diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2891bee..3172552 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -365,47 +365,17 @@ if(EMSCRIPTEN)
     target_link_libraries(WASM::WASM INTERFACE "-s WASM_BIGINT")
     add_definitions(-s DISABLE_EXCEPTION_CATCHING=0)
 
-    # Export functions to Javascript.
-    target_link_libraries(WASM::WASM INTERFACE "-s EXPORTED_FUNCTIONS='[\"_main\", \"_em_openttd_add_server\"]' -s EXPORTED_RUNTIME_METHODS='[\"cwrap\"]'")
-
-    # Preload all the files we generate during build.
-    # As we do not compile with FreeType / FontConfig, we also have no way to
-    # render several languages (like Chinese, ..), so where do you draw the
-    # line what languages to include and which not? In the end, especially as
-    # the more languages you add the slower downloading becomes, we decided to
-    # only ship the English language.
-    target_link_libraries(WASM::WASM INTERFACE "--preload-file ${CMAKE_BINARY_DIR}/baseset@/baseset")
-    target_link_libraries(WASM::WASM INTERFACE "--preload-file ${CMAKE_BINARY_DIR}/lang/english.lng@/lang/english.lng")
-    target_link_libraries(WASM::WASM INTERFACE "--preload-file ${CMAKE_SOURCE_DIR}/bin/ai@/ai")
-    target_link_libraries(WASM::WASM INTERFACE "--preload-file ${CMAKE_SOURCE_DIR}/bin/game@/game")
-    # Documentation files for the in-game text file viewer
-    target_link_libraries(WASM::WASM INTERFACE "--preload-file ${CMAKE_SOURCE_DIR}/README.md@/README.md")
-    target_link_libraries(WASM::WASM INTERFACE "--preload-file ${CMAKE_SOURCE_DIR}/CREDITS.md@/CREDITS.md")
-    target_link_libraries(WASM::WASM INTERFACE "--preload-file ${CMAKE_SOURCE_DIR}/CONTRIBUTING.md@/CONTRIBUTING.md")
-    target_link_libraries(WASM::WASM INTERFACE "--preload-file ${CMAKE_SOURCE_DIR}/COPYING.md@/COPYING.md")
-    target_link_libraries(WASM::WASM INTERFACE "--preload-file ${CMAKE_SOURCE_DIR}/known-bugs.md@/known-bugs.md")
-    target_link_libraries(WASM::WASM INTERFACE "--preload-file ${CMAKE_SOURCE_DIR}/changelog.md@/changelog.md")
-    target_link_libraries(WASM::WASM INTERFACE "--preload-file ${CMAKE_SOURCE_DIR}/docs/admin_network.md@/docs/admin_network.md")
-    target_link_libraries(WASM::WASM INTERFACE "--preload-file ${CMAKE_SOURCE_DIR}/docs/debugging_desyncs.md@/docs/debugging_desyncs.md")
-    target_link_libraries(WASM::WASM INTERFACE "--preload-file ${CMAKE_SOURCE_DIR}/docs/desync.md@/docs/desync.md")
-    target_link_libraries(WASM::WASM INTERFACE "--preload-file ${CMAKE_SOURCE_DIR}/docs/directory_structure.md@/docs/directory_structure.md")
-    target_link_libraries(WASM::WASM INTERFACE "--preload-file ${CMAKE_SOURCE_DIR}/docs/eints.md@/docs/eints.md")
-    target_link_libraries(WASM::WASM INTERFACE "--preload-file ${CMAKE_SOURCE_DIR}/docs/fonts.md@/docs/fonts.md")
-    target_link_libraries(WASM::WASM INTERFACE "--preload-file ${CMAKE_SOURCE_DIR}/docs/linkgraph.md@/docs/linkgraph.md")
-    target_link_libraries(WASM::WASM INTERFACE "--preload-file ${CMAKE_SOURCE_DIR}/docs/logging_and_performance_metrics.md@/docs/logging_and_performance_metrics.md")
-    target_link_libraries(WASM::WASM INTERFACE "--preload-file ${CMAKE_SOURCE_DIR}/docs/multiplayer.md@/docs/multiplayer.md")
-    target_link_libraries(WASM::WASM INTERFACE "--preload-file ${CMAKE_SOURCE_DIR}/docs/savegame_format.md@/docs/savegame_format.md")
-    target_link_libraries(WASM::WASM INTERFACE "--preload-file ${CMAKE_SOURCE_DIR}/docs/symbol_server.md@/docs/symbol_server.md")
-
-    # We use IDBFS for persistent storage.
-    target_link_libraries(WASM::WASM INTERFACE "-lidbfs.js")
-
-    # Use custom pre-js and shell.html.
+    # Export functions to Javascript. The play page runs main() once it has
+    # written the game's files, and the player's own files are kept by the page
+    # rather than in an IndexedDB mount.
+    target_link_libraries(WASM::WASM INTERFACE "-s EXPORTED_FUNCTIONS='[\"_main\", \"_em_openttd_add_server\"]' -s EXPORTED_RUNTIME_METHODS='[\"cwrap\", \"FS\", \"callMain\"]'")
+    target_link_libraries(WASM::WASM INTERFACE "-s INVOKE_RUN=0 -s FORCE_FILESYSTEM=1 -s ENVIRONMENT=web")
+
+    # Use custom pre-js.
     target_link_libraries(WASM::WASM INTERFACE "--pre-js ${CMAKE_SOURCE_DIR}/os/emscripten/pre.js")
-    target_link_libraries(WASM::WASM INTERFACE "--shell-file ${CMAKE_SOURCE_DIR}/os/emscripten/shell.html")
 
