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javascript/snippets/element-contains.md

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+---
+title: Element contains another element
+type: snippet
+tags: [browser]
+cover: red-petals
+dateModified: 2020-11-03T22:11:18+02:00
+---
+
+Checks if the `parent` element contains the `child` element.
+
+- Check that `parent` is not the same element as `child`.
+- Use `Node.contains()` to check if the `parent` element contains the `child` element.
+
+```js
+const elementContains = (parent, child) =>
+  parent !== child && parent.contains(child);
+```
+
+```js
+elementContains(
+  document.querySelector('head'),
+  document.querySelector('title')
+);
+// true
+elementContains(document.querySelector('body'), document.querySelector('body'));
+// false
+```