jquery
diff --git a/.eslintrc-browser.json b/.eslintrc-browser.json
@@ -23,6 +23,10 @@
 
 	"rules": {
 		"one-var": [ "error", { "var": "always" } ],
-		"strict": [ "error", "function" ]
+		"strict": [ "error", "function" ],
+
+		// Support: IE <=9 only, Android <=4.0 only
+		// Allow square bracket notation for ES3 reserved words
+		"dot-notation": [ "error", { "allowKeywords": false } ]
 	}
 }
diff --git a/.eslintrc.json b/.eslintrc.json
@@ -1,5 +1,14 @@
 {
 	"root": true,
 
-	"extends": "./.eslintrc-node.json"
+	"extends": "./.eslintrc-node.json",
+
+	"overrides": [
+		{
+			"files": ["**/*.mjs"],
+			"parserOptions": {
+				"sourceType": "module"
+			}
+		}
+	]
 }
diff --git a/.github/workflows/node.js.yml b/.github/workflows/node.js.yml
@@ -0,0 +1,34 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        # Node.js 10 is required by jQuery infra
+        NODE_VERSION: [10.x, 16.x]
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: Cache
+      uses: actions/cache@v2
+      with:
+        path: ~/.npm
+        key: ${{ runner.os }}-node-${{ matrix.NODE_VERSION }}-npm-lock-${{ hashFiles('**/package-lock.json') }}
+        restore-keys: |
+          ${{ runner.os }}-node-${{ matrix.NODE_VERSION }}-npm-lock-
+
+    - name: Use Node.js ${{ matrix.NODE_VERSION }}
+      uses: actions/setup-node@v2.1.2
+      with:
+        node-version: ${{ matrix.NODE_VERSION }}
+
+    - name: Install npm dependencies
+      run: npm install
+
+    - name: Run test
+      run: npm run ci
diff --git a/.gitignore b/.gitignore
@@ -13,4 +13,5 @@ CDN
 /dist/*
 !/dist/.eslintrc.json
 
-node_modules
+/external
+/node_modules
diff --git a/.npmignore b/.npmignore
@@ -7,4 +7,5 @@ coverage
 *.patch
 /*.html
 .DS_Store
+external
 node_modules
diff --git a/.travis.yml b/.travis.yml
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -47,15 +47,15 @@ Make sure you have reproduced the bug with all browser extensions and add-ons di
 
 ### Try the latest version of jQuery
 
-Bugs in old versions of jQuery may have already been fixed. In order to avoid reporting known issues, make sure you are always testing against the [latest build](http://code.jquery.com/jquery.js).
+Bugs in old versions of jQuery may have already been fixed. In order to avoid reporting known issues, make sure you are always testing against the [latest jQuery version](https://releases.jquery.com/jquery/).
 
 ### Try an older version of jQuery
 
 Sometimes, bugs are introduced in newer versions of jQuery that do not exist in previous versions. When possible, it can be useful to try testing with an older release.
 
 ### Reduce, reduce, reduce!
 
-When you are experiencing a problem, the most useful thing you can possibly do is to [reduce your code](http://webkit.org/quality/reduction.html) to the bare minimum required to reproduce the issue. This makes it *much* easier to isolate and fix the offending code. Bugs that are reported without reduced test cases take on average 9001% longer to fix than bugs that are submitted with them, so you really should try to do this if at all possible.
+When you are experiencing a problem, the most useful thing you can possibly do is to [reduce your code](https://webkit.org/test-case-reduction/) to the bare minimum required to reproduce the issue. This makes it *much* easier to isolate and fix the offending code. Bugs that are reported without reduced test cases take on average 9001% longer to fix than bugs that are submitted with them, so you really should try to do this if at all possible.
 
 ## jQuery Core Style Guide
 
@@ -64,7 +64,7 @@ See: [jQuery Core Style Guide](http://docs.jquery.com/JQuery_Core_Style_Guidelin
 ## Tips For Bug Patching
 
 
-### Environment: localhost 
+### Environment: localhost
 
 To test the plugin you will need:
 
@@ -84,28 +84,28 @@ Change directory to your web root directory, whatever that might be:
 $ cd /path/to/your/www/root/
 ```
 
-Clone your plugin fork to work locally
+Clone your plugin fork to work locally:
 
 ```bash
 $ git clone git@github.com:username/jquery-migrate.git
 ```
 
-Change directory to the newly created dir jquery-migrate/
+Change directory to the newly created dir `jquery-migrate/`:
 
