Fixed a bug in the app2html command

Author: kitao

CHANGELOG.md

@@ -1,5 +1,10 @@
 # Change Log
 
+## 2.3.13
+
+- Modifed the inclusion order of SDL.h
+- Fixed a bug in the app2html command
+
 ## 2.3.12
 
 - Added a Q&A about file loading to the FAQ

wasm/pyxel.js

@@ -103,6 +103,9 @@ async function _createScreenElements() {
   if (!pyxelScreen) {
     pyxelScreen = document.createElement("div");
     pyxelScreen.id = "pyxel-screen";
+    if (!document.body) {
+      document.body = document.createElement("body");
+    }
     document.body.appendChild(pyxelScreen);
   }
   pyxelScreen.oncontextmenu = (event) => event.preventDefault();