diff --git a/package-lock.json b/package-lock.json
index 5b82e1e3c48..fd1402fa05b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5765,9 +5765,9 @@
       }
     },
     "node_modules/@docsearch/core": {
-      "version": "4.6.3",
-      "resolved": "https://registry.npmjs.org/@docsearch/core/-/core-4.6.3.tgz",
-      "integrity": "sha512-rUOujwIpxJRgD7+kicVsI3D5sqBvdiRTquzWBpTEXZs8ZXfGbfzpus5HqumaNYTppN2HvH8E2yNuRwYdHJeOlA==",
+      "version": "4.7.0",
+      "resolved": "https://registry.npmjs.org/@docsearch/core/-/core-4.7.0.tgz",
+      "integrity": "sha512-p/9xVKmPDj3FPvMfPf5naVO3Ej8SCbcUugGvx1+8GgkuBNbqxqN2Irx3WLBv8VY0jH7XpRwKWdlmjXLZsmTLsg==",
       "license": "MIT",
       "peerDependencies": {
         "@types/react": ">= 16.8.0 < 20.0.0",
@@ -5787,20 +5787,20 @@
       }
     },
     "node_modules/@docsearch/css": {
-      "version": "4.6.3",
-      "resolved": "https://registry.npmjs.org/@docsearch/css/-/css-4.6.3.tgz",
-      "integrity": "sha512-nlOwcXcsNAptQl4vlL4MA78qNJKO0Qlds5GuBjCoePgkebTXLSf8Qt1oyZ3YBshYupKXG9VRGEsk1zr23d+bzQ==",
+      "version": "4.7.0",
+      "resolved": "https://registry.npmjs.org/@docsearch/css/-/css-4.7.0.tgz",
+      "integrity": "sha512-Sk5xkdRFeE7PeWjG9l4AfTwdvMfr9wHiwNNCpHXT4v4SNyNMKdHGvEILc31BgaVFGDDNbv5u/a73tofRiwbEZw==",
       "license": "MIT"
     },
     "node_modules/@docsearch/react": {
-      "version": "4.6.3",
-      "resolved": "https://registry.npmjs.org/@docsearch/react/-/react-4.6.3.tgz",
-      "integrity": "sha512-Bg2wdDsoQVlNCcEKuEJAU04tvHCqgx8rIu+uIoM4pRtcx3TBKJuXutJik3LTA8LRc9YEyHkrYUrmcC0D7BYf+g==",
+      "version": "4.7.0",
+      "resolved": "https://registry.npmjs.org/@docsearch/react/-/react-4.7.0.tgz",
+      "integrity": "sha512-x6oedjJ8O8/pIDBsMo5Orca3/6cQCz616/CwthVe68l43mqnj2lrJ9kFQITBqy8hMsS3nWeBWFoVO5dJ1DCFKA==",
       "license": "MIT",
       "dependencies": {
         "@algolia/autocomplete-core": "1.19.2",
-        "@docsearch/core": "4.6.3",
-        "@docsearch/css": "4.6.3"
+        "@docsearch/core": "4.7.0",
+        "@docsearch/css": "4.7.0"
       },
       "peerDependencies": {
         "@types/react": ">= 16.8.0 < 20.0.0",
@@ -6727,9 +6727,9 @@
       }
     },
     "node_modules/@es-joy/jsdoccomment": {
-      "version": "0.90.0",
-      "resolved": "https://registry.npmjs.org/@es-joy/jsdoccomment/-/jsdoccomment-0.90.0.tgz",
-      "integrity": "sha512-51x9KxyTAN6guZOCd+lmcDdkhgdMdP/6iMMtg9dyhCWDc3+iSUyoB7f/9WAM/yGHmGFq25Vd6bXRR7CZcB+tog==",
+      "version": "0.91.0",
+      "resolved": "https://registry.npmjs.org/@es-joy/jsdoccomment/-/jsdoccomment-0.91.0.tgz",
+      "integrity": "sha512-vgqlMGNNhZxwDYbUNIHj3Hskb4R28iqdXx90ufHyt/NeuTQkeqjTDslAs9I0/GCAfbxP5BpH5WsL1R1fht5Lxg==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -6737,7 +6737,7 @@
         "@typescript-eslint/types": "^8.65.0",
         "comment-parser": "1.4.7",
         "esquery": "^1.7.0",
-        "jsdoc-type-pratt-parser": "~7.3.0"
+        "jsdoc-type-pratt-parser": "~8.0.0"
       },
       "engines": {
         "node": "^20.19.0 || ^22.13.0 || >=24"
@@ -8431,9 +8431,9 @@
       }
     },
     "node_modules/@npmcli/map-workspaces/node_modules/brace-expansion": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.1.2.tgz",