-    # Build the .html (which builds the .js, .wasm, and .data too).
-    set_target_properties(openttd PROPERTIES SUFFIX ".html")
+    # Build the .js and .wasm.
+    set_target_properties(openttd PROPERTIES SUFFIX ".js")
     target_link_libraries(openttd WASM::WASM)
 endif()
 
diff --git a/os/emscripten/pre.js b/os/emscripten/pre.js
index 8e46ae3..d9fe6b7 100644
--- a/os/emscripten/pre.js
+++ b/os/emscripten/pre.js
@@ -1,89 +1,8 @@
-Module.arguments.push('-mnull', '-snull', '-vsdl');
-Module['websocket'] = { url: function(host, port, proto) {
-    /* openttd.org hosts a WebSocket proxy for the content service. */
-    if (host == "content.openttd.org" && port == 3978 && proto == "tcp") {
-        return "wss://bananas-server.openttd.org/";
-    }
-
-    /* Everything else just tries to make a default WebSocket connection.
-     * If you run your own server you can setup your own WebSocket proxy in
-     * front of it and let people connect to your server via the proxy. You
-     * are best to add another "if" statement as above for this. */
-
-    if (location.protocol === 'https:') {
-        /* Insecure WebSockets do not work over HTTPS, so we force
-         * secure ones. */
-        return 'wss://';
-    } else {
-        /* Use the default provided by Emscripten. */
-        return null;
-    }
-} };
-
-Module.preRun.push(function() {
-    personal_dir = '/home/web_user/.openttd';
-    content_download_dir = personal_dir + '/content_download'
-
-    /* Because of the "-c" above, all user-data is stored in /user_data. */
-    FS.mkdir(personal_dir);
-    FS.mount(IDBFS, {}, personal_dir);
-
-    Module.addRunDependency('syncfs');
-    FS.syncfs(true, function (err) {
-        Module.removeRunDependency('syncfs');
-    });
-
-    window.openttd_syncfs_shown_warning = false;
-    window.openttd_syncfs = function(callback) {
-        /* Copy the virtual FS to the persistent storage. */
-        FS.syncfs(false, function (err) {
-            /* On first time, warn the user about the volatile behaviour of
-             * persistent storage. */
-            if (!window.openttd_syncfs_shown_warning) {
-                window.openttd_syncfs_shown_warning = true;
-                Module.onWarningFs();
-            }
-
-            if (callback) callback();
-        });
-    }
-
-    window.openttd_exit = function() {
-        window.openttd_syncfs(Module.onExit);
-    }
-
-    window.openttd_abort = function() {
-        window.openttd_syncfs(Module.onAbort);
-    }
-
-    window.openttd_bootstrap = function(current, total) {
-        Module.onBootstrap(current, total);
-    }
-
-    window.openttd_bootstrap_failed = function() {
-        Module.onBootstrapFailed();
-    }
-
-    window.openttd_bootstrap_reload = function() {
-        window.openttd_syncfs(function() {
-            Module.onBootstrapReload();
-            setTimeout(function() {
-                location.reload();
-            }, 1000);
-        });
-    }
-
-    window.openttd_server_list = function() {
-        add_server = Module.cwrap("em_openttd_add_server", null, ["string"]);
-
-        /* Add servers that support WebSocket here. Examples:
-         *  add_server("localhost");
-         *  add_server("localhost:3979");
-         *  add_server("127.0.0.1:3979");
-         *  add_server("[::1]:3979");
-         */
-    }
-
+/* For wasmga.me: the play page writes the game's files before it runs main(),
+ * keeps the player's own files itself, and passes the drivers as arguments.
+ * There is no IndexedDB mount, network play or page to show on exit. */
+Module['preRun'] = Module['preRun'] || [];
+Module['preRun'].push(function() {
     var leftButtonDown = false;
     document.addEventListener("mousedown", e => {
         if (e.button == 0) {
@@ -99,28 +18,14 @@ Module.preRun.push(function() {
         const url_string = UTF8ToString(url, url_len);
         function openWindow() {
             document.removeEventListener("mouseup", openWindow);
-            window.open(url_string, '_blank');
+            window.open(url_string, '_blank', 'noopener');
         }
         /* Trying to open the URL while the mouse is down results in the button getting stuck, so wait for the
-         * mouse to be released before opening it. However, when OpenTTD is lagging, the mouse can get released
-         * before the button click even registers, so check for that, and open the URL immediately if that's the
-         * case. */
+         * mouse to be released before opening it. */
         if (leftButtonDown) {
             document.addEventListener("mouseup", openWindow);
         } else {
             openWindow();
         }
     }
-
-    /* https://github.com/emscripten-core/emscripten/pull/12995 implements this
-    * properly. Till that time, we use a polyfill. */
-   SOCKFS.websocket_sock_ops.createPeer_ = SOCKFS.websocket_sock_ops.createPeer;
-   SOCKFS.websocket_sock_ops.createPeer = function(sock, addr, port)
-   {
-       let func = Module['websocket']['url'];
-       Module['websocket']['url'] = func(addr, port, (sock.type == 2) ? 'udp' : 'tcp');
-       let ret = SOCKFS.websocket_sock_ops.createPeer_(sock, addr, port);
-       Module['websocket']['url'] = func;
-       return ret;
-   }
 });
diff --git a/src/ai/ai_gui.cpp b/src/ai/ai_gui.cpp
index bdea793..0fed816 100644
--- a/src/ai/ai_gui.cpp
+++ b/src/ai/ai_gui.cpp
@@ -65,7 +65,9 @@ static constexpr std::initializer_list<NWidgetPart> _nested_ai_config_widgets =
 			NWidget(NWID_HORIZONTAL), SetPIP(0, WidgetDimensions::unscaled.hsep_wide, 0),
 				NWidget(NWID_VERTICAL, NWidContainerFlag::EqualSize),
 					NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_AIC_CHANGE), SetFill(1, 1), SetStringTip(STR_AI_CONFIG_CHANGE_AI, STR_AI_CONFIG_CHANGE_TOOLTIP),
+#ifndef __EMSCRIPTEN__
 					NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_AIC_CONTENT_DOWNLOAD), SetFill(1, 1), SetStringTip(STR_INTRO_ONLINE_CONTENT, STR_INTRO_TOOLTIP_ONLINE_CONTENT),
+#endif
 				EndContainer(),
 				NWidget(NWID_VERTICAL, NWidContainerFlag::EqualSize),
 					NWidget(NWID_HORIZONTAL, NWidContainerFlag::EqualSize),
diff --git a/src/fios_gui.cpp b/src/fios_gui.cpp
index 97a6a72..ea50e94 100644
--- a/src/fios_gui.cpp
+++ b/src/fios_gui.cpp
@@ -115,7 +115,9 @@ static constexpr std::initializer_list<NWidgetPart> _nested_load_dialog_widgets
 		NWidget(NWID_VERTICAL),
 			NWidget(WWT_PANEL, COLOUR_GREY, WID_SL_DETAILS), SetResize(1, 1), SetFill(1, 1),
 			EndContainer(),
+#ifndef __EMSCRIPTEN__
 			NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_SL_MISSING_NEWGRFS), SetStringTip(STR_NEWGRF_SETTINGS_FIND_MISSING_CONTENT_BUTTON, STR_NEWGRF_SETTINGS_FIND_MISSING_CONTENT_TOOLTIP), SetFill(1, 0), SetResize(1, 0),
+#endif
 			NWidget(NWID_HORIZONTAL),
 				NWidget(NWID_HORIZONTAL, NWidContainerFlag::EqualSize),
 					NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_SL_NEWGRF_INFO), SetStringTip(STR_MAPGEN_NEWGRF_SETTINGS, STR_MAPGEN_NEWGRF_SETTINGS_TOOLTIP), SetFill(1, 0), SetResize(1, 0),
@@ -166,8 +168,10 @@ static constexpr std::initializer_list<NWidgetPart> _nested_load_heightmap_dialo
 	EndContainer(),
 	/* Online Content and Load button */
 	NWidget(NWID_HORIZONTAL, NWidContainerFlag::EqualSize),
+#ifndef __EMSCRIPTEN__
 		NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_SL_CONTENT_DOWNLOAD), SetResize(1, 0), SetFill(1, 0),
 				SetStringTip(STR_INTRO_ONLINE_CONTENT, STR_INTRO_TOOLTIP_ONLINE_CONTENT),
+#endif
 		NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_SL_LOAD_BUTTON), SetResize(1, 0), SetFill(1, 0),
 				SetStringTip(STR_SAVELOAD_LOAD_BUTTON, STR_SAVELOAD_LOAD_HEIGHTMAP_TOOLTIP),
 		NWidget(WWT_RESIZEBOX, COLOUR_GREY),
@@ -400,7 +404,11 @@ public:
 		this->filename_editbox.ok_button = WID_SL_SAVE_GAME;
 
