-gfm/-/turndown-plugin-gfm-1.0.43.tgz",
+      "integrity": "sha512-d0Qji9JT8vyCjPMfWCPgOCOA9naJlY9Yihumi2n3+FEnVJuu55gTpJzUNzA0TY5f1EDTbHtQYiFM56vkisjwgw=="
+    },
     "@nodelib/fs.scandir": {
       "version": "2.1.5",
       "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz",
diff --git a/package.json b/package.json
index b5389ae8f..4fc089950 100644
--- a/package.json
+++ b/package.json
@@ -9,6 +9,7 @@
     "uglify-js": "^3.14.2"
   },
   "dependencies": {
+    "@joplin/turndown-plugin-gfm": "^1.0.43",
     "@types/voca": "^1.4.1",
     "evernote": "^2.0.5",
     "html-entities": "^2.3.2",
diff --git a/source-contrib/CopyAsMarkdown-TablesTest.popclipext/>md.png b/source-contrib/CopyAsMarkdown-TablesTest.popclipext/>md.png
new file mode 100644
index 000000000..b003792d9
Binary files /dev/null and b/source-contrib/CopyAsMarkdown-TablesTest.popclipext/>md.png differ
diff --git a/source-contrib/CopyAsMarkdown-TablesTest.popclipext/@joplin+turndown-plugin-gfm.js b/source-contrib/CopyAsMarkdown-TablesTest.popclipext/@joplin+turndown-plugin-gfm.js
new file mode 100644
index 000000000..104ecf826
--- /dev/null
+++ b/source-contrib/CopyAsMarkdown-TablesTest.popclipext/@joplin+turndown-plugin-gfm.js
@@ -0,0 +1,243 @@
+(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.joplinturndownPluginGfm = f()}})(function(){var define,module,exports;return (function(){function r(e,n,t){function o(i,f){if(!n[i]){if(!e[i]){var c="function"==typeof require&&require;if(!f&&c)return c(i,!0);if(u)return u(i,!0);var a=new Error("Cannot find module '"+i+"'");throw a.code="MODULE_NOT_FOUND",a}var p=n[i]={exports:{}};e[i][0].call(p.exports,function(r){var n=e[i][1][r];return o(n||r)},p,p.exports,r,e,n,t)}return n[i].exports}for(var u="function"==typeof require&&require,i=0;i<t.length;i++)o(t[i]);return o}return r})()({1:[function(require,module,exports){
+'use strict';
+
+Object.defineProperty(exports, '__esModule', { value: true });
+
+var highlightRegExp = /highlight-(?:text|source)-([a-z0-9]+)/;
+
+function highlightedCodeBlock (turndownService) {
+  turndownService.addRule('highlightedCodeBlock', {
+    filter: function (node) {
+      var firstChild = node.firstChild;
+      return (
+        node.nodeName === 'DIV' &&
+        highlightRegExp.test(node.className) &&
+        firstChild &&
+        firstChild.nodeName === 'PRE'
+      )
+    },
+    replacement: function (content, node, options) {
+      var className = node.className || '';
+      var language = (className.match(highlightRegExp) || [null, ''])[1];
+
+      return (
+        '\n\n' + options.fence + language + '\n' +
+        node.firstChild.textContent +
+        '\n' + options.fence + '\n\n'
+      )
+    }
+  });
+}
+
+function strikethrough (turndownService) {
+  turndownService.addRule('strikethrough', {
+    filter: ['del', 's', 'strike'],
+    replacement: function (content) {
+      return '~~' + content + '~~'
+    }
+  });
+}
+
+var indexOf = Array.prototype.indexOf;
+var every = Array.prototype.every;
+var rules = {};
+
+rules.tableCell = {
+  filter: ['th', 'td'],
+  replacement: function (content, node) {
+    if (tableShouldBeSkipped(nodeParentTable(node))) return content;
+    return cell(content, node)
+  }
+};
+
+rules.tableRow = {
+  filter: 'tr',
+  replacement: function (content, node) {
+    const parentTable = nodeParentTable(node);
+    if (tableShouldBeSkipped(parentTable)) return content;
+
+    var borderCells = '';
+    var alignMap = { left: ':--', right: '--:', center: ':-:' };
+
+    if (isHeadingRow(node)) {
+      const colCount = tableColCount(parentTable);
+      for (var i = 0; i < colCount; i++) {
+        const childNode = colCount >= node.childNodes.length ? null : node.childNodes[i];
+        var border = '---';
+        var align = childNode ? (childNode.getAttribute('align') || '').toLowerCase() : '';
+
+        if (align) border = alignMap[align] || border;
+
+        if (childNode) {
+          borderCells += cell(border, node.childNodes[i]);
+        } else {
+          borderCells += cell(border, null, i);
+        }
+      }
+    }
+    return '\n' + content + (borderCells ? '\n' + borderCells : '')
+  }
+};
+
+rules.table = {
+  // Only convert tables with a heading row.
