13 files changed, 966 insertions, 400 deletions

diff --git a/platform/javascript/js/engine/config.js b/platform/javascript/js/engine/config.js
index bba20dc360..ba61b14eb7 100644
--- a/platform/javascript/js/engine/config.js
+++ b/platform/javascript/js/engine/config.js
@@ -91,16 +91,42 @@ const InternalConfig = function (initConfig) { // eslint-disable-line no-unused-
 		 */
 		args: [],
 		/**
+		 * When enabled, the game canvas will automatically grab the focus when the engine starts.
+		 *
+		 * @memberof EngineConfig
+		 * @type {boolean}
+		 * @default
+		 */
+		focusCanvas: true,
+		/**
+		 * When enabled, this will turn on experimental virtual keyboard support on mobile.
+		 *
+		 * @memberof EngineConfig
+		 * @type {boolean}
+		 * @default
+		 */
+		experimentalVK: false,
+		/**
 		 * @ignore
 		 * @type {Array.<string>}
 		 */
 		persistentPaths: ['/userfs'],
 		/**
 		 * @ignore
+		 * @type {boolean}
+		 */
+		persistentDrops: false,
+		/**
+		 * @ignore
 		 * @type {Array.<string>}
 		 */
 		gdnativeLibs: [],
 		/**
+		 * @ignore
+		 * @type {Array.<string>}
+		 */
+		fileSizes: [],
+		/**
 		 * A callback function for handling Godot's ``OS.execute`` calls.
 		 *
 		 * This is for example used in the Web Editor template to switch between project manager and editor, and for running the game.
@@ -218,7 +244,11 @@ const InternalConfig = function (initConfig) { // eslint-disable-line no-unused-
 		this.locale = parse('locale', this.locale);
 		this.canvasResizePolicy = parse('canvasResizePolicy', this.canvasResizePolicy);
 		this.persistentPaths = parse('persistentPaths', this.persistentPaths);
+		this.persistentDrops = parse('persistentDrops', this.persistentDrops);
+		this.experimentalVK = parse('experimentalVK', this.experimentalVK);
+		this.focusCanvas = parse('focusCanvas', this.focusCanvas);
 		this.gdnativeLibs = parse('gdnativeLibs', this.gdnativeLibs);
+		this.fileSizes = parse('fileSizes', this.fileSizes);
 		this.args = parse('args', this.args);
 		this.onExecute = parse('onExecute', this.onExecute);
 		this.onExit = parse('onExit', this.onExit);
@@ -227,10 +257,10 @@ const InternalConfig = function (initConfig) { // eslint-disable-line no-unused-
 	/**
 	 * @ignore
 	 * @param {string} loadPath
-	 * @param {Promise} loadPromise
+	 * @param {Response} response
 	 */
-	Config.prototype.getModuleConfig = function (loadPath, loadPromise) {
-		let loader = loadPromise;
+	Config.prototype.getModuleConfig = function (loadPath, response) {
+		let r = response;
 		return {
 			'print': this.onPrint,
 			'printErr': this.onPrintError,
@@ -238,12 +268,17 @@ const InternalConfig = function (initConfig) { // eslint-disable-line no-unused-
 			'noExitRuntime': true,
 			'dynamicLibraries': [`${loadPath}.side.wasm`],
 			'instantiateWasm': function (imports, onSuccess) {
-				loader.then(function (xhr) {
-					WebAssembly.instantiate(xhr.response, imports).then(function (result) {
-						onSuccess(result['instance'], result['module']);
+				function done(result) {
+					onSuccess(result['instance'], result['module']);
+				}
+				if (typeof (WebAssembly.instantiateStreaming) !== 'undefined') {
+					WebAssembly.instantiateStreaming(Promise.resolve(r), imports).then(done);
+				} else {
+					r.arrayBuffer().then(function (buffer) {
+						WebAssembly.instantiate(buffer, imports).then(done);
 					});
-				});
-				loader = null;
+				}
+				r = null;
 				return {};
 			},
 			'locateFile': function (path) {
@@ -296,6 +331,9 @@ const InternalConfig = function (initConfig) { // eslint-disable-line no-unused-
 			'canvas': this.canvas,
 			'canvasResizePolicy': this.canvasResizePolicy,
 			'locale': locale,
+			'persistentDrops': this.persistentDrops,
+			'virtualKeyboard': this.experimentalVK,
+			'focusCanvas': this.focusCanvas,
 			'onExecute': this.onExecute,
 			'onExit': function (p_code) {
 				cleanup(); // We always need to call the cleanup callback to free memory.
diff --git a/platform/javascript/js/engine/engine.externs.js b/platform/javascript/js/engine/engine.externs.js
index 1a94dd15ec..35a66a93ae 100644
--- a/platform/javascript/js/engine/engine.externs.js
+++ b/platform/javascript/js/engine/engine.externs.js
@@ -1,3 +1,4 @@
 var Godot;
 var WebAssembly = {};
 WebAssembly.instantiate = function(buffer, imports) {};
+WebAssembly.instantiateStreaming = function(response, imports) {};
diff --git a/platform/javascript/js/engine/engine.js b/platform/javascript/js/engine/engine.js
index c51955ed3d..17a8df9e29 100644
--- a/platform/javascript/js/engine/engine.js
+++ b/platform/javascript/js/engine/engine.js
@@ -35,14 +35,15 @@ const Engine = (function () {
 	 * Load the engine from the specified base path.
 	 *
 	 * @param {string} basePath Base path of the engine to load.
+	 * @param {number=} [size=0] The file size if known.
 	 * @returns {Promise} A Promise that resolves once the engine is loaded.
 	 *
 	 * @function Engine.load
 	 */
-	Engine.load = function (basePath) {
+	Engine.load = function (basePath, size) {
 		if (loadPromise == null) {
 			loadPath = basePath;
-			loadPromise = preloader.loadPromise(`${loadPath}.wasm`);
+			loadPromise = preloader.loadPromise(`${loadPath}.wasm`, size, true);
 			requestAnimationFrame(preloader.animateProgress);
 		}
 		return loadPromise;
@@ -96,23 +97,31 @@ const Engine = (function () {
 						initPromise = Promise.reject(new Error('A base path must be provided when calling `init` and the engine is not loaded.'));
 						return initPromise;
 					}
-					Engine.load(basePath);
+					Engine.load(basePath, this.config.fileSizes[`${basePath}.wasm`]);
 				}
-				preloader.setProgressFunc(this.config.onProgress);
-				let config = this.config.getModuleConfig(loadPath, loadPromise);
 				const me = this;
-				initPromise = new Promise(function (resolve, reject) {
-					Godot(config).then(function (module) {
-						module['initFS'](me.config.persistentPaths).then(function (fs_err) {
-							me.rtenv = module;
-							if (me.config.unloadAfterInit) {
-								Engine.unload();
-							}
-							resolve();
-							config = null;
+				function doInit(promise) {
+					// Care! Promise chaining is bogus with old emscripten versions.
+					// This caused a regression with the Mono build (which uses an older emscripten version).
+					// Make sure to test that when refactoring.
+					return new Promise(function (resolve, reject) {
+						promise.then(function (response) {
+							const cloned = new Response(response.clone().body, { 'headers': [['content-type', 'application/wasm']] });
+							Godot(me.config.getModuleConfig(loadPath, cloned)).then(function (module) {
+								const paths = me.config.persistentPaths;
+								module['initFS'](paths).then(function (err) {
+									me.rtenv = module;
+									if (me.config.unloadAfterInit) {
+										Engine.unload();
+									}
+									resolve();
+								});
+							});
 						});
 					});
-				});
+				}
+				preloader.setProgressFunc(this.config.onProgress);
+				initPromise = doInit(loadPromise);
 				return initPromise;
 			},
 
@@ -133,7 +142,7 @@ const Engine = (function () {
 			 * @returns {Promise} A Promise that resolves once the file is loaded.
 			 */
 			preloadFile: function (file, path) {
-				return preloader.preload(file, path);
+				return preloader.preload(file, path, this.config.fileSizes[file]);
 			},
 
