diff --git a/blockly_uncompressed.js b/blockly_uncompressed.js
deleted file mode 100644
index 804f97f0b..000000000
--- a/blockly_uncompressed.js
+++ /dev/null
@@ -1,58 +0,0 @@
-/**
- * @license
- * Copyright 2020 Google LLC
- * SPDX-License-Identifier: Apache-2.0
- */
-
-/**
- * @fileoverview Bootstrap code to load Blockly in uncompiled mode.
- */
-'use strict';
-
-
-/* eslint-disable no-var */
-
-/**
- * Blockly uncompiled-mode startup code.  If running in a browser
- * loads closure/goog/base.js and build/deps.js, then (in any case)
- * requires Blockly.requires.
- */
-(function(globalThis) {
-  /* eslint-disable-next-line no-undef */
-  var IS_NODE_JS = !!(typeof module !== 'undefined' && module.exports);
-
-  if (IS_NODE_JS) {
-    // Load Blockly.
-    goog.require('Blockly.requires');
-    /* eslint-disable no-undef */
-    module.exports = Blockly;
-  } else {
-    var BLOCKLY_DIR = '';
-    // Find name of current directory.
-    var scripts = document.getElementsByTagName('script');
-    var re = /(.+)[\\/]blockly_(?:.*)uncompressed\.js$/;
-    for (var script, i = 0; (script = scripts[i]); i++) {
-      var match = re.exec(script.src);
-      if (match) {
-        BLOCKLY_DIR = match[1];
-        break;
-      }
-    }
-    if (!BLOCKLY_DIR) {
-      alert('Could not detect Blockly\'s directory name.');
-    }
-    // Disable loading of closure/goog/deps.js (which doesn't exist).
-    globalThis.CLOSURE_NO_DEPS = true;
-    // Load Closure Library base.js (the only part of the libary we use,
-    // mainly for goog.require / goog.provide / goog.module).
-    document.write(
-        '<script src="' + BLOCKLY_DIR + '/closure/goog/base.js"></script>');
-    // Load dependency graph info from build/deps.js.  To update
-    // deps.js, run `npm run build:deps`.
-    document.write(
-        '<script src="' + BLOCKLY_DIR + '/build/deps.js"></script>');
-    // Load the rest of Blockly.
-    document.write('<script>goog.require(\'Blockly\');</script>');
-  }
-  /* eslint-disable-next-line no-invalid-this */
-})(this);
diff --git a/scripts/gulpfiles/build_tasks.js b/scripts/gulpfiles/build_tasks.js
index 9b6114bc5..1da8c3325 100644
--- a/scripts/gulpfiles/build_tasks.js
+++ b/scripts/gulpfiles/build_tasks.js
@@ -262,7 +262,7 @@ function buildJavaScript(done) {
 
 /**
  * This task updates DEPS_FILE (deps.js), used by
- * blockly_uncompressed.js when loading Blockly in uncompiled mode.
+ * bootstrap.js when loading Blockly in uncompiled mode.
  *
  * Also updates TEST_DEPS_FILE (deps.mocha.js), used by the mocha test
  * suite.
@@ -673,7 +673,6 @@ function buildAdvancedCompilationTest() {
  *     php_compressed.js
  *     lua_compressed.js
  *     dart_compressed.js
- *     blockly_uncompressed.js
  *     msg/json/*.js
  *     test/deps*.js
  */
diff --git a/scripts/gulpfiles/config.js b/scripts/gulpfiles/config.js
index af98fb579..02df80291 100644
--- a/scripts/gulpfiles/config.js
+++ b/scripts/gulpfiles/config.js
@@ -19,17 +19,16 @@ var path = require('path');
 // - tests/scripts/compile_typings.sh
 // - tests/scripts/check_metadata.sh
 // - tests/scripts/update_metadata.sh
-// - blockly_uncompressed.js (for location of deps.js)
 // - tests/bootstrap.js (for location of deps.js)
 // - tests/mocha/index.html (for location of deps.mocha.js)
 
 // Directory to write compiled output to.
 exports.BUILD_DIR = 'build';
 
-// Dependencies file (for blockly_uncompressed.js):
+// Dependencies file (used by bootstrap.js in uncompiled mode):
 exports.DEPS_FILE = path.join(exports.BUILD_DIR, 'deps.js');
 
-// Dependencies file (for blockly_uncompressed.js):
+// Mocha test dependencies file (used by tests/mocha/index.html):
 exports.TEST_DEPS_FILE = path.join(exports.BUILD_DIR, 'deps.mocha.js');
 
 // Directory to write typings output to.
diff --git a/tests/playground.html b/tests/playground.html
index e15ee7684..7b724bca3 100644
--- a/tests/playground.html
+++ b/tests/playground.html
@@ -4,9 +4,8 @@
 <meta charset="utf-8">
 <title>Blockly Playground</title>
 
-  <!-- This script loads uncompressed when on localhost and loads
-       compressed when it is being hosted.  Please add any other
-       dependencies to bootstrap.js. -->
+<!-- This script loads uncompressed when on localhost and loads
+     compressed when it is being hosted or on Internet Explorer.  -->
 <script>
   var BLOCKLY_BOOTSTRAP_OPTIONS = {
     additionalScripts: [
@@ -393,10 +392,6 @@ var spaghettiXml = [
     'next': { }
   });
 
-// Call start().  Because this <script> has type=module, it is
-// automatically deferred, so it will not be run until after the
-// document has been parsed, but before firing DOMContentLoaded.
-
 function addEventHandlers() {
   document.getElementById('save-json').addEventListener('click', saveJson);
   document.getElementById('save-xml').addEventListener('click', saveXml);
@@ -434,6 +429,9 @@ function addEventHandlers() {
       .addEventListener('click', function() { workspace.setVisible(false); });
 }
   
+// Call start().  Because this <script> has type=module, it is
+// automatically deferred, so it will not be run until after the
+// document has been parsed, but before firing DOMContentLoaded.
 start();
 
 </script>