 		this->CreateNestedTree();
+#ifndef __EMSCRIPTEN__
 		if (this->fop == SLO_LOAD && this->abstract_filetype == FT_SAVEGAME) {
+#else
+		{
+#endif
 			this->GetWidget<NWidgetStacked>(WID_SL_CONTENT_DOWNLOAD_SEL)->SetDisplayedPlane(SZSP_HORIZONTAL);
 		}
 
@@ -930,8 +938,10 @@ public:
 						}
 						this->SetWidgetDisabledState(WID_SL_LOAD_BUTTON, disabled);
 						this->SetWidgetDisabledState(WID_SL_NEWGRF_INFO, !_load_check_data.HasNewGrfs());
+#ifndef __EMSCRIPTEN__
 						this->SetWidgetDisabledState(WID_SL_MISSING_NEWGRFS,
 								!_load_check_data.HasNewGrfs() || _load_check_data.grf_compatibility == GLC_ALL_GOOD);
+#endif
 						break;
 					}
 
diff --git a/src/game/game_gui.cpp b/src/game/game_gui.cpp
index b5df0f8..839a0d3 100644
--- a/src/game/game_gui.cpp
+++ b/src/game/game_gui.cpp
@@ -54,7 +54,9 @@ static constexpr std::initializer_list<NWidgetPart> _nested_gs_config_widgets =
 			NWidget(NWID_HORIZONTAL), SetPIP(0, WidgetDimensions::unscaled.hsep_wide, 0),
 				NWidget(NWID_VERTICAL, NWidContainerFlag::EqualSize),
 					NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_GSC_CHANGE), SetFill(1, 1), SetResize(1, 0), SetStringTip(STR_AI_CONFIG_CHANGE_GAMESCRIPT, STR_AI_CONFIG_CHANGE_TOOLTIP),
+#ifndef __EMSCRIPTEN__
 					NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_GSC_CONTENT_DOWNLOAD), SetFill(1, 1), SetResize(1, 0), SetStringTip(STR_INTRO_ONLINE_CONTENT, STR_INTRO_TOOLTIP_ONLINE_CONTENT),
+#endif
 				EndContainer(),
 				NWidget(NWID_VERTICAL, NWidContainerFlag::EqualSize),
 					NWidget(NWID_HORIZONTAL, NWidContainerFlag::EqualSize),
diff --git a/src/intro_gui.cpp b/src/intro_gui.cpp
index d441474..1cbde29 100644
--- a/src/intro_gui.cpp
+++ b/src/intro_gui.cpp
@@ -356,10 +356,12 @@ static constexpr std::initializer_list<NWidgetPart> _nested_select_game_widgets
 				NWidget(WWT_PUSHIMGTEXTBTN, COLOUR_ORANGE, WID_SGI_HIGHSCORE), SetToolbarMinimalSize(1), SetSpriteStringTip(SPR_IMG_COMPANY_LEAGUE, STR_INTRO_HIGHSCORE, STR_INTRO_TOOLTIP_HIGHSCORE), SetAlignment(SA_LEFT | SA_VERT_CENTER), SetFill(1, 0),
 			EndContainer(),
 