-      "integrity": "sha512-w5JZcKgdhDOgOwm8H+KgbosopHMuGcl6qbulwjtz3SM7I7P3yW1eAjzMPLrIE+NQ9vjgANKHWeMHnrT0OXW1oA==",
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.1.3.tgz",
+      "integrity": "sha512-DRdx5neNsG/QXbniLFWi2YmC/68oeOOmKz6zOjVk6ZS1ZLXgLIKqVEc6hWsmkjBbgii0SwaBTcJ5XKj5gzY/4A==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -11411,9 +11411,9 @@
       }
     },
     "node_modules/acorn": {
-      "version": "8.17.0",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.17.0.tgz",
-      "integrity": "sha512-xRQbDb9BnwDafYNn6Vwl839DYVjqXYb1XVGtWAZ1kcDc6iwAL4hg3B1dZlRiuENFeO2H53gFG3in621AdERVAg==",
+      "version": "8.18.0",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.18.0.tgz",
+      "integrity": "sha512-lGq+9yr1/GuAWaVYIHRjvvySG5/4VfKIvC8EWxStPdcDh/Ka7FG3twP6v4d5BkravUilhIAsG4Qj83t02LWUPQ==",
       "license": "MIT",
       "bin": {
         "acorn": "bin/acorn"
@@ -12331,9 +12331,9 @@
       "license": "MIT"
     },
     "node_modules/baseline-browser-mapping": {
-      "version": "2.11.5",
-      "resolved": "https://registry.npmjs.org/baseline-browser-mapping/-/baseline-browser-mapping-2.11.5.tgz",
-      "integrity": "sha512-xJo6a6YZnwZfnyGmQKWMbVOcii7XRibjOskRh+WJ9UHQoX16xrQrcIgAMQOzfvs8XiLMx6ih/fsLPF73iY2D1A==",
+      "version": "2.11.6",
+      "resolved": "https://registry.npmjs.org/baseline-browser-mapping/-/baseline-browser-mapping-2.11.6.tgz",
+      "integrity": "sha512-69D/imtToCsIcAl8WBS2YaRwA4jO/j0HhU+hELqMEu9f54MoUtI6+XH5mrKU8rEFNEk/Ui1I2MK4/JkWacclGw==",
       "license": "Apache-2.0",
       "bin": {
         "baseline-browser-mapping": "dist/cli.cjs"
@@ -12502,9 +12502,9 @@
       "license": "MIT"
     },
     "node_modules/bonjour-service": {
-      "version": "1.4.3",
-      "resolved": "https://registry.npmjs.org/bonjour-service/-/bonjour-service-1.4.3.tgz",
-      "integrity": "sha512-2Kd5UYlFUVgAKMTyuBLl6w49wqfOnbxHqmuH0oCl/n7TfAikR0zoowNOP5BU4dfXmm+Vr9JyEN370auSMx+CNg==",
+      "version": "1.4.4",
+      "resolved": "https://registry.npmjs.org/bonjour-service/-/bonjour-service-1.4.4.tgz",
+      "integrity": "sha512-jCZcVv7eoc4QesRscwEZtSROBen+6LpKAmBIsQYQrsAeVHLyMXWX/t6eIV5KiRZYNUBl8eVqImEEMQ8L5+c/Kw==",
       "license": "MIT",
       "dependencies": {
         "fast-deep-equal": "^3.1.3",
@@ -15173,9 +15173,9 @@
       "license": "MIT"
     },
     "node_modules/electron-to-chromium": {
-      "version": "1.5.396",
-      "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.5.396.tgz",
-      "integrity": "sha512-yHiw2Y3C3H9U6TMbOfoWK/BPreiOPXRfTWPBwQBoZG6/8TB6eOPnsy5oaRYuatR7Fw2SJ4kKforgufeo7fq0EQ==",
+      "version": "1.5.397",
+      "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.5.397.tgz",
+      "integrity": "sha512-khGTy9U9x02KEtsKM8vx5A62BsRmcOsIgDpWr1ImE32Ax8GxHGPHZf+Eu9H8zOOyHJnB0jTbseyTHbq2XCT8yw==",
       "license": "ISC"
     },
     "node_modules/emoji-regex": {
@@ -15229,9 +15229,9 @@
       }
     },
     "node_modules/enhanced-resolve": {
-      "version": "5.24.3",
-      "resolved": "https://registry.npmjs.org/enhanced-resolve/-/enhanced-resolve-5.24.3.tgz",
-      "integrity": "sha512-PwKooW9JUzh5chmYfHM3IQl5OkK2u2Nm011MgeZrss3JmFraUx/fqrf78kk8GUMYoibx/14MdwTl/1WKkG7TpQ==",
+      "version": "5.24.4",