+  // Tables with no heading row are kept using `keep` (see below).
+  filter: function (node) {
+    return node.nodeName === 'TABLE'
+  },
+
+  replacement: function (content, node) {
+    if (tableShouldBeSkipped(node)) return content;
+
+    // Ensure there are no blank lines
+    content = content.replace(/\n+/g, '\n');
+
+    // If table has no heading, add an empty one so as to get a valid Markdown table
+    var secondLine = content.trim().split('\n');
+    if (secondLine.length >= 2) secondLine = secondLine[1];
+    var secondLineIsDivider = secondLine.indexOf('| ---') === 0;
+    
+    var columnCount = tableColCount(node);
+    var emptyHeader = '';
+    if (columnCount && !secondLineIsDivider) {
+      emptyHeader = '|' + '     |'.repeat(columnCount) + '\n' + '|' + ' --- |'.repeat(columnCount);
+    }
+
+    return '\n\n' + emptyHeader + content + '\n\n'
+  }
+};
+
+rules.tableSection = {
+  filter: ['thead', 'tbody', 'tfoot'],
+  replacement: function (content) {
+    return content
+  }
+};
+
+// A tr is a heading row if:
+// - the parent is a THEAD
+// - or if its the first child of the TABLE or the first TBODY (possibly
+//   following a blank THEAD)
+// - and every cell is a TH
+function isHeadingRow (tr) {
+  var parentNode = tr.parentNode;
+  return (
+    parentNode.nodeName === 'THEAD' ||
+    (
+      parentNode.firstChild === tr &&
+      (parentNode.nodeName === 'TABLE' || isFirstTbody(parentNode)) &&
+      every.call(tr.childNodes, function (n) { return n.nodeName === 'TH' })
+    )
+  )
+}
+
+function isFirstTbody (element) {
+  var previousSibling = element.previousSibling;
+  return (
+    element.nodeName === 'TBODY' && (
+      !previousSibling ||
+      (
+        previousSibling.nodeName === 'THEAD' &&
+        /^\s*$/i.test(previousSibling.textContent)
+      )
+    )
+  )
+}
+
+function cell (content, node = null, index = null) {
+  if (index === null) index = indexOf.call(node.parentNode.childNodes, node);
+  var prefix = ' ';
+  if (index === 0) prefix = '| ';
+  let filteredContent = content.trim().replace(/\n\r/g, '<br>').replace(/\n/g, "<br>");
+  filteredContent = filteredContent.replace(/\|+/g, '\\|');
+  while (filteredContent.length < 3) filteredContent += ' ';
+  if (node) filteredContent = handleColSpan(filteredContent, node, ' ');
+  return prefix + filteredContent + ' |'
+}
+
+function nodeContainsTable(node) {
+  if (!node.childNodes) return false;
+
+  for (let i = 0; i < node.childNodes.length; i++) {
+    const child = node.childNodes[i];
+    if (child.nodeName === 'TABLE') return true;
+    if (nodeContainsTable(child)) return true;
+  }
+  return false;
+}
+
+// Various conditions under which a table should be skipped - i.e. each cell
+// will be rendered one after the other as if they were paragraphs.