 			/**
diff --git a/platform/javascript/js/engine/preloader.js b/platform/javascript/js/engine/preloader.js
index ec34fb93f2..564c68d264 100644
--- a/platform/javascript/js/engine/preloader.js
+++ b/platform/javascript/js/engine/preloader.js
@@ -1,54 +1,62 @@
 const Preloader = /** @constructor */ function () { // eslint-disable-line no-unused-vars
-	const loadXHR = function (resolve, reject, file, tracker, attempts) {
-		const xhr = new XMLHttpRequest();
+	function getTrackedResponse(response, load_status) {
+		function onloadprogress(reader, controller) {
+			return reader.read().then(function (result) {
+				if (load_status.done) {
+					return Promise.resolve();
+				}
+				if (result.value) {
+					controller.enqueue(result.value);
+					load_status.loaded += result.value.length;
+				}
+				if (!result.done) {
+					return onloadprogress(reader, controller);
+				}
+				load_status.done = true;
+				return Promise.resolve();
+			});
+		}
+		const reader = response.body.getReader();
+		return new Response(new ReadableStream({
+			start: function (controller) {
+				onloadprogress(reader, controller).then(function () {
+					controller.close();
+				});
+			},
+		}), { headers: response.headers });
+	}
+
+	function loadFetch(file, tracker, fileSize, raw) {
 		tracker[file] = {
-			total: 0,
+			total: fileSize || 0,
 			loaded: 0,
-			final: false,
+			done: false,
 		};
-		xhr.onerror = function () {
+		return fetch(file).then(function (response) {
+			if (!response.ok) {
+				return Promise.reject(new Error(`Failed loading file '${file}'`));
+			}
+			const tr = getTrackedResponse(response, tracker[file]);
+			if (raw) {
+				return Promise.resolve(tr);
+			}
+			return tr.arrayBuffer();
+		});
+	}
+
+	function retry(func, attempts = 1) {
+		function onerror(err) {
 			if (attempts <= 1) {
-				reject(new Error(`Failed loading file '${file}'`));
-			} else {
+				return Promise.reject(err);
+			}
+			return new Promise(function (resolve, reject) {
 				setTimeout(function () {
-					loadXHR(resolve, reject, file, tracker, attempts - 1);
+					retry(func, attempts - 1).then(resolve).catch(reject);
 				}, 1000);
-			}
-		};
-		xhr.onabort = function () {
-			tracker[file].final = true;
-			reject(new Error(`Loading file '${file}' was aborted.`));
-		};
-		xhr.onloadstart = function (ev) {
-			tracker[file].total = ev.total;
-			tracker[file].loaded = ev.loaded;
-		};
-		xhr.onprogress = function (ev) {
-			tracker[file].loaded = ev.loaded;
-			tracker[file].total = ev.total;
-		};
-		xhr.onload = function () {
-			if (xhr.status >= 400) {
-				if (xhr.status < 500 || attempts <= 1) {
-					reject(new Error(`Failed loading file '${file}': ${xhr.statusText}`));
-					xhr.abort();
-				} else {
-					setTimeout(function () {
-						loadXHR(resolve, reject, file, tracker, attempts - 1);
-					}, 1000);
-				}
-			} else {
-				tracker[file].final = true;
-				resolve(xhr);
-			}
-		};
-		// Make request.
-		xhr.open('GET', file);
-		if (!file.endsWith('.js')) {
-			xhr.responseType = 'arraybuffer';
+			});
 		}
-		xhr.send();
-	};
+		return func().catch(onerror);
+	}
 
 	const DOWNLOAD_ATTEMPTS_MAX = 4;
 	const loadingFiles = {};
@@ -63,7 +71,7 @@ const Preloader = /** @constructor */ function () { // eslint-disable-line no-un
 
 		Object.keys(loadingFiles).forEach(function (file) {
 			const stat = loadingFiles[file];
-			if (!stat.final) {
+			if (!stat.done) {
 				progressIsFinal = false;
 			}
 			if (!totalIsValid || stat.total === 0) {
@@ -92,21 +100,19 @@ const Preloader = /** @constructor */ function () { // eslint-disable-line no-un
 		progressFunc = callback;
 	};
 
-	this.loadPromise = function (file) {
-		return new Promise(function (resolve, reject) {
-			loadXHR(resolve, reject, file, loadingFiles, DOWNLOAD_ATTEMPTS_MAX);
-		});
+	this.loadPromise = function (file, fileSize, raw = false) {
+		return retry(loadFetch.bind(null, file, loadingFiles, fileSize, raw), DOWNLOAD_ATTEMPTS_MAX);
 	};
 
 	this.preloadedFiles = [];
-	this.preload = function (pathOrBuffer, destPath) {
+	this.preload = function (pathOrBuffer, destPath, fileSize) {
 		let buffer = null;
 		if (typeof pathOrBuffer === 'string') {
 			const me = this;
-			return this.loadPromise(pathOrBuffer).then(function (xhr) {
+			return this.loadPromise(pathOrBuffer, fileSize).then(function (buf) {
 				me.preloadedFiles.push({
 					path: destPath || pathOrBuffer,
-					buffer: xhr.response,
+					buffer: buf,
 				});
 				return Promise.resolve();
 			});
diff --git a/platform/javascript/js/libs/library_godot_audio.js b/platform/javascript/js/libs/library_godot_audio.js
index 8e385e9176..45c3a3fe2e 100644
--- a/platform/javascript/js/libs/library_godot_audio.js
+++ b/platform/javascript/js/libs/library_godot_audio.js
@@ -59,7 +59,7 @@ const GodotAudio = {
 				}
 				onstatechange(state);
 			};
-			ctx.onstatechange(); // Immeditately notify state.
+			ctx.onstatechange(); // Immediately notify state.
 			// Update computed latency
 			GodotAudio.interval = setInterval(function () {
 				let computed_latency = 0;
@@ -238,6 +238,9 @@ const GodotAudioWorklet = {
 
 		close: function () {
 			return new Promise(function (resolve, reject) {
+				if (GodotAudioWorklet.promise === null) {
+					return;
+				}
 				GodotAudioWorklet.promise.then(function () {
 					GodotAudioWorklet.worklet.port.postMessage({
 						'cmd': 'stop',
@@ -247,7 +250,7 @@ const GodotAudioWorklet = {
 					GodotAudioWorklet.worklet = null;
 					GodotAudioWorklet.promise = null;
 					resolve();
-				});
+				}).catch(function (err) { /* aborted? */ });
 			});
 		},
 	},
diff --git a/platform/javascript/js/libs/library_godot_display.js b/platform/javascript/js/libs/library_godot_display.js
index fdb5cc0ec2..affae90370 100644
--- a/platform/javascript/js/libs/library_godot_display.js
+++ b/platform/javascript/js/libs/library_godot_display.js
@@ -192,33 +192,45 @@ const GodotDisplayDragDrop = {
 				GodotDisplayDragDrop.promises = [];
 				GodotDisplayDragDrop.pending_files = [];
 				callback(drops);
-				const dirs = [DROP.substr(0, DROP.length - 1)];
-				// Remove temporary files
-				files.forEach(function (file) {
-					FS.unlink(file);
-					let dir = file.replace(DROP, '');
-					let idx = dir.lastIndexOf('/');
-					while (idx > 0) {
-						dir = dir.substr(0, idx);
-						if (dirs.indexOf(DROP + dir) === -1) {
-							dirs.push(DROP + dir);
-						}
-						idx = dir.lastIndexOf('/');
-					}
-				});
-				// Remove dirs.
-				dirs.sort(function (a, b) {
-					const al = (a.match(/\//g) || []).length;
-					const bl = (b.match(/\//g) || []).length;
-					if (al > bl) {
-						return -1;
-					} else if (al < bl) {
-						return 1;
+				if (GodotConfig.persistent_drops) {
+					// Delay removal at exit.
+					GodotOS.atexit(function (resolve, reject) {
+						GodotDisplayDragDrop.remove_drop(files, DROP);
+						resolve();
+					});
+				} else {
+					GodotDisplayDragDrop.remove_drop(files, DROP);
+				}
+			});
+		},
+
+		remove_drop: function (files, drop_path) {
+			const dirs = [drop_path.substr(0, drop_path.length - 1)];
+			// Remove temporary files
+			files.forEach(function (file) {
+				FS.unlink(file);
+				let dir = file.replace(drop_path, '');
+				let idx = dir.lastIndexOf('/');
+				while (idx > 0) {
+					dir = dir.substr(0, idx);
+					if (dirs.indexOf(drop_path + dir) === -1) {
+						dirs.push(drop_path + dir);
 					}
-					return 0;
-				}).forEach(function (dir) {
-					FS.rmdir(dir);
-				});
+					idx = dir.lastIndexOf('/');
+				}
+			});
+			// Remove dirs.
+			dirs.sort(function (a, b) {
+				const al = (a.match(/\//g) || []).length;
+				const bl = (b.match(/\//g) || []).length;
+				if (al > bl) {
+					return -1;
+				} else if (al < bl) {
+					return 1;
+				}
+				return 0;
+			}).forEach(function (dir) {
+				FS.rmdir(dir);
 			});
 		},
 