 ```bash
 $ cd jquery-migrate
 ```
 
-Add the jquery-migrate master as a remote. I label mine "upstream"
+Add the jquery-migrate repository as a remote; I label mine "upstream":
 
 ```bash
 $ git remote add upstream git://github.com/jquery/jquery-migrate.git
 ```
 
-Get in the habit of pulling in the "upstream" master to stay up to date as jQuery receives new commits
+Get in the habit of pulling in the "upstream" `main` branch to stay up to date as jQuery Migrate receives new commits:
 
 ```bash
-$ git pull upstream master
+$ git pull upstream main
 ```
 
 Run the Grunt tools:
@@ -121,14 +121,14 @@ Success! You just built and tested jQuery!
 
 ### Fix a bug from a ticket filed at bugs.jquery.com:
 
-**NEVER write your patches to the master branch**
+**NEVER write your patches to the `main` branch**
 
 **ALWAYS USE A "TOPIC" BRANCH!** Like so (#### = the ticket #)...
 
-Make sure you start with your up-to-date master:
+Make sure you start with your up-to-date `main` branch:
 
 ```bash
-$ git checkout master
+$ git checkout main
 ```
 
 Create and checkout a new branch that includes the ticket #
@@ -179,16 +179,16 @@ Then, push your branch with the bug fix commits to your github fork
 $ git push origin -u bug_####
 ```
 
-Before you tackle your next bug patch, return to the master:
+Before you tackle your next bug patch, return to the `main` branch:
 
 ```bash
-$ git checkout master
+$ git checkout main
 ```
 
 
 ### Test Suite Tips...
 
-By default the plugin runs against the current (jquery-git WIP) version of jQuery. You can select a different version by specifying it in the URL. Files are always retrieved from code.jquery.com. 
+By default the plugin runs against the current (jquery-3.x-git WIP) version of jQuery. You can select a different version by specifying it in the URL. Files are always retrieved from code.jquery.com or releases.jquery.com (the latter for development versions).
 
 Example:
 

diff --git a/Gruntfile.js b/Gruntfile.js
@@ -6,29 +6,40 @@ module.exports = function( grunt ) {
 
 	const gzip = require( "gzip-js" );
 
+	const oldNode = /^v10\./.test( process.version );
+
 	const karmaFilesExceptJQuery = [
+		"external/npo/npo.js",
 		"dist/jquery-migrate.min.js",
 		"test/data/compareVersions.js",
 
-		"test/testinit.js",
-		"test/migrate.js",
-		"test/core.js",
-		"test/ajax.js",
-		"test/attributes.js",
-		"test/css.js",
-		"test/data.js",
-		"test/deferred.js",
-		"test/effects.js",
-		"test/event.js",
-		"test/manipulation.js",
-		"test/offset.js",
-		"test/serialize.js",
-		"test/traversing.js",
+		"test/data/testinit.js",
+		"test/data/test-utils.js",
+		"test/unit/migrate.js",
+		"test/unit/jquery/core.js",
+		"test/unit/jquery/ajax.js",
+		"test/unit/jquery/attributes.js",
+		"test/unit/jquery/css.js",
+		"test/unit/jquery/data.js",
+		"test/unit/jquery/deferred.js",
+		"test/unit/jquery/effects.js",
+		"test/unit/jquery/event.js",
+		"test/unit/jquery/manipulation.js",
+		"test/unit/jquery/offset.js",
+		"test/unit/jquery/serialize.js",
+		"test/unit/jquery/traversing.js",
 
 		{ pattern: "dist/jquery-migrate.js", included: false, served: true },
-		{ pattern: "test/**/*.@(js|css|jpg|html|xml)", included: false, served: true }
+		{ pattern: "test/**/*.@(js|json|css|jpg|html|xml)", included: false, served: true }
 	];
 