+#ifndef __EMSCRIPTEN__
 			/* Multi player */
 			NWidget(NWID_VERTICAL), SetPIP(0, WidgetDimensions::unscaled.vsep_normal, 0),
 				NWidget(WWT_PUSHIMGTEXTBTN, COLOUR_ORANGE, WID_SGI_PLAY_NETWORK), SetToolbarMinimalSize(1), SetSpriteStringTip(SPR_IMG_COMPANY_GENERAL, STR_INTRO_MULTIPLAYER, STR_INTRO_TOOLTIP_MULTIPLAYER), SetAlignment(SA_LEFT | SA_VERT_CENTER), SetFill(1, 0),
 			EndContainer(),
+#endif
 
 			NWidget(NWID_SELECTION, INVALID_COLOUR, WID_SGI_BASESET_SELECTION),
 				NWidget(NWID_VERTICAL),
@@ -376,14 +378,18 @@ static constexpr std::initializer_list<NWidgetPart> _nested_select_game_widgets
 			/* Other */
 			NWidget(NWID_VERTICAL), SetPIP(0, WidgetDimensions::unscaled.vsep_normal, 0),
 				NWidget(WWT_PUSHIMGTEXTBTN, COLOUR_ORANGE, WID_SGI_OPTIONS), SetToolbarMinimalSize(1), SetSpriteStringTip(SPR_IMG_SETTINGS, STR_INTRO_GAME_OPTIONS, STR_INTRO_TOOLTIP_GAME_OPTIONS), SetAlignment(SA_LEFT | SA_VERT_CENTER), SetFill(1, 0),
+#ifndef __EMSCRIPTEN__
 				NWidget(WWT_PUSHIMGTEXTBTN, COLOUR_ORANGE, WID_SGI_CONTENT_DOWNLOAD), SetToolbarMinimalSize(1), SetSpriteStringTip(SPR_IMG_SHOW_VEHICLES, STR_INTRO_ONLINE_CONTENT, STR_INTRO_TOOLTIP_ONLINE_CONTENT), SetAlignment(SA_LEFT | SA_VERT_CENTER), SetFill(1, 0),
+#endif
 				NWidget(WWT_PUSHIMGTEXTBTN, COLOUR_ORANGE, WID_SGI_EDIT_SCENARIO), SetToolbarMinimalSize(1), SetSpriteStringTip(SPR_IMG_SMALLMAP, STR_INTRO_SCENARIO_EDITOR, STR_INTRO_TOOLTIP_SCENARIO_EDITOR), SetAlignment(SA_LEFT | SA_VERT_CENTER), SetFill(1, 0),
 				NWidget(WWT_PUSHIMGTEXTBTN, COLOUR_ORANGE, WID_SGI_HELP), SetToolbarMinimalSize(1), SetSpriteStringTip(SPR_IMG_QUERY, STR_INTRO_HELP, STR_INTRO_TOOLTIP_HELP), SetAlignment(SA_LEFT | SA_VERT_CENTER), SetFill(1, 0),
 			EndContainer(),
 
+#ifndef __EMSCRIPTEN__
 			NWidget(NWID_VERTICAL),
 				NWidget(WWT_PUSHTXTBTN, COLOUR_ORANGE, WID_SGI_EXIT), SetToolbarMinimalSize(1), SetStringTip(STR_INTRO_QUIT, STR_INTRO_TOOLTIP_QUIT),
 			EndContainer(),
+#endif
 		EndContainer(),
 	EndContainer(),
 };
diff --git a/src/music/fluidsynth.cpp b/src/music/fluidsynth.cpp
index b46e4c2..e7da539 100644
--- a/src/music/fluidsynth.cpp
+++ b/src/music/fluidsynth.cpp
@@ -82,6 +82,12 @@ std::optional<std::string_view> MusicDriver_FluidSynth::Start(const StringList &
 	Debug(driver, 1, "Fluidsynth: sf {}", sfont_name.has_value() ? *sfont_name : "(null)");
 
 	/* Create the settings. */
+#ifdef __EMSCRIPTEN__
+	/* Keep the synth's warnings about the songs out of the page's console. */
+	fluid_set_log_function(FLUID_WARN, nullptr, nullptr);
+	fluid_set_log_function(FLUID_INFO, nullptr, nullptr);
+	fluid_set_log_function(FLUID_DBG, nullptr, nullptr);
+#endif
 	_midi.settings = new_fluid_settings();
 	if (_midi.settings == nullptr) return "Could not create midi settings";
 
diff --git a/src/network/network_survey.h b/src/network/network_survey.h
index 6d39de6..954d11f 100644
--- a/src/network/network_survey.h
+++ b/src/network/network_survey.h
@@ -36,7 +36,12 @@ public:
 
 	constexpr static bool IsSurveyPossible()
 	{
+#ifdef __EMSCRIPTEN__
+		/* Single player only: nothing is sent from the web build. */
+		return false;
+#else
 		return true;
+#endif
 	}
 