@@ -231,6 +243,105 @@ const GodotDisplayDragDrop = {
 };
 mergeInto(LibraryManager.library, GodotDisplayDragDrop);
 
+const GodotDisplayVK = {
+
+	$GodotDisplayVK__deps: ['$GodotRuntime', '$GodotConfig', '$GodotDisplayListeners'],
+	$GodotDisplayVK__postset: 'GodotOS.atexit(function(resolve, reject) { GodotDisplayVK.clear(); resolve(); });',
+	$GodotDisplayVK: {
+		textinput: null,
+		textarea: null,
+
+		available: function () {
+			return GodotConfig.virtual_keyboard && 'ontouchstart' in window;
+		},
+
+		init: function (input_cb) {
+			function create(what) {
+				const elem = document.createElement(what);
+				elem.style.display = 'none';
+				elem.style.position = 'absolute';
+				elem.style.zIndex = '-1';
+				elem.style.background = 'transparent';
+				elem.style.padding = '0px';
+				elem.style.margin = '0px';
+				elem.style.overflow = 'hidden';
+				elem.style.width = '0px';
+				elem.style.height = '0px';
+				elem.style.border = '0px';
+				elem.style.outline = 'none';
+				elem.readonly = true;
+				elem.disabled = true;
+				GodotDisplayListeners.add(elem, 'input', function (evt) {
+					const c_str = GodotRuntime.allocString(elem.value);
+					input_cb(c_str, elem.selectionEnd);
+					GodotRuntime.free(c_str);
+				}, false);
+				GodotDisplayListeners.add(elem, 'blur', function (evt) {
+					elem.style.display = 'none';
+					elem.readonly = true;
+					elem.disabled = true;
+				}, false);
+				GodotConfig.canvas.insertAdjacentElement('beforebegin', elem);
+				return elem;
+			}
+			GodotDisplayVK.textinput = create('input');
+			GodotDisplayVK.textarea = create('textarea');
+			GodotDisplayVK.updateSize();
+		},
+		show: function (text, multiline, start, end) {
+			if (!GodotDisplayVK.textinput || !GodotDisplayVK.textarea) {
+				return;
+			}
+			if (GodotDisplayVK.textinput.style.display !== '' || GodotDisplayVK.textarea.style.display !== '') {
+				GodotDisplayVK.hide();
+			}
+			GodotDisplayVK.updateSize();
+			const elem = multiline ? GodotDisplayVK.textarea : GodotDisplayVK.textinput;
+			elem.readonly = false;
+			elem.disabled = false;
+			elem.value = text;
+			elem.style.display = 'block';
+			elem.focus();
+			elem.setSelectionRange(start, end);
+		},
+		hide: function () {
+			if (!GodotDisplayVK.textinput || !GodotDisplayVK.textarea) {
+				return;
+			}
+			[GodotDisplayVK.textinput, GodotDisplayVK.textarea].forEach(function (elem) {
+				elem.blur();
+				elem.style.display = 'none';
+				elem.value = '';
+			});
+		},
+		updateSize: function () {
+			if (!GodotDisplayVK.textinput || !GodotDisplayVK.textarea) {
+				return;
+			}
+			const rect = GodotConfig.canvas.getBoundingClientRect();
+			function update(elem) {
+				elem.style.left = `${rect.left}px`;
+				elem.style.top = `${rect.top}px`;
+				elem.style.width = `${rect.width}px`;
+				elem.style.height = `${rect.height}px`;
+			}
+			update(GodotDisplayVK.textinput);
+			update(GodotDisplayVK.textarea);
+		},
+		clear: function () {
+			if (GodotDisplayVK.textinput) {
+				GodotDisplayVK.textinput.remove();
+				GodotDisplayVK.textinput = null;
+			}
+			if (GodotDisplayVK.textarea) {
+				GodotDisplayVK.textarea.remove();
+				GodotDisplayVK.textarea = null;
+			}
+		},
+	},
+};
+mergeInto(LibraryManager.library, GodotDisplayVK);
+
 /*
  * Display server cursor helper.
  * Keeps track of cursor status and custom shapes.
@@ -400,6 +511,10 @@ const GodotDisplayScreen = {
 	$GodotDisplayScreen__deps: ['$GodotConfig', '$GodotOS', '$GL', 'emscripten_webgl_get_current_context'],
 	$GodotDisplayScreen: {
 		desired_size: [0, 0],
+		hidpi: true,
+		getPixelRatio: function () {
+			return GodotDisplayScreen.hidpi ? window.devicePixelRatio || 1 : 1;
+		},
 		isFullscreen: function () {
 			const elem = document.fullscreenElement || document.mozFullscreenElement
 				|| document.webkitFullscreenElement || document.msFullscreenElement;
@@ -477,7 +592,7 @@ const GodotDisplayScreen = {
 				}
 				return 0;
 			}
-			const scale = window.devicePixelRatio || 1;
+			const scale = GodotDisplayScreen.getPixelRatio();
 			if (isFullscreen || wantsFullWindow) {
 				// We need to match screen size.
 				width = window.innerWidth * scale;
@@ -507,7 +622,7 @@ mergeInto(LibraryManager.library, GodotDisplayScreen);
  * Exposes all the functions needed by DisplayServer implementation.
  */
 const GodotDisplay = {
-	$GodotDisplay__deps: ['$GodotConfig', '$GodotRuntime', '$GodotDisplayCursor', '$GodotDisplayListeners', '$GodotDisplayDragDrop', '$GodotDisplayGamepads', '$GodotDisplayScreen'],
+	$GodotDisplay__deps: ['$GodotConfig', '$GodotRuntime', '$GodotDisplayCursor', '$GodotDisplayListeners', '$GodotDisplayDragDrop', '$GodotDisplayGamepads', '$GodotDisplayScreen', '$GodotDisplayVK'],
 	$GodotDisplay: {
 		window_icon: '',
 		findDPI: function () {
@@ -555,7 +670,7 @@ const GodotDisplay = {
 
 	godot_js_display_pixel_ratio_get__sig: 'f',
 	godot_js_display_pixel_ratio_get: function () {
-		return window.devicePixelRatio || 1;
+		return GodotDisplayScreen.getPixelRatio();
 	},
 
 	godot_js_display_fullscreen_request__sig: 'i',
@@ -568,7 +683,7 @@ const GodotDisplay = {
 		return GodotDisplayScreen.exitFullscreen();
 	},
 
-	godot_js_display_desired_size_set__sig: 'v',
+	godot_js_display_desired_size_set__sig: 'vii',
 	godot_js_display_desired_size_set: function (width, height) {
 		GodotDisplayScreen.desired_size = [width, height];
 		GodotDisplayScreen.updateSize();
@@ -576,12 +691,16 @@ const GodotDisplay = {
 
 	godot_js_display_size_update__sig: 'i',
 	godot_js_display_size_update: function () {
-		return GodotDisplayScreen.updateSize();
+		const updated = GodotDisplayScreen.updateSize();
+		if (updated) {
+			GodotDisplayVK.updateSize();
+		}
+		return updated;
 	},
 
 	godot_js_display_screen_size_get__sig: 'vii',
 	godot_js_display_screen_size_get: function (width, height) {
-		const scale = window.devicePixelRatio || 1;
+		const scale = GodotDisplayScreen.getPixelRatio();
 		GodotRuntime.setHeapValue(width, window.screen.width * scale, 'i32');
 		GodotRuntime.setHeapValue(height, window.screen.height * scale, 'i32');
 	},
@@ -600,6 +719,17 @@ const GodotDisplay = {
 		GodotRuntime.setHeapValue(r_y, (y - rect.y) * rh, 'i32');
 	},
 
