Add elementIsFocused

snippets/elementIsFocused.md

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+---
+title: elementIsFocused
+tags: browser,intermediate
+---
+
+Returns `true` if the given element is focused, `false` otherwise.
+
+Use `document.activeElement` to determine if the given element is focused.
+
+```js
+const elementIsFocused = el => (el === document.activeElement);
+```
+
+```js
+elementIsFocused(el); // true if the element is focused
+```