 private:
diff --git a/src/newgrf_gui.cpp b/src/newgrf_gui.cpp
index e089832..486255c 100644
--- a/src/newgrf_gui.cpp
+++ b/src/newgrf_gui.cpp
@@ -1285,8 +1285,10 @@ struct NewGRFWindow : public Window, NewGRFScanCallback {
 			text = STR_INTRO_ONLINE_CONTENT;
 			tool_tip = STR_INTRO_TOOLTIP_ONLINE_CONTENT;
 		}
+#ifndef __EMSCRIPTEN__
 		this->GetWidget<NWidgetCore>(WID_NS_CONTENT_DOWNLOAD)->SetStringTip(text, tool_tip);
 		this->GetWidget<NWidgetCore>(WID_NS_CONTENT_DOWNLOAD2)->SetStringTip(text, tool_tip);
+#endif
 
 		this->SetWidgetDisabledState(WID_NS_PRESET_SAVE, has_missing);
 	}
@@ -1792,8 +1794,10 @@ static constexpr std::initializer_list<NWidgetPart> _nested_newgrf_actives_widge
 				NWidget(NWID_VERTICAL, NWidContainerFlag::EqualSize),
 					NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_NS_RESCAN_FILES2), SetFill(1, 0), SetResize(1, 0),
 							SetStringTip(STR_NEWGRF_SETTINGS_RESCAN_FILES, STR_NEWGRF_SETTINGS_RESCAN_FILES_TOOLTIP),
+#ifndef __EMSCRIPTEN__
 					NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_NS_CONTENT_DOWNLOAD2), SetFill(1, 0), SetResize(1, 0),
 							SetStringTip(STR_INTRO_ONLINE_CONTENT, STR_INTRO_TOOLTIP_ONLINE_CONTENT),
+#endif
 				EndContainer(),
 			EndContainer(),
 		EndContainer(),
@@ -1826,8 +1830,10 @@ static constexpr std::initializer_list<NWidgetPart> _nested_newgrf_availables_wi
 			NWidget(NWID_VERTICAL),
 				NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_NS_RESCAN_FILES), SetFill(1, 0), SetResize(1, 0),
 						SetStringTip(STR_NEWGRF_SETTINGS_RESCAN_FILES, STR_NEWGRF_SETTINGS_RESCAN_FILES_TOOLTIP),
+#ifndef __EMSCRIPTEN__
 				NWidget(WWT_PUSHTXTBTN, COLOUR_YELLOW, WID_NS_CONTENT_DOWNLOAD), SetFill(1, 0), SetResize(1, 0),
 						SetStringTip(STR_INTRO_ONLINE_CONTENT, STR_INTRO_TOOLTIP_ONLINE_CONTENT),
+#endif
 			EndContainer(),
 		EndContainer(),
 	EndContainer(),
diff --git a/src/openttd.cpp b/src/openttd.cpp
index 7d585b0..79dd901 100644
--- a/src/openttd.cpp
+++ b/src/openttd.cpp
@@ -91,6 +91,7 @@
 #ifdef __EMSCRIPTEN__
 #	include <emscripten.h>
 #	include <emscripten/html5.h>
+#	include <filesystem>
 #endif
 
 #include "safeguards.h"
@@ -816,6 +817,9 @@ int openttd_main(std::span<std::string_view> arguments)
 
 void HandleExitGameRequest()
 {
+#ifdef __EMSCRIPTEN__
+	return;
+#endif
 	if (_game_mode == GM_MENU || _game_mode == GM_BOOTSTRAP) { // do not ask to quit on the main screen
 		_exit_game = true;
 	} else if (_settings_client.gui.autosave_on_exit) {
@@ -1333,8 +1337,61 @@ bool RequestNewGRFScan(NewGRFScanCallback *callback)
 	return true;
 }
 
+#ifdef __EMSCRIPTEN__
+/* The play page's hooks: the Resume snapshot, and writing the player's files
+ * before the page goes (the game never quits, so it would not write them). */
+static bool _wg_snapshot_wanted = false;
+static bool _wg_restore_wanted = false;
+static bool _wg_files_wanted = false;
+static int _wg_snapshot_count = 0;
+
+extern "C" {
+/** Asks for the game in progress in /wg/snapshot.sav, written at the top of the next game loop; none on the title screen or in the editor. */
+EMSCRIPTEN_KEEPALIVE void wg_request_snapshot() { _wg_snapshot_wanted = true; }
+/** Goes up each time a snapshot is written (or found to be none). */
+EMSCRIPTEN_KEEPALIVE int wg_snapshot_count() { return _wg_snapshot_count; }
+/** Loads /wg/restore.sav on the next game loop. */
+EMSCRIPTEN_KEEPALIVE void wg_restore() { _wg_restore_wanted = true; }
+/** Writes the settings, hotkeys, window sizes and high scores on the next game loop. */
+EMSCRIPTEN_KEEPALIVE void wg_save_files() { _wg_files_wanted = true; }
+}
+
+static void WgPageRequests()
+{
+	if (_wg_files_wanted) {
+		_wg_files_wanted = false;
+		SaveToConfig();
+		SaveHotkeysToConfig();
+		WindowDesc::SaveToConfig();
+		SaveToHighScore();
+	}
+	if (_wg_restore_wanted) {
+		_wg_restore_wanted = false;
+		_file_to_saveload.name = "/wg/restore.sav";
+		_file_to_saveload.SetMode(FIOS_TYPE_FILE, SLO_LOAD);
+		_switch_mode = SM_LOAD_GAME;
+		return;
+	}
+	if (_wg_snapshot_wanted && _switch_mode == SM_NONE) {
+		_wg_snapshot_wanted = false;
+		std::filesystem::remove("/wg/snapshot.sav");
+		if (_game_mode == GM_NORMAL && !_networking) {
+			/* Quick to write, as the page asks every few seconds. */
+			std::string format = _savegame_format;
+			_savegame_format = "zlib:1";
+			SaveOrLoad("/wg/snapshot.sav", SLO_SAVE, DFT_GAME_FILE, NO_DIRECTORY, false);
+			_savegame_format = format;
+		}
+		_wg_snapshot_count++;
+	}
+}
+#endif
+
 void GameLoop()
 {
+#ifdef __EMSCRIPTEN__
+	WgPageRequests();
+#endif
 	if (_game_mode == GM_BOOTSTRAP) {
 		/* Check for UDP stuff */
 		if (_network_available) NetworkBackgroundLoop();
diff --git a/src/settings_gui.cpp b/src/settings_gui.cpp
index 70e54fc..ce19ac9 100644
--- a/src/settings_gui.cpp
+++ b/src/settings_gui.cpp
@@ -446,6 +446,10 @@ struct GameOptionsWindow : Window {
 		this->SetTab(GameOptionsWindow::active_tab);
 