+	godot_js_display_has_webgl__sig: 'ii',
+	godot_js_display_has_webgl: function (p_version) {
+		if (p_version !== 1 && p_version !== 2) {
+			return false;
+		}
+		try {
+			return !!document.createElement('canvas').getContext(p_version === 2 ? 'webgl2' : 'webgl');
+		} catch (e) { /* Not available */ }
+		return false;
+	},
+
 	/*
 	 * Canvas
 	 */
@@ -671,7 +801,7 @@ const GodotDisplay = {
 			document.head.appendChild(link);
 		}
 		const old_icon = GodotDisplay.window_icon;
-		const png = new Blob([GodotRuntime.heapCopy(HEAPU8, p_ptr, p_len)], { type: 'image/png' });
+		const png = new Blob([GodotRuntime.heapSlice(HEAPU8, p_ptr, p_len)], { type: 'image/png' });
 		GodotDisplay.window_icon = URL.createObjectURL(png);
 		link.href = GodotDisplay.window_icon;
 		if (old_icon) {
@@ -711,7 +841,7 @@ const GodotDisplay = {
 		const shape = GodotRuntime.parseString(p_shape);
 		const old_shape = GodotDisplayCursor.cursors[shape];
 		if (p_len > 0) {
-			const png = new Blob([GodotRuntime.heapCopy(HEAPU8, p_ptr, p_len)], { type: 'image/png' });
+			const png = new Blob([GodotRuntime.heapSlice(HEAPU8, p_ptr, p_len)], { type: 'image/png' });
 			const url = URL.createObjectURL(png);
 			GodotDisplayCursor.cursors[shape] = {
 				url: url,
@@ -739,7 +869,7 @@ const GodotDisplay = {
 		const notif = [p_enter, p_exit, p_in, p_out];
 		['mouseover', 'mouseleave', 'focus', 'blur'].forEach(function (evt_name, idx) {
 			GodotDisplayListeners.add(canvas, evt_name, function () {
-				func.bind(null, notif[idx]);
+				func(notif[idx]);
 			}, true);
 		});
 	},
@@ -776,8 +906,8 @@ const GodotDisplay = {
 		GodotDisplayListeners.add(canvas, 'drop', GodotDisplayDragDrop.handler(dropFiles));
 	},
 
-	godot_js_display_setup_canvas__sig: 'viii',
-	godot_js_display_setup_canvas: function (p_width, p_height, p_fullscreen) {
+	godot_js_display_setup_canvas__sig: 'viiii',
+	godot_js_display_setup_canvas: function (p_width, p_height, p_fullscreen, p_hidpi) {
 		const canvas = GodotConfig.canvas;
 		GodotDisplayListeners.add(canvas, 'contextmenu', function (ev) {
 			ev.preventDefault();
@@ -786,6 +916,7 @@ const GodotDisplay = {
 			alert('WebGL context lost, please reload the page'); // eslint-disable-line no-alert
 			ev.preventDefault();
 		}, false);
+		GodotDisplayScreen.hidpi = !!p_hidpi;
 		switch (GodotConfig.canvas_resize_policy) {
 		case 0: // None
 			GodotDisplayScreen.desired_size = [canvas.width, canvas.height];
@@ -800,12 +931,42 @@ const GodotDisplay = {
 			canvas.style.left = 0;
 			break;
 		}
+		GodotDisplayScreen.updateSize();
 		if (p_fullscreen) {
 			GodotDisplayScreen.requestFullscreen();
 		}
 	},
 
