diff --git a/ball/main.c b/ball/main.c
index 2be4199e..bdbcb4ec 100644
--- a/ball/main.c
+++ b/ball/main.c
@@ -269,9 +269,11 @@ static int handle_key_dn(SDL_Event *e)
     case SDLK_KP_ENTER:
         d = st_buttn(config_get_d(CONFIG_JOYSTICK_BUTTON_A), 1);
         break;
+#ifndef __EMSCRIPTEN__
     case KEY_FULLSCREEN:
         video_fullscreen(!config_get_d(CONFIG_FULLSCREEN));
         break;
+#endif
 
     default:
         if (config_tst_d(CONFIG_KEY_FORWARD,  c))
diff --git a/share/st_common.c b/share/st_common.c
index 95091c22..4e267dc1 100644
--- a/share/st_common.c
+++ b/share/st_common.c
@@ -366,8 +366,10 @@ static int video_gui(void)
             gui_set_label(jd, display);
         }
 
+#ifndef __EMSCRIPTEN__
         conf_toggle(id, _("Fullscreen"),   VIDEO_FULLSCREEN,
                     config_get_d(CONFIG_FULLSCREEN), _("On"), 1, _("Off"), 0);
+#endif
 
         if ((jd = conf_state (id, _("Resolution"), resolution,
                               VIDEO_RESOLUTION)))
diff --git a/share/video.c b/share/video.c
index 6218f99d..30163e65 100644
--- a/share/video.c
+++ b/share/video.c
@@ -229,6 +229,11 @@ int video_mode(int f, int w, int h)
     int hmd     = config_get_d(CONFIG_HMD)         ? 1 : 0;
     int highdpi = config_get_d(CONFIG_HIGHDPI)     ? 1 : 0;
 
+#ifdef __EMSCRIPTEN__
+    /* The page has its own full screen; SDL's takes the page over. */
+    f = 0;
+#endif
+
     int dpy = config_get_d(CONFIG_DISPLAY);
 
     int X = SDL_WINDOWPOS_CENTERED_DISPLAY(dpy);