+      "resolved": "https://registry.npmjs.org/enhanced-resolve/-/enhanced-resolve-5.24.4.tgz",
+      "integrity": "sha512-GVoi+ICHocoOIU7qVVM48wOJziRsqrsyqlI0Ce0LdowRn6v3bcH2zUa9kp85ncx0nwIb9/HOCOLS3fdThDG/XQ==",
       "license": "MIT",
       "dependencies": {
         "graceful-fs": "^4.2.4",
@@ -15625,13 +15625,13 @@
       }
     },
     "node_modules/eslint-plugin-jsdoc": {
-      "version": "63.3.1",
-      "resolved": "https://registry.npmjs.org/eslint-plugin-jsdoc/-/eslint-plugin-jsdoc-63.3.1.tgz",
-      "integrity": "sha512-yVyTPtOY2tA8EjTwUtaM3pFxj9i/3m4/FSPMv5gMnDHSSleCpzIYQLyV8KnVmEIkkPpNhDlkDQ99mTfjxgqLxA==",
+      "version": "63.3.2",
+      "resolved": "https://registry.npmjs.org/eslint-plugin-jsdoc/-/eslint-plugin-jsdoc-63.3.2.tgz",
+      "integrity": "sha512-5B3oO23iqbNJC/ru7uqIY80wmY66De1Q0+5kXQGHuLrGze/rL0Zw/YktMcqgYQ+kdHmgvY1q5TpRgl3yZMLmhQ==",
       "dev": true,
       "license": "BSD-3-Clause",
       "dependencies": {
-        "@es-joy/jsdoccomment": "~0.90.0",
+        "@es-joy/jsdoccomment": "~0.91.0",
         "@es-joy/resolve.exports": "1.2.0",
         "are-docs-informative": "^0.0.2",
         "comment-parser": "1.4.7",
@@ -17433,9 +17433,9 @@
       }
     },
     "node_modules/glob/node_modules/brace-expansion": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.1.2.tgz",
-      "integrity": "sha512-w5JZcKgdhDOgOwm8H+KgbosopHMuGcl6qbulwjtz3SM7I7P3yW1eAjzMPLrIE+NQ9vjgANKHWeMHnrT0OXW1oA==",
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.1.3.tgz",
+      "integrity": "sha512-DRdx5neNsG/QXbniLFWi2YmC/68oeOOmKz6zOjVk6ZS1ZLXgLIKqVEc6hWsmkjBbgii0SwaBTcJ5XKj5gzY/4A==",
       "license": "MIT",
       "dependencies": {
         "balanced-match": "^1.0.0"
@@ -19693,9 +19693,9 @@
       }
     },
     "node_modules/jsdoc-type-pratt-parser": {
-      "version": "7.3.0",
-      "resolved": "https://registry.npmjs.org/jsdoc-type-pratt-parser/-/jsdoc-type-pratt-parser-7.3.0.tgz",
-      "integrity": "sha512-DoyJXo7x/n48M3NsGOs9QnEws0ft0tV3YsSgvWMNxz2hZtz+Q6fpqUD96lVYX4a+jcEkzHeFNDJOn68TzXfbdA==",
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/jsdoc-type-pratt-parser/-/jsdoc-type-pratt-parser-8.0.0.tgz",
+      "integrity": "sha512-uQu/fXVqVaMg6gM8/E5G5+eygVcZ1NV0Z51CvqhNa2bDWxvHMl484ETr6vph4oPyC+KUcbP/w2W2pewfCiR9aQ==",
       "dev": true,
       "license": "MIT",
       "engines": {
@@ -23207,9 +23207,9 @@
       }
     },
     "node_modules/mocha/node_modules/brace-expansion": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.1.2.tgz",
-      "integrity": "sha512-w5JZcKgdhDOgOwm8H+KgbosopHMuGcl6qbulwjtz3SM7I7P3yW1eAjzMPLrIE+NQ9vjgANKHWeMHnrT0OXW1oA==",
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.1.3.tgz",
+      "integrity": "sha512-DRdx5neNsG/QXbniLFWi2YmC/68oeOOmKz6zOjVk6ZS1ZLXgLIKqVEc6hWsmkjBbgii0SwaBTcJ5XKj5gzY/4A==",
       "license": "MIT",
       "dependencies": {
         "balanced-match": "^1.0.0"
@@ -24675,9 +24675,9 @@
       }
     },
     "node_modules/postcss": {
-      "version": "8.5.23",
-      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.23.tgz",
-      "integrity": "sha512-g50586zr4bZmwFiTlflMu8E0bDTb5I5gertgwAKmsdUlTQIhZtunzUlD1WSzwcVWPoAVpsrA6vlfCD7oXvRwgg==",
+      "version": "8.5.24",
+      "resolved": "https://registry.npmjs.org/postcss/-/postcss-8.5.24.tgz",