 	/*
+	 * Virtual Keyboard
+	 */
+	godot_js_display_vk_show__sig: 'viiii',
+	godot_js_display_vk_show: function (p_text, p_multiline, p_start, p_end) {
+		const text = GodotRuntime.parseString(p_text);
+		const start = p_start > 0 ? p_start : 0;
+		const end = p_end > 0 ? p_end : start;
+		GodotDisplayVK.show(text, p_multiline, start, end);
+	},
+
+	godot_js_display_vk_hide__sig: 'v',
+	godot_js_display_vk_hide: function () {
+		GodotDisplayVK.hide();
+	},
+
+	godot_js_display_vk_available__sig: 'i',
+	godot_js_display_vk_available: function () {
+		return GodotDisplayVK.available();
+	},
+
+	godot_js_display_vk_cb__sig: 'vi',
+	godot_js_display_vk_cb: function (p_input_cb) {
+		const input_cb = GodotRuntime.get_func(p_input_cb);
+		if (GodotDisplayVK.available()) {
+			GodotDisplayVK.init(input_cb);
+		}
+	},
+
+	/*
 	 * Gamepads
 	 */
 	godot_js_display_gamepad_cb__sig: 'vi',
diff --git a/platform/javascript/js/libs/library_godot_editor_tools.js b/platform/javascript/js/libs/library_godot_editor_tools.js
deleted file mode 100644
index d7f1ad5ea1..0000000000
--- a/platform/javascript/js/libs/library_godot_editor_tools.js
+++ /dev/null
@@ -1,57 +0,0 @@
-/*************************************************************************/
-/*  library_godot_editor_tools.js                                        */
-/*************************************************************************/
-/*                       This file is part of:                           */
-/*                           GODOT ENGINE                                */
-/*                      https://godotengine.org                          */
-/*************************************************************************/
-/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
-/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
-/*                                                                       */
-/* Permission is hereby granted, free of charge, to any person obtaining */
-/* a copy of this software and associated documentation files (the       */
-/* "Software"), to deal in the Software without restriction, including   */
-/* without limitation the rights to use, copy, modify, merge, publish,   */
-/* distribute, sublicense, and/or sell copies of the Software, and to    */
-/* permit persons to whom the Software is furnished to do so, subject to */
-/* the following conditions:                                             */
-/*                                                                       */
-/* The above copyright notice and this permission notice shall be        */
-/* included in all copies or substantial portions of the Software.       */
-/*                                                                       */
-/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
-/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
-/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
-/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
-/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
-/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
-/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
-/*************************************************************************/
-
-const GodotEditorTools = {
-	godot_js_editor_download_file__deps: ['$FS'],
-	godot_js_editor_download_file__sig: 'viii',
-	godot_js_editor_download_file: function (p_path, p_name, p_mime) {
-		const path = GodotRuntime.parseString(p_path);
-		const name = GodotRuntime.parseString(p_name);
-		const mime = GodotRuntime.parseString(p_mime);
-		const size = FS.stat(path)['size'];
-		const buf = new Uint8Array(size);
-		const fd = FS.open(path, 'r');
-		FS.read(fd, buf, 0, size);
-		FS.close(fd);
-		FS.unlink(path);
-		const blob = new Blob([buf], { type: mime });
-		const url = window.URL.createObjectURL(blob);
-		const a = document.createElement('a');
-		a.href = url;
-		a.download = name;
-		a.style.display = 'none';
-		document.body.appendChild(a);
-		a.click();
-		a.remove();
-		window.URL.revokeObjectURL(url);
-	},
-};
-
-mergeInto(LibraryManager.library, GodotEditorTools);
diff --git a/platform/javascript/js/libs/library_godot_eval.js b/platform/javascript/js/libs/library_godot_eval.js
deleted file mode 100644
index 9ab392b813..0000000000
--- a/platform/javascript/js/libs/library_godot_eval.js
+++ /dev/null
@@ -1,86 +0,0 @@
-/*************************************************************************/
-/*  library_godot_eval.js                                                */
-/*************************************************************************/
-/*                       This file is part of:                           */
-/*                           GODOT ENGINE                                */
-/*                      https://godotengine.org                          */
-/*************************************************************************/
-/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
-/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
-/*                                                                       */
-/* Permission is hereby granted, free of charge, to any person obtaining */
-/* a copy of this software and associated documentation files (the       */
-/* "Software"), to deal in the Software without restriction, including   */
-/* without limitation the rights to use, copy, modify, merge, publish,   */
-/* distribute, sublicense, and/or sell copies of the Software, and to    */
-/* permit persons to whom the Software is furnished to do so, subject to */
-/* the following conditions:                                             */
-/*                                                                       */
-/* The above copyright notice and this permission notice shall be        */
-/* included in all copies or substantial portions of the Software.       */
-/*                                                                       */
-/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
-/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
-/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
-/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
-/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
-/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
-/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
-/*************************************************************************/
-
-const GodotEval = {
-	godot_js_eval__deps: ['$GodotRuntime'],
-	godot_js_eval__sig: 'iiiiiii',
-	godot_js_eval: function (p_js, p_use_global_ctx, p_union_ptr, p_byte_arr, p_byte_arr_write, p_callback) {
-		const js_code = GodotRuntime.parseString(p_js);
-		let eval_ret = null;
-		try {
-			if (p_use_global_ctx) {
-				// indirect eval call grants global execution context
-				const global_eval = eval; // eslint-disable-line no-eval
-				eval_ret = global_eval(js_code);
-			} else {
-				eval_ret = eval(js_code); // eslint-disable-line no-eval
-			}
-		} catch (e) {
-			GodotRuntime.error(e);
-		}
-
-		switch (typeof eval_ret) {
-		case 'boolean':
-			GodotRuntime.setHeapValue(p_union_ptr, eval_ret, 'i32');
-			return 1; // BOOL
-
-		case 'number':
-			GodotRuntime.setHeapValue(p_union_ptr, eval_ret, 'double');
-			return 3; // REAL
-
-		case 'string':
-			GodotRuntime.setHeapValue(p_union_ptr, GodotRuntime.allocString(eval_ret), '*');
-			return 4; // STRING
-
-		case 'object':
-			if (eval_ret === null) {
-				break;
-			}
-
-			if (ArrayBuffer.isView(eval_ret) && !(eval_ret instanceof Uint8Array)) {
-				eval_ret = new Uint8Array(eval_ret.buffer);
-			} else if (eval_ret instanceof ArrayBuffer) {
-				eval_ret = new Uint8Array(eval_ret);
-			}
-			if (eval_ret instanceof Uint8Array) {
-				const func = GodotRuntime.get_func(p_callback);
-				const bytes_ptr = func(p_byte_arr, p_byte_arr_write, eval_ret.length);
-				HEAPU8.set(eval_ret, bytes_ptr);
-				return 20; // POOL_BYTE_ARRAY
-			}
-			break;
-
-			// no default
-		}
-		return 0; // NIL
-	},
-};
-
-mergeInto(LibraryManager.library, GodotEval);
diff --git a/platform/javascript/js/libs/library_godot_fetch.js b/platform/javascript/js/libs/library_godot_fetch.js
new file mode 100644
index 0000000000..615f9de8b0
--- /dev/null
+++ b/platform/javascript/js/libs/library_godot_fetch.js
@@ -0,0 +1,247 @@
+/*************************************************************************/
+/*  library_godot_fetch.js                                               */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+const GodotFetch = {
+	$GodotFetch__deps: ['$IDHandler', '$GodotRuntime'],
+	$GodotFetch: {
+
+		onread: function (id, result) {
+			const obj = IDHandler.get(id);
+			if (!obj) {
+				return;
+			}
+			if (result.value) {
+				obj.chunks.push(result.value);
+			}
+			obj.reading = false;
+			obj.done = result.done;
+		},
+
+		onresponse: function (id, response) {
+			const obj = IDHandler.get(id);
+			if (!obj) {
+				return;
+			}
+			let chunked = false;
+			response.headers.forEach(function (value, header) {
+				const v = value.toLowerCase().trim();
+				const h = header.toLowerCase().trim();
+				if (h === 'transfer-encoding' && v === 'chunked') {
+					chunked = true;
+				}
+			});
+			obj.status = response.status;
+			obj.response = response;
+			obj.reader = response.body.getReader();
+			obj.chunked = chunked;
+		},
+
+		onerror: function (id, err) {
+			GodotRuntime.error(err);
+			const obj = IDHandler.get(id);
+			if (!obj) {
+				return;
+			}
+			obj.error = err;
+		},
+
+		create: function (method, url, headers, body) {
+			const obj = {
+				request: null,
+				response: null,
+				reader: null,
+				error: null,
+				done: false,
+				reading: false,
+				status: 0,
+				chunks: [],
+				bodySize: -1,
+			};
+			const id = IDHandler.add(obj);
+			const init = {
+				method: method,
+				headers: headers,
+				body: body,
+			};
+			obj.request = fetch(url, init);
+			obj.request.then(GodotFetch.onresponse.bind(null, id)).catch(GodotFetch.onerror.bind(null, id));
+			return id;
+		},
+
+		free: function (id) {
+			const obj = IDHandler.get(id);
+			if (!obj) {
+				return;
+			}
+			IDHandler.remove(id);
+			if (!obj.request) {
+				return;
+			}
+			// Try to abort
+			obj.request.then(function (response) {
+				response.abort();
+			}).catch(function (e) { /* nothing to do */ });
+		},
+
+		read: function (id) {
+			const obj = IDHandler.get(id);
+			if (!obj) {
+				return;
+			}
+			if (obj.reader && !obj.reading) {
+				if (obj.done) {
+					obj.reader = null;
+					return;
+				}
+				obj.reading = true;
+				obj.reader.read().then(GodotFetch.onread.bind(null, id)).catch(GodotFetch.onerror.bind(null, id));
+			}
+		},
+	},
+
+	godot_js_fetch_create__sig: 'iiiiiii',
+	godot_js_fetch_create: function (p_method, p_url, p_headers, p_headers_size, p_body, p_body_size) {
+		const method = GodotRuntime.parseString(p_method);
+		const url = GodotRuntime.parseString(p_url);
+		const headers = GodotRuntime.parseStringArray(p_headers, p_headers_size);
+		const body = p_body_size ? GodotRuntime.heapSlice(HEAP8, p_body, p_body_size) : null;
+		return GodotFetch.create(method, url, headers.map(function (hv) {
+			const idx = hv.indexOf(':');
+			if (idx <= 0) {
+				return [];
+			}
+			return [
+				hv.slice(0, idx).trim(),
+				hv.slice(idx + 1).trim(),
+			];
+		}).filter(function (v) {
+			return v.length === 2;
+		}), body);
+	},
+
+	godot_js_fetch_state_get__sig: 'ii',
+	godot_js_fetch_state_get: function (p_id) {
+		const obj = IDHandler.get(p_id);
+		if (!obj) {
+			return -1;
+		}
+		if (obj.error) {
+			return -1;
+		}
+		if (!obj.response) {
+			return 0;
+		}
+		if (obj.reader) {
+			return 1;
+		}
+		if (obj.done) {
+			return 2;
+		}
+		return -1;
+	},
+
+	godot_js_fetch_http_status_get__sig: 'ii',
+	godot_js_fetch_http_status_get: function (p_id) {
+		const obj = IDHandler.get(p_id);
+		if (!obj || !obj.response) {
+			return 0;
+		}
+		return obj.status;
+	},
+
+	godot_js_fetch_read_headers__sig: 'iiii',
+	godot_js_fetch_read_headers: function (p_id, p_parse_cb, p_ref) {
+		const obj = IDHandler.get(p_id);
+		if (!obj || !obj.response) {
+			return 1;
+		}
+		const cb = GodotRuntime.get_func(p_parse_cb);
+		const arr = [];
+		obj.response.headers.forEach(function (v, h) {
+			arr.push(`${h}:${v}`);
+		});
+		const c_ptr = GodotRuntime.allocStringArray(arr);
+		cb(arr.length, c_ptr, p_ref);
+		GodotRuntime.freeStringArray(c_ptr, arr.length);
+		return 0;
+	},
+
+	godot_js_fetch_read_chunk__sig: 'iiii',
+	godot_js_fetch_read_chunk: function (p_id, p_buf, p_buf_size) {
+		const obj = IDHandler.get(p_id);
+		if (!obj || !obj.response) {
+			return 0;
+		}
+		let to_read = p_buf_size;
+		const chunks = obj.chunks;
+		while (to_read && chunks.length) {
+			const chunk = obj.chunks[0];
+			if (chunk.length > to_read) {
+				GodotRuntime.heapCopy(HEAP8, chunk.slice(0, to_read), p_buf);
+				chunks[0] = chunk.slice(to_read);
+				to_read = 0;
+			} else {
+				GodotRuntime.heapCopy(HEAP8, chunk, p_buf);
+				to_read -= chunk.length;
+				chunks.pop();
+			}
+		}
+		if (!chunks.length) {
+			GodotFetch.read(p_id);
+		}
+		return p_buf_size - to_read;
+	},
+
+	godot_js_fetch_body_length_get__sig: 'ii',
+	godot_js_fetch_body_length_get: function (p_id) {
+		const obj = IDHandler.get(p_id);
+		if (!obj || !obj.response) {
+			return -1;
+		}
+		return obj.bodySize;
+	},
+
+	godot_js_fetch_is_chunked__sig: 'ii',
+	godot_js_fetch_is_chunked: function (p_id) {
+		const obj = IDHandler.get(p_id);
+		if (!obj || !obj.response) {
+			return -1;
+		}
+		return obj.chunked ? 1 : 0;
+	},
+
+	godot_js_fetch_free__sig: 'vi',
+	godot_js_fetch_free: function (id) {
+		GodotFetch.free(id);
+	},
+};
+
+autoAddDeps(GodotFetch, '$GodotFetch');
+mergeInto(LibraryManager.library, GodotFetch);
diff --git a/platform/javascript/js/libs/library_godot_http_request.js b/platform/javascript/js/libs/library_godot_http_request.js
deleted file mode 100644
index 7dc2a2df29..0000000000
--- a/platform/javascript/js/libs/library_godot_http_request.js
+++ /dev/null
@@ -1,142 +0,0 @@
-/*************************************************************************/
-/*  http_request.js                                                      */
-/*************************************************************************/
-/*                       This file is part of:                           */
-/*                           GODOT ENGINE                                */
-/*                      https://godotengine.org                          */
-/*************************************************************************/
-/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
-/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
-/*                                                                       */
-/* Permission is hereby granted, free of charge, to any person obtaining */
-/* a copy of this software and associated documentation files (the       */
-/* "Software"), to deal in the Software without restriction, including   */
-/* without limitation the rights to use, copy, modify, merge, publish,   */
-/* distribute, sublicense, and/or sell copies of the Software, and to    */
