Core: Drop support for IE <11, iOS <10, Android Browser & PhantomJS

Also, update support comments format to match format described in:
jquery/contribute.jquery.org#95 (comment)
with the change from:
jquery/contribute.jquery.org#95 (comment)
(open-ended ranges end with `+`).

Further size reductions will be achieved when we drop Firefox 60, iOS 10
and pre-Chromium Edge versions.

Fixes jquerygh-3950
Fixes jquerygh-4299

.eslintrc-browser.json

@@ -3,11 +3,8 @@
 
 	"extends": "jquery",
 
-	// Support: IE <=9 only, Android <=4.0 only
-	// The above browsers are failing a lot of tests in the ES5
-	// test suite at http://test262.ecmascript.org.
 	"parserOptions": {
-		"ecmaVersion": 3
+		"ecmaVersion": 5
 	},
 
 	// The browser env is not enabled on purpose so that code takes

.travis.yml

@@ -1,7 +1,6 @@
 language: node_js
 sudo: false
 node_js:
-- "6"
 - "8"
 - "10"
 - "11"

Gruntfile.js

@@ -14,15 +14,7 @@ module.exports = function( grunt ) {
 
 	var fs = require( "fs" ),
 		gzip = require( "gzip-js" ),
-		isTravis = process.env.TRAVIS,
-		oldNode = /^v6\./.test( process.version );
-
-	// Support: Node.js <8
-	// Skip running tasks that dropped support for Node.js 6
-	// in those Node versions.
-	function runIfNewNode( task ) {
-		return oldNode ? "print_old_node_message:" + task : task;
-	}
+		isTravis = process.env.TRAVIS;
 
 	if ( !grunt.option( "filename" ) ) {
 		grunt.option( "filename", "jquery.js" );
@@ -123,10 +115,9 @@ module.exports = function( grunt ) {
 		testswarm: {
 			tests: [
 
-				// A special module with basic tests, meant for
-				// not fully supported environments like Android 2.3,
-				// jsdom or PhantomJS. We run it everywhere, though,
-				// to make sure tests are not broken.
+				// A special module with basic tests, meant for not fully
+				// supported environments like jsdom. We run it everywhere,
+				// though, to make sure tests are not broken.
 				"basic",
 
 				"ajax",
@@ -291,23 +282,13 @@ module.exports = function( grunt ) {
 						"dist/<%= grunt.option('filename').replace('.js', '.min.map') %>",
 					report: "min",
 					output: {
-						"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
+						"ascii_only": true
 					},
 					banner: "/*! jQuery v<%= pkg.version %> | " +
 						"(c) JS Foundation and other contributors | jquery.org/license */",
 					compress: {
 						"hoist_funs": false,
-						loops: false,
-
-						// Support: IE <11
-						// typeofs transformation is unsafe for IE9-10
-						// See https://github.com/mishoo/UglifyJS2/issues/2198
-						typeofs: false
+						loops: false
 					}
 				}
 			}
@@ -320,13 +301,6 @@ module.exports = function( grunt ) {
 	// Integrate jQuery specific tasks
 	grunt.loadTasks( "build/tasks" );
 
-	// Support: Node.js <8
-	// Print a message on Node.js <8 notifying the task is skipped there.
-	grunt.registerTask( "print_old_node_message", function() {
-		var task = [].slice.call( arguments ).join( ":" );
-		grunt.log.writeln( "Old Node.js detected, running the task \"" + task + "\" skipped..." );
-	} );
-
 	grunt.registerTask( "lint", [
 		"jsonlint",
 
@@ -349,10 +323,7 @@ module.exports = function( grunt ) {
 	grunt.registerTask( "test:fast", "node_smoke_tests" );
 	grunt.registerTask( "test:slow", [
 		"promises_aplus_tests",
-
-		// Support: Node.js <8
-		// Karma no longer supports Node.js <8 as it relies on async-await internally.
-		runIfNewNode( "karma:jsdom" )
+		"karma:jsdom"
 	] );
 
 	grunt.registerTask( "test", [

src/ajax.js

@@ -1,7 +1,6 @@
 define( [
 	"./core",
 	"./var/document",
-	"./var/isFunction",
 	"./var/rnothtmlwhite",
 	"./ajax/var/location",
 	"./ajax/var/nonce",
@@ -12,7 +11,7 @@ define( [
 	"./event/trigger",
 	"./deferred",
 	"./serialize" // jQuery.param
-], function( jQuery, document, isFunction, rnothtmlwhite, location, nonce, rquery ) {
+], function( jQuery, document, rnothtmlwhite, location, nonce, rquery ) {
 
