Make canvas resize optional in HTML5.

misc/dist/html/full-size.html

@@ -146,6 +146,7 @@ $GODOT_HEAD_INCLUDE
 			const EXECUTABLE_NAME = '$GODOT_BASENAME';
 			const MAIN_PACK = '$GODOT_BASENAME.pck';
 			const INDETERMINATE_STATUS_STEP_MS = 100;
+			const FULL_WINDOW = $GODOT_FULL_WINDOW;
 
 			var canvas = document.getElementById('canvas');
 			var statusProgress = document.getElementById('status-progress');
@@ -178,8 +179,12 @@ $GODOT_HEAD_INCLUDE
 					canvas.style.height = lastHeight + "px";
 				}
 			}
-			animationCallbacks.push(adjustCanvasDimensions);
-			adjustCanvasDimensions();
+			if (FULL_WINDOW) {
+				animationCallbacks.push(adjustCanvasDimensions);
+				adjustCanvasDimensions();
+			} else {
+				engine.setCanvasResizedOnStart(true);
+			}
 
 			setStatusMode = function setStatusMode(mode) {
 

platform/javascript/export/export.cpp

@@ -254,6 +254,7 @@ void EditorExportPlatformJavaScript::_fix_html(Vector<uint8_t> &p_html, const Re
 		current_line = current_line.replace("$GODOT_BASENAME", p_name);
 		current_line = current_line.replace("$GODOT_PROJECT_NAME", ProjectSettings::get_singleton()->get_setting("application/config/name"));
 		current_line = current_line.replace("$GODOT_HEAD_INCLUDE", p_preset->get("html/head_include"));
+		current_line = current_line.replace("$GODOT_FULL_WINDOW", p_preset->get("html/full_window_size") ? "true" : "false");
 		current_line = current_line.replace("$GODOT_DEBUG_ENABLED", p_debug ? "true" : "false");
 		str_export += current_line + "\n";
 	}
@@ -290,6 +291,7 @@ void EditorExportPlatformJavaScript::get_export_options(List<ExportOption> *r_op
 	r_options->push_back(ExportOption(PropertyInfo(Variant::BOOL, "vram_texture_compression/for_mobile"), false)); // ETC or ETC2, depending on renderer
 	r_options->push_back(ExportOption(PropertyInfo(Variant::STRING, "html/custom_html_shell", PROPERTY_HINT_FILE, "*.html"), ""));
 	r_options->push_back(ExportOption(PropertyInfo(Variant::STRING, "html/head_include", PROPERTY_HINT_MULTILINE_TEXT), ""));
+	r_options->push_back(ExportOption(PropertyInfo(Variant::BOOL, "html/full_window_size"), true));
 	r_options->push_back(ExportOption(PropertyInfo(Variant::STRING, "custom_template/release", PROPERTY_HINT_GLOBAL_FILE, "*.zip"), ""));
 	r_options->push_back(ExportOption(PropertyInfo(Variant::STRING, "custom_template/debug", PROPERTY_HINT_GLOBAL_FILE, "*.zip"), ""));
 }