feat: Support fullscreen.

Author: silwalanish

examples/showcase/src/app.css

@@ -1,12 +1,19 @@
 * {
     margin: 0px;
     padding: 0px;
+
+    -webkit-touch-callout: none;
+    -webkit-user-select: none;
+    -moz-user-select: none;
+    -ms-user-select: none;
+    user-select: none;
 }
 
 #app {
     width: 100vw;
     height: 100vh;
     display: block;
+    background-color: #000000;
 }
 
 #app > div {

examples/showcase/src/main.ts

@@ -22,4 +22,18 @@ window.addEventListener("DOMContentLoaded", () => {
   });
 
   (window as any).app = app;
+
+  document.addEventListener("contextmenu", (event) => event.preventDefault());
+
+  element.addEventListener("dblclick", function () {
+    if (element.requestFullscreen) {
+      element.requestFullscreen();
+    } else if ((element as any).mozRequestFullScreen) {
+      (element as any).mozRequestFullScreen();
+    } else if ((element as any).webkitRequestFullscreen) {
+      (element as any).webkitRequestFullscreen();
+    } else if ((element as any).msRequestFullscreen) {
+      (element as any).msRequestFullscreen();
+    }
+  });
 });