Update reserve.md

Author: Sriparno08

content/cpp/concepts/unordered-set/terms/reserve/reserve.md

@@ -1,6 +1,6 @@
 ---
 Title: 'reserve()'
-Description: 'Requests capacity change for `std::unordered_set` so it can accommodate at least n elements without exceeding the maximum load factor.'
+Description: 'Requests capacity change for an unordered set so it can accommodate at least n elements without exceeding the maximum load factor.'
 Subjects:
   - 'Code Foundations'
   - 'Computer Science'
@@ -13,7 +13,7 @@ CatalogContent:
   - 'paths/computer-science'
 ---
 
-The **`reserve()`** method requests a capacity change for an [`std::unordered_set`](https://www.codecademy.com/resources/docs/cpp/unordered-set). It sets the number of buckets to the amount needed to accommodate at least `n` elements without exceeding the container’s `max_load_factor()`. Calling `reserve(n)` may trigger a rehash; if it does, all iterators are invalidated, but references and pointers to elements remain valid. This operation does not sort or otherwise order elements.
+The **`reserve()`** method requests a capacity change for an `std::unordered_set`. It sets the number of buckets to the amount needed to accommodate at least `n` elements without exceeding the container’s `max_load_factor()`. Calling `reserve(n)` may trigger a rehash; if it does, all iterators are invalidated, but references and pointers to elements remain valid. This operation does not sort elements or impose any ordering.
 
 ## Syntax
 

content/javascript/concepts/dom-manipulation/terms/querySelectorAll/querySelectorAll.md

@@ -0,0 +1,56 @@
+---
+Title: '.querySelectorAll()'
+Description: 'Returns a static (non-live) NodeList of all elements in the document that match the given CSS selectors.'
+Subjects:
+  - 'Code Foundations'
+  - 'Web Development'
+Tags:
+  - 'Methods'
+  - 'Node'
+  - 'Selectors'
+CatalogContent:
+  - 'introduction-to-javascript'
+  - 'paths/front-end-engineer-career-path'
+---
+
+In JavaScript, the **`.querySelectorAll()`** method under the `document` object returns a static (not live) `NodeList` of all elements that match the given group of [selectors](https://www.codecademy.com/resources/docs/css/selectors).
+
+## Syntax
+
+```pseudo
+document.querySelectorAll(selectors);
+```
+
+- `selectors`: Represents a string containing one or more CSS selectors used to match elements in the document. It follows the same rules as CSS selectors and can include:
+  - Type selectors (`div`, `p`, `span`)
+  - Class selectors (`.class-name`)
+  - ID selectors (`#id-name`)
+  - Attribute selectors (`[type="text"]`, `[disabled]`)
+  - Combinations (`div p`, `.container > p`, `ul > li:first-child`)
+
+## Examples
+
+### Example 1
+
+In this example, a `NodeList` of all `<p>` elements in the document is obtained:
+
+```js
+const matches = document.querySelectorAll('p');
+```
+
+### Example 2
+
+The following example returns a list of all `<div>` elements in the document with a class of either `note` or `alert`:
+
+```js
+const matches = document.querySelectorAll('div.note, div.alert');
+```
+
+### Example 3
+
+In this example, a list of `<p>` elements is obtained, whose immediate parent is a `<div>` with the class `highlighted`, and which are inside a container with the ID `test`:
+
+```js
+const container = document.querySelector('#test');
+const matches = container.querySelectorAll('div.highlighted > p');
+```