+	// Support: Node.js <12
+	// Skip running tasks that dropped support for Node.js 10
+	// in this Node version.
+	function runIfNewNode( task ) {
+		return oldNode ? "print_old_node_message:" + task : task;
+	}
+
 	// Project configuration.
 	grunt.initConfig( {
 		pkg: grunt.file.readJSON( "package.json" ),
@@ -55,6 +66,8 @@ module.exports = function( grunt ) {
 				"min+3.x-git.min",
 				"dev+3.x-git.slim",
 				"min+3.x-git.slim.min",
+				"dev+3.6.0",
+				"dev+3.6.0.slim",
 				"dev+3.5.1",
 				"dev+3.5.1.slim",
 				"dev+3.4.1",
@@ -111,6 +124,20 @@ module.exports = function( grunt ) {
 				]
 			}
 		},
+		npmcopy: {
+			all: {
+				options: {
+					destPrefix: "external"
+				},
+				files: {
+					"npo/npo.js": "native-promise-only/lib/npo.src.js",
+
+					"qunit/qunit.js": "qunit/qunit/qunit.js",
+					"qunit/qunit.css": "qunit/qunit/qunit.css",
+					"qunit/LICENSE.txt": "qunit/LICENSE.txt"
+				}
+			}
+		},
 		uglify: {
 			all: {
 				files: {
@@ -123,17 +150,17 @@ module.exports = function( grunt ) {
 					sourceMapName: "dist/jquery-migrate.min.map",
 					report: "min",
 					output: {
-						"ascii_only": true,
+						ascii_only: true,
 
 						// Support: Android 4.0 only
 						// UglifyJS 3 breaks Android 4.0 if this option is not enabled.
-						// This is in lieu of setting ie8 for all of mangle, compress, and output
-						"ie8": true
+						// This is in lieu of setting ie for all of mangle, compress, and output
+						ie: true
 					},
 					banner: "/*! jQuery Migrate v<%= pkg.version %>" +
 						" | (c) <%= pkg.author.name %> | jquery.org/license */",
 					compress: {
-						"hoist_funs": false,
+						hoist_funs: false,
 						loops: false,
 
 						// Support: IE <11
@@ -154,7 +181,7 @@ module.exports = function( grunt ) {
 				},
 				frameworks: [ "qunit" ],
 				files: [
-					"https://code.jquery.com/jquery-3.x-git.min.js",
+					"https://releases.jquery.com/git/jquery-3.x-git.min.js",
 					...karmaFilesExceptJQuery
 				],
 				client: {
@@ -179,7 +206,7 @@ module.exports = function( grunt ) {
 
 				options: {
 					files: [
-						"https://code.jquery.com/jquery-3.x-git.slim.min.js",
+						"https://releases.jquery.com/git/jquery-3.x-git.slim.min.js",
 						...karmaFilesExceptJQuery
 					]
 				}
@@ -212,6 +239,11 @@ module.exports = function( grunt ) {
 	// Integrate jQuery migrate specific tasks
 	grunt.loadTasks( "build/tasks" );
 
+	grunt.registerTask( "print_old_node_message", ( ...args ) => {
+		var task = args.join( ":" );
+		grunt.log.writeln( "Old Node.js detected, running the task \"" + task + "\" skipped..." );
+	} );
+
 	// Just an alias
 	grunt.registerTask( "test", [
 		"karma:main",
@@ -224,11 +256,12 @@ module.exports = function( grunt ) {
 		// would run the dist target first which would point to errors in the built
 		// file, making it harder to fix them. We want to check the built file only
 		// if we already know the source files pass the linter.
-		"eslint:dev",
-		"eslint:dist"
+		runIfNewNode( "eslint:dev" ),
+		runIfNewNode( "eslint:dist" )
 	] );
 
 	grunt.registerTask( "default-no-test", [
+		"npmcopy",
 		"build",
 		"uglify",
 		"lint",

diff --git a/README.md b/README.md
@@ -1,4 +1,4 @@
-[![Build Status](https://travis-ci.org/jquery/jquery-migrate.svg?branch=master)](https://travis-ci.org/jquery/jquery-migrate)
+![CI Status](https://github.com/jquery/jquery-migrate/actions/workflows/node.js.yml/badge.svg?branch=main)
 
 #### NOTE: To upgrade to jQuery 3.0, you first need version 1.12.x or 2.2.x. If you're using an older version, first upgrade to one of these versions using [jQuery Migrate 1.x](https://github.com/jquery/jquery-migrate/tree/1.x-stable#readme), to resolve any compatibility issues. For more information about the changes made in jQuery 3.0, see the [upgrade guide](https://jquery.com/upgrade-guide/3.0/) and [blog post](https://blog.jquery.com/2016/06/09/jquery-3-0-final-released/).
 
