Change the text of the first child element with class="example" in a <div> element:
More "Try it Yourself" examples below.
The querySelector() method returns the first child element that matches a specified CSS selector(s) of an element.
Note: The querySelector() method only returns the first element that matches the specified selectors. To return all the matches, use the querySelectorAll() method instead.
For more information about CSS Selectors, visit our CSS Selectors Tutorial and our CSS Selectors Reference.
The numbers in the table specifies the first browser version that fully supports the method.
Method | |||||
---|---|---|---|---|---|
querySelector() | 4.0 | 8.0 | 3.5 | 3.2 | 10.0 |
Parameter | Type | Description |
---|---|---|
CSS selectors | String | Required. Specifies one or more CSS selectors to match the element. These are used to select HTML
elements based on their id, classes, types, attributes, values of attributes,
etc. For multiple selectors, separate each selector with a comma. The returned element depends on which element that is first found in the document (See "More Examples"). Tip: For a list of all CSS Selectors, look at our CSS Selectors Reference. |
DOM Version: | Selectors Level 1 Element Object |
---|---|
Return Value: | The first element that matches the specified CSS selector(s). If no matches are found, null is returned. Throws a SYNTAX_ERR exception if the specified selector(s) is invalid. |
Change the text of the first <p> element in a <div> element:
Change the text of the first <p> element with class="example" in a <div> element:
Change the text of an element with id="demo" in a <div> element:
Add a red border to the first <a> element that has a target attribute inside a <div> element:
This example demonstrates how multiple selectors work.
Assume that you have two elements: a <h2> and a <h3> element.
The following code will add a background color to the first <h2> element in <div>:
However, if the <h3> element was placed before the <h2> element in <div>. The <h3> element is the one that will get the red background color.
CSS Tutorial: CSS Selectors
CSS Reference: CSS Selectors Reference
JavaScript Tutorial: JavaScript HTML DOM Node List
JavaScript Reference: document.querySelector()
JavaScript Reference: element.querySelectorAll()
HTML DOM Reference: document.querySelectorAll()