 		if constexpr (!NetworkSurveyHandler::IsSurveyPossible()) this->GetWidget<NWidgetStacked>(WID_GO_SURVEY_SEL)->SetDisplayedPlane(SZSP_NONE);
+#ifdef __EMSCRIPTEN__
+		/* The page sizes the game and owns full screen. */
+		this->GetWidget<NWidgetStacked>(WID_GO_DISPLAY_SEL)->SetDisplayedPlane(SZSP_NONE);
+#endif
 	}
 
 	void OnInit() override
@@ -773,7 +777,12 @@ struct GameOptionsWindow : Window {
 
 	void SetTab(WidgetID widget)
 	{
+#ifdef __EMSCRIPTEN__
+		/* No social platforms to integrate with in a browser, so no Social tab. */
+		this->SetWidgetsLoweredState(false, WID_GO_TAB_GENERAL, WID_GO_TAB_GRAPHICS, WID_GO_TAB_SOUND, WID_GO_TAB_ADVANCED);
+#else
 		this->SetWidgetsLoweredState(false, WID_GO_TAB_GENERAL, WID_GO_TAB_GRAPHICS, WID_GO_TAB_SOUND, WID_GO_TAB_ADVANCED, WID_GO_TAB_SOCIAL);
+#endif
 		this->LowerWidget(widget);
 		GameOptionsWindow::active_tab = widget;
 
@@ -1560,7 +1569,9 @@ struct GameOptionsWindow : Window {
 			this->SetWidgetDisabledState(WID_GO_BASE_MUSIC_TEXTFILE + tft, BaseMusic::GetUsedSet() == nullptr || !BaseMusic::GetUsedSet()->GetTextfile(tft).has_value());
 		}
 
+#ifndef __EMSCRIPTEN__
 		this->SetWidgetsDisabledState(!_network_available, WID_GO_BASE_GRF_CONTENT_DOWNLOAD, WID_GO_BASE_SFX_CONTENT_DOWNLOAD, WID_GO_BASE_MUSIC_CONTENT_DOWNLOAD);
+#endif
 
 		/* Update which settings are to be visible. */
 		RestrictionMode min_level = (this->filter.mode <= RM_ALL) ? this->filter.mode : RM_BASIC;
@@ -1613,7 +1624,9 @@ static constexpr std::initializer_list<NWidgetPart> _nested_game_options_widgets
 			NWidget(WWT_TEXTBTN, GAME_OPTIONS_BUTTON, WID_GO_TAB_GENERAL),  SetMinimalTextLines(2, 0), SetStringTip(STR_GAME_OPTIONS_TAB_GENERAL, STR_GAME_OPTIONS_TAB_GENERAL_TOOLTIP), SetFill(1, 0), SetResize(1, 0),
 			NWidget(WWT_TEXTBTN, GAME_OPTIONS_BUTTON, WID_GO_TAB_GRAPHICS), SetMinimalTextLines(2, 0), SetStringTip(STR_GAME_OPTIONS_TAB_GRAPHICS, STR_GAME_OPTIONS_TAB_GRAPHICS_TOOLTIP), SetFill(1, 0), SetResize(1, 0),
 			NWidget(WWT_TEXTBTN, GAME_OPTIONS_BUTTON, WID_GO_TAB_SOUND),    SetMinimalTextLines(2, 0), SetStringTip(STR_GAME_OPTIONS_TAB_SOUND, STR_GAME_OPTIONS_TAB_SOUND_TOOLTIP), SetFill(1, 0), SetResize(1, 0),
+#ifndef __EMSCRIPTEN__
 			NWidget(WWT_TEXTBTN, GAME_OPTIONS_BUTTON, WID_GO_TAB_SOCIAL),   SetMinimalTextLines(2, 0), SetStringTip(STR_GAME_OPTIONS_TAB_SOCIAL, STR_GAME_OPTIONS_TAB_SOCIAL_TOOLTIP), SetFill(1, 0), SetResize(1, 0),
+#endif
 			NWidget(WWT_TEXTBTN, GAME_OPTIONS_BUTTON, WID_GO_TAB_ADVANCED), SetMinimalTextLines(2, 0), SetStringTip(STR_GAME_OPTIONS_TAB_ADVANCED, STR_GAME_OPTIONS_TAB_ADVANCED_TOOLTIP), SetFill(1, 0), SetResize(1, 0),
 		EndContainer(),
 	EndContainer(),
@@ -1680,6 +1693,7 @@ static constexpr std::initializer_list<NWidgetPart> _nested_game_options_widgets
 						EndContainer(),
 					EndContainer(),
 
