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+---
+title: fullscreen
+tags: browser,intermediate
+---
+
+Opens or closes an element in fullscreen mode.
+
+- Use `document.querySelector()` and `Element.prototype.requestFullscreen()` to open the given element in fullscreen.
+- Use `document.exitFullscreen()` to exit fullscreen mode.
+- Omit the second argument, `el`, to use `body` as the default element.
+- Omit the first element, `mode`, to open the element in fullscreen mode by default.
+
+```js
+const fullscreen = (mode = true, el = 'body') =>
+  mode
+    ? document.querySelector(el).requestFullscreen()
+    : document.exitFullscreen();
+```
+
+```js
+fullscreen(); // Opens `body` in fullscreen mode
+fullscreen(false); // Exits fullscreen mode
+```