+      "integrity": "sha512-8RyVklq0owXUTa4xlpzu4l9AaVKIdQvAcOHZWaMh98HgySsUtxRVf/chRe3dsSLqb6i40BzGRzEUddRaI+9TSw==",
       "funding": [
         {
           "type": "opencollective",
@@ -27115,9 +27115,9 @@
       }
     },
     "node_modules/readdir-glob/node_modules/brace-expansion": {
-      "version": "2.1.2",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.1.2.tgz",
-      "integrity": "sha512-w5JZcKgdhDOgOwm8H+KgbosopHMuGcl6qbulwjtz3SM7I7P3yW1eAjzMPLrIE+NQ9vjgANKHWeMHnrT0OXW1oA==",
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-2.1.3.tgz",
+      "integrity": "sha512-DRdx5neNsG/QXbniLFWi2YmC/68oeOOmKz6zOjVk6ZS1ZLXgLIKqVEc6hWsmkjBbgii0SwaBTcJ5XKj5gzY/4A==",
       "dev": true,
       "license": "MIT",
       "dependencies": {
@@ -31308,9 +31308,9 @@
       }
     },
     "node_modules/webpack": {
-      "version": "5.109.1",
-      "resolved": "https://registry.npmjs.org/webpack/-/webpack-5.109.1.tgz",
-      "integrity": "sha512-Q4XQscWSLNQSaMFsIWUZ+IVpvwLqD+MvjIuSQC1hG8m1ZMK78VAsNMhTjD3icJelypp6aM5Hq8BZNEX3sc1PJw==",
+      "version": "5.109.2",
+      "resolved": "https://registry.npmjs.org/webpack/-/webpack-5.109.2.tgz",
+      "integrity": "sha512-U9/cvLzxObKNEZ9+TtdqrHM5/9z3lgl2c+c4BzbqGxFQvQvBAq87yql5A8pQ+rrMbS496MZJeF5enVBndIy2hw==",
       "license": "MIT",
       "dependencies": {
         "@types/estree": "^1.0.8",
@@ -31321,7 +31321,7 @@
         "acorn": "^8.16.0",
         "browserslist": "^4.28.1",
         "chrome-trace-event": "^1.0.2",
-        "enhanced-resolve": "^5.24.2",
+        "enhanced-resolve": "^5.24.4",
         "es-module-lexer": "^2.1.0",
         "eslint-scope": "5.1.1",
         "events": "^3.2.0",
@@ -31407,9 +31407,9 @@
       }
     },
     "node_modules/webpack-cli": {
-      "version": "7.2.1",
-      "resolved": "https://registry.npmjs.org/webpack-cli/-/webpack-cli-7.2.1.tgz",
-      "integrity": "sha512-YwSGbcZdfz12DM8JIseVPr3oBb09IgVCVc4vY3oDvZnI/mALTGPAP1QiqOi4/bBLSJrRHaqDIXeHcNA0+G38aw==",
+      "version": "7.2.2",
+      "resolved": "https://registry.npmjs.org/webpack-cli/-/webpack-cli-7.2.2.tgz",
+      "integrity": "sha512-lD0pALneslq8FfV+rwvm1BMW0AFAJrHHhNupAGN4asYjMvqrtRsenU4iKpiBo09gS4ntMxKGUxl9jhTEzVt0oA==",
       "license": "MIT",
       "dependencies": {
         "@discoveryjs/json-ext": "^1.1.0",
@@ -32320,8 +32320,6 @@
       "license": "Apache-2.0",
       "devDependencies": {
         "@blockly/block-test": "^13.1.0",
-        "@blockly/dev-tools": "^13.1.0",
-        "@blockly/theme-modern": "^13.1.0",
         "@hyperjump/browser": "^1.3.1",
         "@hyperjump/json-schema": "^1.17.6",
         "@microsoft/api-documenter": "7.30.7",
diff --git a/packages/blockly/package.json b/packages/blockly/package.json
index 02231921b2e..7018ad0bd21 100644
--- a/packages/blockly/package.json
+++ b/packages/blockly/package.json
@@ -38,7 +38,7 @@
     "prepareDemos": "gulp prepareDemos",
     "publish": "npm ci && gulp publish",
     "publish:beta": "npm ci && gulp publishBeta",
-    "start": "node ./tests/scripts/magic_symlink.js && npm run build && concurrently -n tsc,server \"tsc --watch --preserveWatchOutput --outDir \"build/src\" --declarationDir \"build/declarations\"\" \"http-server ./ -s -o /tests/playground.html -c-1\"",