+function tableShouldBeSkipped(tableNode) {
+  if (!tableNode) return true;
+  if (!tableNode.rows) return true;
+  if (tableNode.rows.length === 1 && tableNode.rows[0].childNodes.length <= 1) return true; // Table with only one cell
+  if (nodeContainsTable(tableNode)) return true;
+  return false;
+}
+
+function nodeParentTable(node) {
+  let parent = node.parentNode;
+  while (parent.nodeName !== 'TABLE') {
+    parent = parent.parentNode;
+    if (!parent) return null;
+  }
+  return parent;
+}
+
+function handleColSpan(content, node, emptyChar) {
+  const colspan = node.getAttribute('colspan') || 1;
+  for (let i = 1; i < colspan; i++) {
+    content += ' | ' + emptyChar.repeat(3);
+  }
+  return content
+}
+
+function tableColCount(node) {
+  let maxColCount = 0;
+  for (let i = 0; i < node.rows.length; i++) {
+    const row = node.rows[i];
+    const colCount = row.childNodes.length;
+    if (colCount > maxColCount) maxColCount = colCount;
+  }
+  return maxColCount
+}
+
+function tables (turndownService) {
+  turndownService.keep(function (node) {
+    return node.nodeName === 'TABLE'
+  });
+  for (var key in rules) turndownService.addRule(key, rules[key]);
+}
+
+function taskListItems (turndownService) {
+  turndownService.addRule('taskListItems', {
+    filter: function (node) {
+      return node.type === 'checkbox' && node.parentNode.nodeName === 'LI'
+    },
+    replacement: function (content, node) {
+      return (node.checked ? '[x]' : '[ ]') + ' '
+    }
+  });
+}
+
+function gfm (turndownService) {
+  turndownService.use([
+    highlightedCodeBlock,
+    strikethrough,
+    tables,
+    taskListItems
+  ]);
+}
+
+exports.gfm = gfm;
+exports.highlightedCodeBlock = highlightedCodeBlock;
+exports.strikethrough = strikethrough;
+exports.tables = tables;
+exports.taskListItems = taskListItems;
+
+},{}],2:[function(require,module,exports){
+module.exports=require("@joplin/turndown-plugin-gfm")
+
+},{"@joplin/turndown-plugin-gfm":1}]},{},[2])(2)
+});
diff --git a/source-contrib/CopyAsMarkdown-TablesTest.popclipext/Config.json b/source-contrib/CopyAsMarkdown-TablesTest.popclipext/Config.json
new file mode 100644
index 000000000..bc2bd421c
--- /dev/null
+++ b/source-contrib/CopyAsMarkdown-TablesTest.popclipext/Config.json
@@ -0,0 +1,12 @@
+{
+  "popclip version": 3785,
+  "identifier": "com.pilotmoon.popclip.extension.copy-as-markdown",
+  "name": "Copy as Markdown",
+  "icon": ">md.png",
+  "capture html": true,
+  "module": "copy-as-markdown.js",
+  "after": "copy-result",
+  "long name": "Copy as Markdown",
+  "description": "Copy web content as Markdown.",
+  "note": "Updated 3 Feb 2022 for compatibility with macOS 12.3."
+}
diff --git a/source-contrib/CopyAsMarkdown-TablesTest.popclipext/CopyAsMarkdown-demo.gif b/source-contrib/CopyAsMarkdown-TablesTest.popclipext/CopyAsMarkdown-demo.gif
new file mode 100644
index 000000000..5cad31003
Binary files /dev/null and b/source-contrib/CopyAsMarkdown-TablesTest.popclipext/CopyAsMarkdown-demo.gif differ
diff --git a/source-contrib/CopyAsMarkdown-TablesTest.popclipext/CopyAsMarkdown-demo.mp4 b/source-contrib/CopyAsMarkdown-TablesTest.popclipext/CopyAsMarkdown-demo.mp4
new file mode 100644
index 000000000..417fcb90d
Binary files /dev/null and b/source-contrib/CopyAsMarkdown-TablesTest.popclipext/CopyAsMarkdown-demo.mp4 differ
diff --git a/source-contrib/CopyAsMarkdown-TablesTest.popclipext/README.md b/source-contrib/CopyAsMarkdown-TablesTest.popclipext/README.md
new file mode 100644
index 000000000..2149a3b32
--- /dev/null
+++ b/source-contrib/CopyAsMarkdown-TablesTest.popclipext/README.md
@@ -0,0 +1,12 @@
+# Copy as Markdown — Tables Test
+
+And attempt at integrating @joplin/turndown-plugin-jfm into turndown
+in order to get Markdown tables.
+
+So far it seems that perhaps linkedom (which we use instead of jsdom)
+does not produce the required output. Specificaly the table node has no
+rows property.
+
+So it doesn't work.