+					NWidget(NWID_SELECTION, INVALID_COLOUR, WID_GO_DISPLAY_SEL),
 					NWidget(WWT_FRAME, GAME_OPTIONS_BACKGROUND), SetStringTip(STR_GAME_OPTIONS_DISPLAY), SetTextStyle(GAME_OPTIONS_FRAME),
 						NWidget(NWID_VERTICAL), SetPIP(0, WidgetDimensions::unscaled.vsep_normal, 0),
 							NWidget(NWID_HORIZONTAL, NWidContainerFlag::EqualSize), SetPIP(0, WidgetDimensions::unscaled.hsep_normal, 0),
@@ -1709,12 +1723,15 @@ static constexpr std::initializer_list<NWidgetPart> _nested_game_options_widgets
 							EndContainer(),
 						EndContainer(),
 					EndContainer(),
+					EndContainer(),
 
 					NWidget(WWT_FRAME, GAME_OPTIONS_BACKGROUND), SetStringTip(STR_GAME_OPTIONS_BASE_GRF), SetTextStyle(GAME_OPTIONS_FRAME), SetPIP(0, WidgetDimensions::unscaled.vsep_sparse, 0), SetFill(1, 0),
 						NWidget(NWID_HORIZONTAL), SetPIP(0, WidgetDimensions::unscaled.hsep_wide, 0),
 							NWidget(WWT_DROPDOWN, GAME_OPTIONS_BUTTON, WID_GO_BASE_GRF_DROPDOWN), SetToolTip(STR_GAME_OPTIONS_BASE_GRF_TOOLTIP), SetFill(1, 0), SetResize(1, 0),
 							NWidget(WWT_PUSHTXTBTN, GAME_OPTIONS_BUTTON, WID_GO_BASE_GRF_PARAMETERS), SetStringTip(STR_NEWGRF_SETTINGS_SET_PARAMETERS),
+#ifndef __EMSCRIPTEN__
 							NWidget(WWT_PUSHTXTBTN, GAME_OPTIONS_BUTTON, WID_GO_BASE_GRF_CONTENT_DOWNLOAD), SetStringTip(STR_GAME_OPTIONS_ONLINE_CONTENT, STR_GAME_OPTIONS_ONLINE_CONTENT_TOOLTIP),
+#endif
 						EndContainer(),
 						NWidget(WWT_TEXT, INVALID_COLOUR, WID_GO_BASE_GRF_DESCRIPTION), SetStringTip(STR_EMPTY, STR_GAME_OPTIONS_BASE_GRF_DESCRIPTION_TOOLTIP), SetFill(1, 0), SetResize(1, 0),
 						NWidget(NWID_VERTICAL),
@@ -1749,7 +1766,9 @@ static constexpr std::initializer_list<NWidgetPart> _nested_game_options_widgets
 					NWidget(WWT_FRAME, GAME_OPTIONS_BACKGROUND), SetStringTip(STR_GAME_OPTIONS_BASE_SFX), SetTextStyle(GAME_OPTIONS_FRAME), SetPIP(0, WidgetDimensions::unscaled.vsep_sparse, 0),
 						NWidget(NWID_HORIZONTAL), SetPIP(0, WidgetDimensions::unscaled.hsep_wide, 0),
 							NWidget(WWT_DROPDOWN, GAME_OPTIONS_BUTTON, WID_GO_BASE_SFX_DROPDOWN), SetToolTip(STR_GAME_OPTIONS_BASE_SFX_TOOLTIP), SetFill(1, 0), SetResize(1, 0),
+#ifndef __EMSCRIPTEN__
 							NWidget(WWT_PUSHTXTBTN, GAME_OPTIONS_BUTTON, WID_GO_BASE_SFX_CONTENT_DOWNLOAD), SetStringTip(STR_GAME_OPTIONS_ONLINE_CONTENT, STR_GAME_OPTIONS_ONLINE_CONTENT_TOOLTIP),
+#endif
 						EndContainer(),
 						NWidget(WWT_EMPTY, INVALID_COLOUR, WID_GO_BASE_SFX_DESCRIPTION), SetMinimalTextLines(1, 0), SetToolTip(STR_GAME_OPTIONS_BASE_SFX_DESCRIPTION_TOOLTIP), SetFill(1, 0), SetResize(1, 0),
 						NWidget(NWID_VERTICAL),
@@ -1767,7 +1786,9 @@ static constexpr std::initializer_list<NWidgetPart> _nested_game_options_widgets
 					NWidget(WWT_FRAME, GAME_OPTIONS_BACKGROUND), SetStringTip(STR_GAME_OPTIONS_BASE_MUSIC), SetTextStyle(GAME_OPTIONS_FRAME), SetPIP(0, WidgetDimensions::unscaled.vsep_sparse, 0),
 						NWidget(NWID_HORIZONTAL), SetPIP(0, WidgetDimensions::unscaled.hsep_wide, 0),
 							NWidget(WWT_DROPDOWN, GAME_OPTIONS_BUTTON, WID_GO_BASE_MUSIC_DROPDOWN), SetToolTip(STR_GAME_OPTIONS_BASE_MUSIC_TOOLTIP), SetFill(1, 0), SetResize(1, 0),
+#ifndef __EMSCRIPTEN__
 							NWidget(WWT_PUSHTXTBTN, GAME_OPTIONS_BUTTON, WID_GO_BASE_MUSIC_CONTENT_DOWNLOAD), SetStringTip(STR_GAME_OPTIONS_ONLINE_CONTENT, STR_GAME_OPTIONS_ONLINE_CONTENT_TOOLTIP),
+#endif
 						EndContainer(),
 						NWidget(NWID_HORIZONTAL), SetPIP(0, WidgetDimensions::unscaled.hsep_wide, 0),
 							NWidget(WWT_EMPTY, INVALID_COLOUR, WID_GO_BASE_MUSIC_DESCRIPTION), SetMinimalTextLines(1, 0), SetToolTip(STR_GAME_OPTIONS_BASE_MUSIC_DESCRIPTION_TOOLTIP), SetFill(1, 0), SetResize(1, 0),
diff --git a/src/toolbar_gui.cpp b/src/toolbar_gui.cpp
index c86465e..a4c8ee2 100644
--- a/src/toolbar_gui.cpp
+++ b/src/toolbar_gui.cpp
@@ -370,8 +370,12 @@ enum SaveLoadNormalMenuEntries : uint8_t {
  */
 static CallBackFunction ToolbarSaveClick(Window *w)
 {
+#ifdef __EMSCRIPTEN__
+	PopupMainToolbarMenu(w, WID_TN_SAVE, {STR_FILE_MENU_SAVE_GAME, STR_FILE_MENU_LOAD_GAME, STR_FILE_MENU_QUIT_GAME});
+#else
 	PopupMainToolbarMenu(w, WID_TN_SAVE, {STR_FILE_MENU_SAVE_GAME, STR_FILE_MENU_LOAD_GAME, STR_FILE_MENU_QUIT_GAME,
 			STR_NULL, STR_FILE_MENU_EXIT});
+#endif
 	return CBF_NONE;
 }
 