+    "start": "npm run build && concurrently -n tsc,server \"tsc --watch --preserveWatchOutput --outDir \"build/src\" --declarationDir \"build/declarations\"\" \"http-server ./ -s -o /tests/playground.html -c-1\"",
     "tsc": "gulp tsc",
     "test": "gulp test",
     "test:browser": "npx mocha --config tests/browser/.mocharc.js",
@@ -100,8 +100,6 @@
   "license": "Apache-2.0",
   "devDependencies": {
     "@blockly/block-test": "^13.1.0",
-    "@blockly/dev-tools": "^13.1.0",
-    "@blockly/theme-modern": "^13.1.0",
     "@hyperjump/browser": "^1.3.1",
     "@hyperjump/json-schema": "^1.17.6",
     "@microsoft/api-documenter": "7.30.7",
diff --git a/packages/blockly/tests/playground.html b/packages/blockly/tests/playground.html
index 31dbf764877..df451996dc2 100644
--- a/packages/blockly/tests/playground.html
+++ b/packages/blockly/tests/playground.html
@@ -17,7 +17,6 @@
 
       await loadScript('../build/msg/en.js');
       await loadScript('playgrounds/screenshot.js');
-      await loadScript('../node_modules/@blockly/dev-tools/dist/index.js');
 
       var workspace = null;
 
@@ -535,8 +534,7 @@ <h1>Blockly Playground (<span id="version"></span>)</h1>
 
     <p>
       <input id="show" type="button" value="Show" /> -
-      <input id="hide" type="button" value="Hide" /> -
-      <a href="playgrounds/advanced_playground.html">Advanced</a>
+      <input id="hide" type="button" value="Hide" />
     </p>
 
     <form id="options">
diff --git a/packages/blockly/tests/playgrounds/advanced_playground.html b/packages/blockly/tests/playgrounds/advanced_playground.html
deleted file mode 100644
index afe59a1b78c..00000000000
--- a/packages/blockly/tests/playgrounds/advanced_playground.html
+++ /dev/null
@@ -1,160 +0,0 @@
-<!doctype html>
-<html>
-  <head>
-    <meta charset="utf-8" />
-    <title>Advanced Blockly Playground</title>
-
-    <script type="module">
-      import {loadScript} from '../scripts/load.mjs';
-
-      import * as Blockly from '../../build/blockly.loader.mjs';
-      import '../../build/blocks.loader.mjs';
-      // Generators not needed (but see also bug #6597).
-
-      await loadScript('../../build/msg/en.js');
-      await loadScript('screenshot.js');
-      await loadScript('../themes/test_themes.js');
-      await loadScript('../../node_modules/@blockly/dev-tools/dist/index.js');
-      await loadScript(
-        '../../node_modules/@blockly/theme-modern/dist/index.js',
-      );
-
-      let kbNavigation;
-
-      function start() {
-        setBackgroundColour();
-        initPlayground();
-      }
-
-      function createWorkspace(blocklyDiv, options) {
-        var workspace = Blockly.inject(blocklyDiv, options);
-        return workspace;
-      }
-
-      function configurePlayground(playground) {
-        // Rendering options.
-        var gui = playground.getGUI();
-        var renderingFolder = gui.addFolder('Rendering');
-        var renderingOptions = {
-          'font Size': 10,
-        };
-        renderingFolder
-          .add(renderingOptions, 'font Size', 0, 50)
-          .onChange(function (value) {
-            var ws = playground.getWorkspace();
-            var fontStyle = {
-              'size': value,
-            };
-            ws.getTheme().setFontStyle(fontStyle);
-            // Refresh theme.