-/* permit persons to whom the Software is furnished to do so, subject to */
-/* the following conditions:                                             */
-/*                                                                       */
-/* The above copyright notice and this permission notice shall be        */
-/* included in all copies or substantial portions of the Software.       */
-/*                                                                       */
-/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
-/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
-/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
-/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
-/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
-/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
-/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
-/*************************************************************************/
-
-const GodotHTTPRequest = {
-	$GodotHTTPRequest__deps: ['$GodotRuntime'],
-	$GodotHTTPRequest: {
-		requests: [],
-
-		getUnusedRequestId: function () {
-			const idMax = GodotHTTPRequest.requests.length;
-			for (let potentialId = 0; potentialId < idMax; ++potentialId) {
-				if (GodotHTTPRequest.requests[potentialId] instanceof XMLHttpRequest) {
-					continue;
-				}
-				return potentialId;
-			}
-			GodotHTTPRequest.requests.push(null);
-			return idMax;
-		},
-
-		setupRequest: function (xhr) {
-			xhr.responseType = 'arraybuffer';
-		},
-	},
-
-	godot_xhr_new__sig: 'i',
-	godot_xhr_new: function () {
-		const newId = GodotHTTPRequest.getUnusedRequestId();
-		GodotHTTPRequest.requests[newId] = new XMLHttpRequest();
-		GodotHTTPRequest.setupRequest(GodotHTTPRequest.requests[newId]);
-		return newId;
-	},
-
-	godot_xhr_reset__sig: 'vi',
-	godot_xhr_reset: function (xhrId) {
-		GodotHTTPRequest.requests[xhrId] = new XMLHttpRequest();
-		GodotHTTPRequest.setupRequest(GodotHTTPRequest.requests[xhrId]);
-	},
-
-	godot_xhr_free__sig: 'vi',
-	godot_xhr_free: function (xhrId) {
-		GodotHTTPRequest.requests[xhrId].abort();
-		GodotHTTPRequest.requests[xhrId] = null;
-	},
-
-	godot_xhr_open__sig: 'viiiii',
-	godot_xhr_open: function (xhrId, method, url, p_user, p_password) {
-		const user = p_user > 0 ? GodotRuntime.parseString(p_user) : null;
-		const password = p_password > 0 ? GodotRuntime.parseString(p_password) : null;
-		GodotHTTPRequest.requests[xhrId].open(GodotRuntime.parseString(method), GodotRuntime.parseString(url), true, user, password);
-	},
-
-	godot_xhr_set_request_header__sig: 'viii',
-	godot_xhr_set_request_header: function (xhrId, header, value) {
-		GodotHTTPRequest.requests[xhrId].setRequestHeader(GodotRuntime.parseString(header), GodotRuntime.parseString(value));
-	},
-
-	godot_xhr_send__sig: 'viii',
-	godot_xhr_send: function (xhrId, p_ptr, p_len) {
-		let data = null;
-		if (p_ptr && p_len) {
-			data = GodotRuntime.heapCopy(HEAP8, p_ptr, p_len);
-		}
-		GodotHTTPRequest.requests[xhrId].send(data);
-	},
-
-	godot_xhr_abort__sig: 'vi',
-	godot_xhr_abort: function (xhrId) {
-		GodotHTTPRequest.requests[xhrId].abort();
-	},
-
-	godot_xhr_get_status__sig: 'ii',
-	godot_xhr_get_status: function (xhrId) {
-		return GodotHTTPRequest.requests[xhrId].status;
-	},
-
-	godot_xhr_get_ready_state__sig: 'ii',
-	godot_xhr_get_ready_state: function (xhrId) {
-		return GodotHTTPRequest.requests[xhrId].readyState;
-	},
-
-	godot_xhr_get_response_headers_length__sig: 'ii',
-	godot_xhr_get_response_headers_length: function (xhrId) {
-		const headers = GodotHTTPRequest.requests[xhrId].getAllResponseHeaders();
-		return headers === null ? 0 : GodotRuntime.strlen(headers);
-	},
-
-	godot_xhr_get_response_headers__sig: 'viii',
-	godot_xhr_get_response_headers: function (xhrId, dst, len) {
-		const str = GodotHTTPRequest.requests[xhrId].getAllResponseHeaders();
-		if (str === null) {
-			return;
-		}
-		GodotRuntime.stringToHeap(str, dst, len);
-	},
-
-	godot_xhr_get_response_length__sig: 'ii',
-	godot_xhr_get_response_length: function (xhrId) {
-		const body = GodotHTTPRequest.requests[xhrId].response;
-		return body === null ? 0 : body.byteLength;
-	},
-
-	godot_xhr_get_response__sig: 'viii',
-	godot_xhr_get_response: function (xhrId, dst, len) {
-		let buf = GodotHTTPRequest.requests[xhrId].response;
-		if (buf === null) {
-			return;
-		}
-		buf = new Uint8Array(buf).subarray(0, len);
-		HEAPU8.set(buf, dst);
-	},
-};
-
-autoAddDeps(GodotHTTPRequest, '$GodotHTTPRequest');
-mergeInto(LibraryManager.library, GodotHTTPRequest);
diff --git a/platform/javascript/js/libs/library_godot_javascript_singleton.js b/platform/javascript/js/libs/library_godot_javascript_singleton.js
new file mode 100644
index 0000000000..22ce003cd2
--- /dev/null
+++ b/platform/javascript/js/libs/library_godot_javascript_singleton.js
@@ -0,0 +1,346 @@
+/*************************************************************************/
+/*  library_godot_eval.js                                                */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+const GodotJSWrapper = {
+
+	$GodotJSWrapper__deps: ['$GodotRuntime', '$IDHandler'],
+	$GodotJSWrapper__postset: 'GodotJSWrapper.proxies = new Map();',
+	$GodotJSWrapper: {
+		proxies: null,
+		cb_ret: null,
+
+		MyProxy: function (val) {
+			const id = IDHandler.add(this);
+			GodotJSWrapper.proxies.set(val, id);
+			let refs = 1;
+			this.ref = function () {
+				refs++;
+			};
+			this.unref = function () {
+				refs--;
+				if (refs === 0) {
+					IDHandler.remove(id);
+					GodotJSWrapper.proxies.delete(val);
+				}
+			};
+			this.get_val = function () {
+				return val;
+			};
+			this.get_id = function () {
+				return id;
+			};
+		},
+
+		get_proxied: function (val) {
+			const id = GodotJSWrapper.proxies.get(val);
+			if (id === undefined) {
+				const proxy = new GodotJSWrapper.MyProxy(val);
+				return proxy.get_id();
+			}
+			IDHandler.get(id).ref();
+			return id;
+		},
+
+		get_proxied_value: function (id) {
+			const proxy = IDHandler.get(id);
+			if (proxy === undefined) {
+				return undefined;
+			}
+			return proxy.get_val();
+		},
+
+		variant2js: function (type, val) {
+			switch (type) {
+			case 0:
+				return null;
+			case 1:
+				return !!GodotRuntime.getHeapValue(val, 'i64');
+			case 2:
+				return GodotRuntime.getHeapValue(val, 'i64');
+			case 3:
+				return GodotRuntime.getHeapValue(val, 'double');
+			case 4:
+				return GodotRuntime.parseString(GodotRuntime.getHeapValue(val, '*'));
+			case 21: // OBJECT
+				return GodotJSWrapper.get_proxied_value(GodotRuntime.getHeapValue(val, 'i64'));
+			default:
+				return undefined;
+			}
+		},
+
+		js2variant: function (p_val, p_exchange) {
+			if (p_val === undefined || p_val === null) {
+				return 0; // NIL
+			}
+			const type = typeof (p_val);
+			if (type === 'boolean') {
+				GodotRuntime.setHeapValue(p_exchange, p_val, 'i64');
+				return 1; // BOOL
+			} else if (type === 'number') {
+				if (Number.isInteger(p_val)) {
+					GodotRuntime.setHeapValue(p_exchange, p_val, 'i64');
+					return 2; // INT
+				}
+				GodotRuntime.setHeapValue(p_exchange, p_val, 'double');
+				return 3; // REAL
+			} else if (type === 'string') {
+				const c_str = GodotRuntime.allocString(p_val);
+				GodotRuntime.setHeapValue(p_exchange, c_str, '*');
+				return 4; // STRING
+			}
+			const id = GodotJSWrapper.get_proxied(p_val);
+			GodotRuntime.setHeapValue(p_exchange, id, 'i64');
+			return 21;
+		},
+	},
+
+	godot_js_wrapper_interface_get__sig: 'ii',
+	godot_js_wrapper_interface_get: function (p_name) {
+		const name = GodotRuntime.parseString(p_name);
+		if (typeof (window[name]) !== 'undefined') {
+			return GodotJSWrapper.get_proxied(window[name]);
+		}
+		return 0;
+	},
+
+	godot_js_wrapper_object_get__sig: 'iiii',
+	godot_js_wrapper_object_get: function (p_id, p_exchange, p_prop) {
+		const obj = GodotJSWrapper.get_proxied_value(p_id);
+		if (obj === undefined) {
+			return 0;
+		}
+		if (p_prop) {
+			const prop = GodotRuntime.parseString(p_prop);
+			try {
+				return GodotJSWrapper.js2variant(obj[prop], p_exchange);
+			} catch (e) {
+				GodotRuntime.error(`Error getting variable ${prop} on object`, obj);
+				return 0; // NIL
+			}
+		}
+		return GodotJSWrapper.js2variant(obj, p_exchange);
+	},
+
+	godot_js_wrapper_object_set__sig: 'viiii',
+	godot_js_wrapper_object_set: function (p_id, p_name, p_type, p_exchange) {
+		const obj = GodotJSWrapper.get_proxied_value(p_id);
+		if (obj === undefined) {
+			return;
+		}
+		const name = GodotRuntime.parseString(p_name);
+		try {
+			obj[name] = GodotJSWrapper.variant2js(p_type, p_exchange);
+		} catch (e) {
+			GodotRuntime.error(`Error setting variable ${name} on object`, obj);
+		}
+	},
+
+	godot_js_wrapper_object_call__sig: 'iiiiiiiii',
+	godot_js_wrapper_object_call: function (p_id, p_method, p_args, p_argc, p_convert_callback, p_exchange, p_lock, p_free_lock_callback) {
+		const obj = GodotJSWrapper.get_proxied_value(p_id);
+		if (obj === undefined) {
+			return -1;
+		}
+		const method = GodotRuntime.parseString(p_method);
+		const convert = GodotRuntime.get_func(p_convert_callback);
+		const freeLock = GodotRuntime.get_func(p_free_lock_callback);
+		const args = new Array(p_argc);
+		for (let i = 0; i < p_argc; i++) {
+			const type = convert(p_args, i, p_exchange, p_lock);
+			const lock = GodotRuntime.getHeapValue(p_lock, '*');
+			args[i] = GodotJSWrapper.variant2js(type, p_exchange);
+			if (lock) {
+				freeLock(p_lock, type);
+			}
+		}
+		try {
+			const res = obj[method](...args);
+			return GodotJSWrapper.js2variant(res, p_exchange);
+		} catch (e) {
+			GodotRuntime.error(`Error calling method ${method} on:`, obj, 'error:', e);
+			return -1;
+		}
+	},
+
+	godot_js_wrapper_object_unref__sig: 'vi',
+	godot_js_wrapper_object_unref: function (p_id) {
+		const proxy = IDHandler.get(p_id);
+		if (proxy !== undefined) {
+			proxy.unref();
+		}
+	},
+
+	godot_js_wrapper_create_cb__sig: 'iii',
+	godot_js_wrapper_create_cb: function (p_ref, p_func) {
+		const func = GodotRuntime.get_func(p_func);
+		let id = 0;
+		const cb = function () {
+			if (!GodotJSWrapper.get_proxied_value(id)) {
+				return undefined;
+			}
+			// The callback will store the returned value in this variable via
+			// "godot_js_wrapper_object_set_cb_ret" upon calling the user function.
+			// This is safe! JavaScript is single threaded (and using it in threads is not a good idea anyway).
+			GodotJSWrapper.cb_ret = null;
+			const args = Array.from(arguments);
+			func(p_ref, GodotJSWrapper.get_proxied(args), args.length);
+			const ret = GodotJSWrapper.cb_ret;
+			GodotJSWrapper.cb_ret = null;
+			return ret;
+		};
+		id = GodotJSWrapper.get_proxied(cb);
+		return id;
+	},
+
+	godot_js_wrapper_object_set_cb_ret__sig: 'vii',
+	godot_js_wrapper_object_set_cb_ret: function (p_val_type, p_val_ex) {
+		GodotJSWrapper.cb_ret = GodotJSWrapper.variant2js(p_val_type, p_val_ex);
+	},
+
+	godot_js_wrapper_object_getvar__sig: 'iiii',
+	godot_js_wrapper_object_getvar: function (p_id, p_type, p_exchange) {
+		const obj = GodotJSWrapper.get_proxied_value(p_id);
+		if (obj === undefined) {
+			return -1;
+		}
+		const prop = GodotJSWrapper.variant2js(p_type, p_exchange);
+		if (prop === undefined || prop === null) {
+			return -1;
+		}
+		try {
+			return GodotJSWrapper.js2variant(obj[prop], p_exchange);
+		} catch (e) {
+			GodotRuntime.error(`Error getting variable ${prop} on object`, obj, e);
+			return -1;
+		}
+	},
+
+	godot_js_wrapper_object_setvar__sig: 'iiiiii',
+	godot_js_wrapper_object_setvar: function (p_id, p_key_type, p_key_ex, p_val_type, p_val_ex) {
+		const obj = GodotJSWrapper.get_proxied_value(p_id);
+		if (obj === undefined) {
+			return -1;
+		}
+		const key = GodotJSWrapper.variant2js(p_key_type, p_key_ex);
+		try {
+			obj[key] = GodotJSWrapper.variant2js(p_val_type, p_val_ex);
+			return 0;
+		} catch (e) {
+			GodotRuntime.error(`Error setting variable ${key} on object`, obj);
+			return -1;
+		}
+	},
+
+	godot_js_wrapper_create_object__sig: 'iiiiiiii',
+	godot_js_wrapper_create_object: function (p_object, p_args, p_argc, p_convert_callback, p_exchange, p_lock, p_free_lock_callback) {
+		const name = GodotRuntime.parseString(p_object);
+		if (typeof (window[name]) === 'undefined') {
+			return -1;
+		}
+		const convert = GodotRuntime.get_func(p_convert_callback);
+		const freeLock = GodotRuntime.get_func(p_free_lock_callback);
+		const args = new Array(p_argc);
+		for (let i = 0; i < p_argc; i++) {
+			const type = convert(p_args, i, p_exchange, p_lock);
+			const lock = GodotRuntime.getHeapValue(p_lock, '*');
+			args[i] = GodotJSWrapper.variant2js(type, p_exchange);
+			if (lock) {
+				freeLock(p_lock, type);
+			}
+		}
+		try {
+			const res = new window[name](...args);
+			return GodotJSWrapper.js2variant(res, p_exchange);
+		} catch (e) {
+			GodotRuntime.error(`Error calling constructor ${name} with args:`, args, 'error:', e);
+			return -1;
+		}
+	},
+};
+
+autoAddDeps(GodotJSWrapper, '$GodotJSWrapper');
+mergeInto(LibraryManager.library, GodotJSWrapper);
+
+const GodotEval = {
+	godot_js_eval__deps: ['$GodotRuntime'],
+	godot_js_eval__sig: 'iiiiiii',
+	godot_js_eval: function (p_js, p_use_global_ctx, p_union_ptr, p_byte_arr, p_byte_arr_write, p_callback) {
+		const js_code = GodotRuntime.parseString(p_js);
+		let eval_ret = null;
+		try {
+			if (p_use_global_ctx) {
+				// indirect eval call grants global execution context
+				const global_eval = eval; // eslint-disable-line no-eval
+				eval_ret = global_eval(js_code);
+			} else {
+				eval_ret = eval(js_code); // eslint-disable-line no-eval
+			}
+		} catch (e) {
+			GodotRuntime.error(e);
+		}
+
+		switch (typeof eval_ret) {
+		case 'boolean':
+			GodotRuntime.setHeapValue(p_union_ptr, eval_ret, 'i32');
+			return 1; // BOOL
+
+		case 'number':
+			GodotRuntime.setHeapValue(p_union_ptr, eval_ret, 'double');
+			return 3; // REAL
+
+		case 'string':
+			GodotRuntime.setHeapValue(p_union_ptr, GodotRuntime.allocString(eval_ret), '*');
+			return 4; // STRING
+
+		case 'object':
+			if (eval_ret === null) {
+				break;
+			}
+
+			if (ArrayBuffer.isView(eval_ret) && !(eval_ret instanceof Uint8Array)) {
+				eval_ret = new Uint8Array(eval_ret.buffer);
+			} else if (eval_ret instanceof ArrayBuffer) {
+				eval_ret = new Uint8Array(eval_ret);
+			}
+			if (eval_ret instanceof Uint8Array) {
+				const func = GodotRuntime.get_func(p_callback);
+				const bytes_ptr = func(p_byte_arr, p_byte_arr_write, eval_ret.length);
+				HEAPU8.set(eval_ret, bytes_ptr);
+				return 20; // POOL_BYTE_ARRAY
+			}
+			break;
+
+			// no default
+		}
+		return 0; // NIL
+	},
+};
+
+mergeInto(LibraryManager.library, GodotEval);
diff --git a/platform/javascript/js/libs/library_godot_os.js b/platform/javascript/js/libs/library_godot_os.js
index 0f189b013c..5aa750757c 100644
--- a/platform/javascript/js/libs/library_godot_os.js
+++ b/platform/javascript/js/libs/library_godot_os.js
@@ -59,6 +59,8 @@ const GodotConfig = {
 		canvas: null,
 		locale: 'en',
 		canvas_resize_policy: 2, // Adaptive
+		virtual_keyboard: false,
+		persistent_drops: false,
 		on_execute: null,
 		on_exit: null,
 