+
+Nick, 2 May 2022
diff --git a/source-contrib/CopyAsMarkdown-TablesTest.popclipext/copy-as-markdown.js b/source-contrib/CopyAsMarkdown-TablesTest.popclipext/copy-as-markdown.js
new file mode 100644
index 000000000..393fd0121
--- /dev/null
+++ b/source-contrib/CopyAsMarkdown-TablesTest.popclipext/copy-as-markdown.js
@@ -0,0 +1,20 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.action = exports.htmlToMarkdown = void 0;
+const linkedom = require("@popclip/linkedom");
+const TurndownService = require("@popclip/turndown");
+const turndownPluginGfm = require("./@joplin+turndown-plugin-gfm");
+function htmlToMarkdown(html) {
+    // generate DOM object from HTML
+    function JSDOM(html) { return linkedom.parseHTML(html); } // facade to work like jsdom
+    const { document } = new JSDOM(html);
+    const options = { headingStyle: 'atx' };
+    var turndownService = new TurndownService(options);
+    turndownService.use(turndownPluginGfm.gfm);
+    return turndownService.turndown(document);
+}
+exports.htmlToMarkdown = htmlToMarkdown;
+const action = (input) => {
+    return htmlToMarkdown(input.html);
+};
+exports.action = action;
diff --git a/source-contrib/CopyAsMarkdown-TablesTest.popclipext/copy-as-markdown.ts b/source-contrib/CopyAsMarkdown-TablesTest.popclipext/copy-as-markdown.ts
new file mode 100644
index 000000000..ff9fd862a
--- /dev/null
+++ b/source-contrib/CopyAsMarkdown-TablesTest.popclipext/copy-as-markdown.ts
@@ -0,0 +1,17 @@
+import linkedom = require('@popclip/linkedom')
+import TurndownService = require('@popclip/turndown')
+import turndownPluginGfm = require('./@joplin+turndown-plugin-gfm')
+
+export function htmlToMarkdown (html: string): string {
+  // generate DOM object from HTML
+  function JSDOM (html): any { return linkedom.parseHTML(html) } // facade to work like jsdom
+  const { document } = new (JSDOM as any)(html)
+  const options = { headingStyle: 'atx' }
+  var turndownService = new TurndownService(options)
+  turndownService.use(turndownPluginGfm.gfm)
+  return turndownService.turndown(document)
+}
+
+export const action: Action = (input) => {
+  return htmlToMarkdown(input.html)
+}
diff --git a/source-contrib/CopyAsMarkdown-TablesTest.popclipext/test.js b/source-contrib/CopyAsMarkdown-TablesTest.popclipext/test.js
new file mode 100644
index 000000000..e9b2df38c
--- /dev/null
+++ b/source-contrib/CopyAsMarkdown-TablesTest.popclipext/test.js
@@ -0,0 +1,35 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+// run with /Applications/PopClip.app/Contents/MacOS/PopClip runjs test.js
+const copy_as_markdown_1 = require("./copy-as-markdown");
+print((0, copy_as_markdown_1.htmlToMarkdown)('<p>hello</p>'));
+print((0, copy_as_markdown_1.htmlToMarkdown)('<h1>head1</h1>'));
+print((0, copy_as_markdown_1.htmlToMarkdown)('<strike>strike</strike>'));
+const table = `
+<table>
+<thead>
+<tr>
+<th align="left">Option</th>
+<th align="left">Valid values</th>
+<th align="left">Default</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td align="left"><code>blankReplacement</code></td>
+<td align="left">rule replacement function</td>
+<td align="left">See <strong>Special Rules</strong> below</td>
+</tr>
+<tr>
+<td align="left"><code>keepReplacement</code></td>
+<td align="left">rule replacement function</td>
+<td align="left">See <strong>Special Rules</strong> below</td>
+</tr>
+<tr>
+<td align="left"><code>defaultReplacement</code></td>
+<td align="left">rule replacement function</td>
+<td align="left">See <strong>Special Rules</strong> below</td>
+</tr>
+</tbody>
+</table>`;
+print((0, copy_as_markdown_1.htmlToMarkdown)(table));
diff --git a/source-contrib/CopyAsMarkdown-TablesTest.popclipext/test.ts b/source-contrib/CopyAsMarkdown-TablesTest.popclipext/test.ts
new file mode 100644
index 000000000..fc831a659
--- /dev/null
+++ b/source-contrib/CopyAsMarkdown-TablesTest.popclipext/test.ts
@@ -0,0 +1,34 @@
+// run with /Applications/PopClip.app/Contents/MacOS/PopClip runjs test.js
+import { htmlToMarkdown } from './copy-as-markdown'
+print(htmlToMarkdown('<p>hello</p>'))
+print(htmlToMarkdown('<h1>head1</h1>'))
+print(htmlToMarkdown('<strike>strike</strike>'))
+
+const table = `
+<table>
+<thead>
+<tr>
+<th align="left">Option</th>
+<th align="left">Valid values</th>
+<th align="left">Default</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td align="left"><code>blankReplacement</code></td>
+<td align="left">rule replacement function</td>
+<td align="left">See <strong>Special Rules</strong> below</td>
+</tr>
+<tr>
+<td align="left"><code>keepReplacement</code></td>
+<td align="left">rule replacement function</td>
+<td align="left">See <strong>Special Rules</strong> below</td>
+</tr>
+<tr>
+<td align="left"><code>defaultReplacement</code></td>
+<td align="left">rule replacement function</td>
+<td align="left">See <strong>Special Rules</strong> below</td>
+</tr>
+</tbody>
+</table>`
+print(htmlToMarkdown(table))