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## HTML DOM nextElementSibling Property The `nextElementSibling` property returns the element immediately following the specified element in the same tree level. This property is read-only and is highly useful for traversing the Document Object Model (DOM) without accidentally selecting whitespace or comment nodes. --- ## Quick Example The following code retrieves the HTML content of the next sibling element of the element with `id="item1"`: ```javascript // Get the HTML content of the next sibling element var nextContent = document.getElementById("item1").nextElementSibling.innerHTML; ``` --- ## Definition and Usage The `nextElementSibling` property returns the next sibling **element node** of the specified element. If there is no next sibling element, it returns `null`. ### Difference between `nextSibling` and `nextElementSibling` It is important to understand how `nextElementSibling` differs from `nextSibling`: * **`nextSibling`**: Returns the next sibling **node**, which can be an element node, a text node (including whitespace, line breaks, and tabs), or a comment node. * **`nextElementSibling`**: Returns only the next sibling **element node** (ignoring text and comment nodes). ### Related Properties * To get the *previous* sibling element, use the (prop-element-previouselementsibling.html) property. * To get all child elements of a specified element, use the (prop-element-children.html) property. --- ## Syntax ```javascript let nextSiblingElement = node.nextElementSibling; ``` --- ## Technical Details | Feature | Description | | :--- | :--- | | **Return Value** | A **Node** object representing the next sibling element of the specified node. Returns `null` if no such element exists. | | **Read/Write** | Read-only | | **DOM Version** | DOM Level 3 | --- ## Browser Support The `nextElementSibling` property is fully supported by all modern browsers: | Property | Chrome | Edge / IE | Firefox | Safari | Opera | | :--- | :--- | :--- | :--- | :--- | :--- | | **`nextElementSibling`** | 2.0+ | 9.0+ | 3.5+ | 4.0+ | 10.0+ | --- ## Interactive Code Examples ### Example 1: Basic Traversal In this example, we will select an active list item and style its immediate next sibling. #### HTML: ```html

• Item 1 (Active)
• Item 2
• Item 3

Highlight Next Element ``` #### JavaScript: ```javascript function highlightNext() { const currentItem = document.getElementById("item1"); const nextItem = currentItem.nextElementSibling; if (nextItem !== null) { nextItem.style.backgroundColor = "yellow"; nextItem.style.fontWeight = "bold"; } else { console.log("No next sibling element found."); } } ``` ### Example 2: Comparing `nextSibling` vs `nextElementSibling` This example demonstrates how `nextSibling` might return an empty text node (due to line breaks in HTML), while `nextElementSibling` safely targets the actual HTML element. ```html ```