@@ -66,8 +68,13 @@ const GodotConfig = {
 			GodotConfig.canvas_resize_policy = p_opts['canvasResizePolicy'];
 			GodotConfig.canvas = p_opts['canvas'];
 			GodotConfig.locale = p_opts['locale'] || GodotConfig.locale;
+			GodotConfig.virtual_keyboard = p_opts['virtualKeyboard'];
+			GodotConfig.persistent_drops = !!p_opts['persistentDrops'];
 			GodotConfig.on_execute = p_opts['onExecute'];
 			GodotConfig.on_exit = p_opts['onExit'];
+			if (p_opts['focusCanvas']) {
+				GodotConfig.canvas.focus();
+			}
 		},
 
 		locate_file: function (file) {
@@ -77,6 +84,8 @@ const GodotConfig = {
 			GodotConfig.canvas = null;
 			GodotConfig.locale = 'en';
 			GodotConfig.canvas_resize_policy = 2;
+			GodotConfig.virtual_keyboard = false;
+			GodotConfig.persistent_drops = false;
 			GodotConfig.on_execute = null;
 			GodotConfig.on_exit = null;
 		},
@@ -298,6 +307,23 @@ const GodotOS = {
 	godot_js_os_hw_concurrency_get: function () {
 		return navigator.hardwareConcurrency || 1;
 	},
+
+	godot_js_os_download_buffer__sig: 'viiii',
+	godot_js_os_download_buffer: function (p_ptr, p_size, p_name, p_mime) {
+		const buf = GodotRuntime.heapSlice(HEAP8, p_ptr, p_size);
+		const name = GodotRuntime.parseString(p_name);
+		const mime = GodotRuntime.parseString(p_mime);
+		const blob = new Blob([buf], { type: mime });
+		const url = window.URL.createObjectURL(blob);
+		const a = document.createElement('a');
+		a.href = url;
+		a.download = name;
+		a.style.display = 'none';
+		document.body.appendChild(a);
+		a.click();
+		a.remove();
+		window.URL.revokeObjectURL(url);
+	},
 };
 