@@ -385,7 +389,11 @@ static CallBackFunction ToolbarScenSaveOrLoad(Window *w)
 {
 	PopupMainToolbarMenu(w, WID_TE_SAVE, {STR_SCENEDIT_FILE_MENU_SAVE_SCENARIO, STR_SCENEDIT_FILE_MENU_LOAD_SCENARIO,
 			STR_SCENEDIT_FILE_MENU_SAVE_HEIGHTMAP, STR_SCENEDIT_FILE_MENU_LOAD_HEIGHTMAP,
+#ifdef __EMSCRIPTEN__
+			STR_SCENEDIT_FILE_MENU_QUIT_EDITOR});
+#else
 			STR_SCENEDIT_FILE_MENU_QUIT_EDITOR, STR_NULL, STR_SCENEDIT_FILE_MENU_QUIT});
+#endif
 	return CBF_NONE;
 }
 
diff --git a/src/video/sdl2_v.cpp b/src/video/sdl2_v.cpp
index e31afce..2686d60 100644
--- a/src/video/sdl2_v.cpp
+++ b/src/video/sdl2_v.cpp
@@ -136,8 +136,17 @@ bool VideoDriver_SDL_Base::CreateMainWindow(uint w, uint h, uint flags)
 {
 	if (this->sdl_window != nullptr) return true;
 
+#ifdef __EMSCRIPTEN__
+	/* The page sizes the canvas (wg_resize), not SDL from the browser window. */
+	flags |= SDL_WINDOW_SHOWN;
+#else
 	flags |= SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE;
+#endif
 
+#ifdef __EMSCRIPTEN__
+	/* A full screen setting saved elsewhere: the page owns full screen. */
+	_fullscreen = false;
+#endif
 	if (_fullscreen) {
 		flags |= SDL_WINDOW_FULLSCREEN;
 	}
@@ -630,8 +639,26 @@ void VideoDriver_SDL_Base::InputLoop()
 	if (old_ctrl_pressed != _ctrl_pressed) HandleCtrlChanged();
 }
 
+#ifdef __EMSCRIPTEN__
+static int _wg_width = 0;
+static int _wg_height = 0;
+
+/** The page's game area changed size: the game takes it at the top of the next frame. */
+extern "C" EMSCRIPTEN_KEEPALIVE void wg_resize(int w, int h)
+{
+	_wg_width = w;
+	_wg_height = h;
+}
+#endif
+
 void VideoDriver_SDL_Base::LoopOnce()
 {
+#ifdef __EMSCRIPTEN__
+	if (_wg_width > 0 && _wg_height > 0) {
+		this->ChangeResolution(_wg_width, _wg_height);
+		_wg_width = _wg_height = 0;
+	}
+#endif
 	if (_exit_game) {
 #ifdef __EMSCRIPTEN__
 		/* Emscripten is event-driven, and as such the main loop is inside
@@ -689,6 +716,10 @@ bool VideoDriver_SDL_Base::ChangeResolution(int w, int h)
 
 bool VideoDriver_SDL_Base::ToggleFullscreen(bool fullscreen)
 {
+#ifdef __EMSCRIPTEN__
+	/* The page owns full screen. */
+	return !fullscreen;
+#endif
 	/* Remember current window size */
 	int w, h;
 	SDL_GetWindowSize(this->sdl_window, &w, &h);
diff --git a/src/widgets/settings_widget.h b/src/widgets/settings_widget.h
index 5ea226a..53f1c6c 100644
--- a/src/widgets/settings_widget.h
+++ b/src/widgets/settings_widget.h
@@ -36,6 +36,7 @@ enum GameOptionsWidgets : WidgetID {
 	WID_GO_GUI_FONT_AA_TEXT,       ///< Text for anti-alias toggle.
 	WID_GO_BASE_GRF_DROPDOWN,      ///< Use to select a base GRF.
 	WID_GO_BASE_GRF_PARAMETERS,    ///< Base GRF parameters.
+	WID_GO_DISPLAY_SEL, ///< Selection to hide the display frame.
 	WID_GO_BASE_GRF_CONTENT_DOWNLOAD, ///< 'Get Content' button for base GRF.
 	WID_GO_BASE_GRF_OPEN_URL,      ///< Open base GRF URL.
 	WID_GO_BASE_GRF_TEXTFILE,      ///< Open base GRF readme, changelog (+1) or license (+2).