-            ws.setTheme(ws.getTheme());
-          });
-      }
-
-      function initPlayground() {
-        if (typeof window.createPlayground === 'undefined') {
-          alert(
-            "You need to run 'npm install' in order to use this playground.",
-          );
-          return;
-        }
-        var defaultOptions = {
-          comments: true,
-          collapse: true,
-          disable: true,
-          grid: {
-            spacing: 25,
-            length: 3,
-            colour: '#ccc',
-            snap: true,
-          },
-          horizontalLayout: false,
-          maxBlocks: Infinity,
-          maxInstances: {'test_basic_limit_instances': 3},
-          maxTrashcanContents: 256,
-          media: '../../media/',
-          oneBasedIndex: true,
-          readOnly: false,
-          rtl: false,
-          move: {
-            scrollbars: true,
-            drag: true,
-            wheel: false,
-          },
-          toolbox: toolboxCategories,
-          toolboxPosition: 'start',
-          zoom: {
-            controls: true,
-            wheel: true,
-            startScale: 1.0,
-            maxScale: 4,
-            minScale: 0.25,
-            scaleSpeed: 1.1,
-          },
-        };
-
-        const playgroundConfig = {
-          toolboxes: {
-            'categories': toolboxCategories,
-            'simple': toolboxSimple,
-            'test blocks': toolboxTestBlocks,
-          },
-        };
-
-        Blockly.ContextMenuItems.registerCommentOptions();
-
-        createPlayground(
-          document.getElementById('root'),
-          createWorkspace,
-          defaultOptions,
-          playgroundConfig,
-          'https://cdnjs.cloudflare.com/ajax/libs/monaco-editor/0.19.2/min/vs',
-        ).then(function (playground) {
-          configurePlayground(playground);
-        });
-      }
-
-      function setBackgroundColour() {
-        // Set background colour to differentiate file: vs. localhost
-        // vs. server copy.
-        if (location.protocol == 'file:') {
-          document.body.style.backgroundColor = '#89A203'; // Unpleasant green.
-        } else if (
-          location.hostname === 'localhost' ||
-          location.hostname === '127.0.0.1' ||
-          location.hostname === '[::1]'
-        ) {
-          document.body.style.backgroundColor = '#d6d6ff'; // Familliar lilac.
-        }
-      }
-      start();
-    </script>
-
-    <style>
-      html,
-      body {
-        margin: 0;
-      }
-
-      .ioLabel > .blocklyFlyoutLabelText {
-        font-style: italic;
-      }
-
-      .playgroundToggleOptions {
-        list-style: none;
-        padding: 0;
-      }
-      .playgroundToggleOptions li {
-        margin-top: 1em;
-      }
-
-      .zelos-renderer .blocklyFlyoutButton .blocklyText {
-        font-size: 1.5rem;
-      }
-    </style>
-  </head>
-  <body>
-    <div id="shortcuts"></div>
-    <div id="root"></div>
-  </body>
-</html>
diff --git a/packages/blockly/tests/scripts/magic_symlink.js b/packages/blockly/tests/scripts/magic_symlink.js
deleted file mode 100644
index 1ee3294144c..00000000000
--- a/packages/blockly/tests/scripts/magic_symlink.js
+++ /dev/null
@@ -1,26 +0,0 @@
-const path = require('path');
-const fs = require('fs');
-
-/**
- * Ensure playground imports that use ../../node_modules/* continue to work
- * when npm hoists dependencies to the repository root node_modules dir
- */
-function ensureWorkspaceNodeModulesLinks() {
-  const workspaceNodeModules = path.resolve(__dirname, '../../node_modules');
-  const rootNodeModules = path.resolve(__dirname, '../../../../node_modules');
-  const packages = ['@blockly/dev-tools', '@blockly/theme-modern'];
-
-  for (const pkg of packages) {
-    const workspacePkgPath = path.join(workspaceNodeModules, pkg);
-    const rootPkgPath = path.join(rootNodeModules, pkg);
-
-    if (fs.existsSync(workspacePkgPath) || !fs.existsSync(rootPkgPath)) {
-      continue;
-    }
-
-    fs.mkdirSync(path.dirname(workspacePkgPath), {recursive: true});
-    fs.symlinkSync(rootPkgPath, workspacePkgPath, 'dir');
-  }
-}
-
-ensureWorkspaceNodeModulesLinks();