 autoAddDeps(GodotOS, '$GodotOS');
diff --git a/platform/javascript/js/libs/library_godot_runtime.js b/platform/javascript/js/libs/library_godot_runtime.js
index 7e36ff8ab5..3da1ed8f06 100644
--- a/platform/javascript/js/libs/library_godot_runtime.js
+++ b/platform/javascript/js/libs/library_godot_runtime.js
@@ -72,11 +72,16 @@ const GodotRuntime = {
 			return p_heap.subarray(p_ptr / bytes, p_ptr / bytes + p_len);
 		},
 
-		heapCopy: function (p_heap, p_ptr, p_len) {
+		heapSlice: function (p_heap, p_ptr, p_len) {
 			const bytes = p_heap.BYTES_PER_ELEMENT;
 			return p_heap.slice(p_ptr / bytes, p_ptr / bytes + p_len);
 		},
 
+		heapCopy: function (p_dst, p_src, p_ptr) {
+			const bytes = p_src.BYTES_PER_ELEMENT;
+			return p_dst.set(p_src, p_ptr / bytes);
+		},
+
 		/*
 		 * Strings
 		 */
@@ -84,6 +89,15 @@ const GodotRuntime = {
 			return UTF8ToString(p_ptr); // eslint-disable-line no-undef
 		},
 
+		parseStringArray: function (p_ptr, p_size) {
+			const strings = [];
+			const ptrs = GodotRuntime.heapSub(HEAP32, p_ptr, p_size); // TODO wasm64
+			ptrs.forEach(function (ptr) {
+				strings.push(GodotRuntime.parseString(ptr));
+			});
+			return strings;
+		},
+
 		strlen: function (p_str) {
 			return lengthBytesUTF8(p_str); // eslint-disable-line no-undef
 		},