@@ -12,8 +12,8 @@ That way you can spot and fix what otherwise would have been errors, until you n
 In your web page, load this plugin *after* the script tag for jQuery, for example:
 
 ```html
-<script src="https://code.jquery.com/jquery-3.0.0.js"></script>
-<script src="https://code.jquery.com/jquery-migrate-3.3.1.js"></script>
+<script src="https://code.jquery.com/jquery-3.6.0.js"></script>
+<script src="https://code.jquery.com/jquery-migrate-3.4.0.js"></script>
 ```
 
 ## Download
@@ -26,8 +26,8 @@ The production build is minified and does not generate console warnings. It will
 |--|-------------|------------|
 | Debugging enabled | <p align="center">✓</p> |  |
 | Minified |  | <p align="center">✓</p> |
-| Latest release (*may be hotlinked if desired*) | [jquery-migrate-3.3.1.js](https://code.jquery.com/jquery-migrate-3.3.1.js) | [jquery-migrate-3.3.1.min.js](https://code.jquery.com/jquery-migrate-3.3.1.min.js) |
-| \* Latest work-in-progress build | [jquery-migrate-git.js](https://code.jquery.com/jquery-migrate-git.js) | [jquery-migrate-git.min.js](https://code.jquery.com/jquery-migrate-git.min.js) |
+| Latest release (*may be hotlinked if desired*) | [jquery-migrate-3.4.0.js](https://code.jquery.com/jquery-migrate-3.4.0.js) | [jquery-migrate-3.4.0.min.js](https://code.jquery.com/jquery-migrate-3.4.0.min.js) |
+| \* Latest work-in-progress build | [jquery-migrate-git.js](https://releases.jquery.com/git/jquery-migrate-git.js) | [jquery-migrate-git.min.js](https://releases.jquery.com/git/jquery-migrate-git.min.js) |
 
 
 \* **Work-in-progress build:** Although this file represents the most recent updates to the plugin, it may not have been thoroughly tested. We do not recommend using this file on production sites since it may be unstable; use the released production version instead.
@@ -37,7 +37,7 @@ The production build is minified and does not generate console warnings. It will
 
 The development version of the plugin displays warnings in the browser console. Older browsers such as IE9 doesn't support the console interface. No messages will be generated unless you include a debugging library such as [Firebug Lite](https://getfirebug.com/firebuglite) before including the jQuery Migrate plugin. Developers can also inspect the `jQuery.migrateWarnings` array to see what error messages have been generated.
 
-All warnings generated by this plugin start with the string "JQMIGRATE". A list of the warnings you may see are in [warnings.md](https://github.com/jquery/jquery-migrate/blob/master/warnings.md).
+All warnings generated by this plugin start with the string "JQMIGRATE". A list of the warnings you may see are in [warnings.md](https://github.com/jquery/jquery-migrate/blob/main/warnings.md).
 
 
 ## Migrate Plugin API
@@ -56,6 +56,14 @@ This plugin adds some properties to the `jQuery` object that can be used to prog
 
 `jQuery.migrateDeduplicateWarnings`: By default, Migrate only gives a specific warning once. If you set this property to `false` it will give a warning for every occurrence each time it happens. Note that this can generate a lot of output, for example when a warning occurs in a loop.
 
+`jQuery.migrateDisablePatches`: Disables patches by their codes. You can find a code for each patch in square brackets in [warnings.md](https://github.com/jquery/jquery-migrate/blob/main/warnings.md). A limited number of warnings doesn't have codes defined and cannot be disabled. These are mostly setup issues like using an incorrect version of jQuery or loading Migrate multiple times.
+
+`jQuery.migrateDisablePatches`: Disables patches by their codes.
+
+`jQuery.migrateIsPatchEnabled`: Returns `true` if a patch of a provided code is enabled and `false` otherwise.
+
+`jQuery.UNSAFE_restoreLegacyHtmlPrefilter`: A deprecated alias of `jQuery.migrateEnablePatches( "self-closed-tags" )`
+
 ## Reporting problems
 
 Bugs that only occur when the jQuery Migrate plugin is used should be reported in the [jQuery Migrate Issue Tracker](https://github.com/jquery/jquery-migrate/issues) and should be accompanied by an executable test case that demonstrates the bug. The easiest way to do this is via an online test tool such as [jsFiddle.net](https://jsFiddle.net/) or [jsbin.com](https://jsbin.com). Use the development version when you are reporting bugs.

diff --git a/build/copygit.sh b/build/copygit.sh