 "use strict";
 
@@ -67,7 +66,7 @@ function addToPrefiltersOrTransports( structure ) {
 			i = 0,
 			dataTypes = dataTypeExpression.toLowerCase().match( rnothtmlwhite ) || [];
 
-		if ( isFunction( func ) ) {
+		if ( typeof func === "function" ) {
 
 			// For each dataType in the dataTypeExpression
 			while ( ( dataType = dataTypes[ i++ ] ) ) {
@@ -541,13 +540,13 @@ jQuery.extend( {
 		if ( s.crossDomain == null ) {
 			urlAnchor = document.createElement( "a" );
 
-			// Support: IE <=8 - 11, Edge 12 - 15
+			// Support: IE <=8 - 11+, Edge 12 - 17 only
 			// IE throws exception on accessing the href property if url is malformed,
 			// e.g. http://example.com:80x/
 			try {
 				urlAnchor.href = s.url;
 
-				// Support: IE <=8 - 11 only
+				// Support: IE <=8 - 11+
 				// Anchor's host property isn't correctly set when s.url is relative
 				urlAnchor.href = urlAnchor.href;
 				s.crossDomain = originAnchor.protocol + "//" + originAnchor.host !==
@@ -837,7 +836,7 @@ jQuery.each( [ "get", "post" ], function( i, method ) {
 	jQuery[ method ] = function( url, data, callback, type ) {
 
 		// Shift arguments if data argument was omitted
-		if ( isFunction( data ) ) {
+		if ( typeof data === "function" ) {
 			type = type || callback;
 			callback = data;
 			data = undefined;

src/ajax/jsonp.js

@@ -1,10 +1,9 @@
 define( [
 	"../core",
-	"../var/isFunction",
 	"./var/nonce",
 	"./var/rquery",
 	"../ajax"
-], function( jQuery, isFunction, nonce, rquery ) {
+], function( jQuery, nonce, rquery ) {
 
 "use strict";
 
@@ -37,7 +36,7 @@ jQuery.ajaxPrefilter( "json jsonp", function( s, originalSettings, jqXHR ) {
 	if ( jsonProp || s.dataTypes[ 0 ] === "jsonp" ) {
 
 		// Get callback name, remembering preexisting value associated with it
-		callbackName = s.jsonpCallback = isFunction( s.jsonpCallback ) ?
+		callbackName = s.jsonpCallback = typeof s.jsonpCallback === "function" ?
 			s.jsonpCallback() :
 			s.jsonpCallback;
 
@@ -88,7 +87,7 @@ jQuery.ajaxPrefilter( "json jsonp", function( s, originalSettings, jqXHR ) {
 			}
 
 			// Call if it was a function and we have a response
-			if ( responseContainer && isFunction( overwritten ) ) {
+			if ( responseContainer && typeof overwritten === "function" ) {
 				overwritten( responseContainer[ 0 ] );
 			}
 

src/ajax/load.js

@@ -1,13 +1,12 @@
 define( [
 	"../core",
 	"../core/stripAndCollapse",
-	"../var/isFunction",
 	"../core/parseHTML",
 	"../ajax",
 	"../traversing",
 	"../manipulation",
 	"../selector"
-], function( jQuery, stripAndCollapse, isFunction ) {
+], function( jQuery, stripAndCollapse ) {
 
 "use strict";
 
@@ -25,7 +24,7 @@ jQuery.fn.load = function( url, params, callback ) {
 	}
 
 	// If it's a function
-	if ( isFunction( params ) ) {
+	if ( typeof params === "function" ) {
 
 		// We assume that it's the callback
 		callback = params;

src/ajax/parseXML.js

@@ -11,7 +11,7 @@ jQuery.parseXML = function( data ) {
 		return null;
 	}
 
-	// Support: IE 9 - 11 only
+	// Support: IE 9 - 11+
 	// IE throws on parseFromString with invalid input.
 	try {
 		xml = ( new window.DOMParser() ).parseFromString( data, "text/xml" );