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  1. 123

    The querySelector method in JavaScript is a powerful tool for selecting elements from the DOM (Document Object Model). It allows you to find the first element within the document that matches a specified CSS selector or a group of CSS selectors.

    Basic Usage

    The querySelector method is used to select the first element that matches a given CSS selector. If no matches are found, it returns null. Here is the basic syntax:

    document.querySelector(selectors);
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    Parameters

    • selectors: A string containing one or more CSS selectors to match. This string must be a valid CSS selector string; otherwise, a SyntaxError exception is thrown.

    Return Value

    • An Element object representing the first element in the document that matches the specified set of CSS selectors, or null if there are no matches.

    Examples

    Selecting by Tag Name

    To select the first <p> element in the document:

    const firstParagraph = document.querySelector("p");
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    Selecting by Class Name

    To select the first element with the class example:

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  2. W3School
    https://www.w3schools.com › jsref › met_document_queryselector.asp

    HTML DOM Document querySelector () Method - W3Schools

    Learn how to use the querySelector() method to select the first element that matches a CSS selector. See examples, syntax, parameters, return value, and browser support for this DOM method.

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  3. Mozilla Developer
    https://developer.mozilla.org › en-US › docs › Web › API › Document › querySe…

    Document: querySelector () method - Web APIs | MDN

    • The Document method querySelector() returns the first Element within the document that matches the specified selector, or group of selectors. If no matches are found, null is returned.
    See more on developer.mozilla.org
  4. JavaScript Tutorial
    https://www.javascripttutorial.net › javascript-dom › javascript-queryselec…

    JavaScript querySelector: Selecting Elements By CSS Selectors

    Learn how to use the querySelector() and querySelectorAll() methods to select elements by CSS selectors in JavaScript. See examples of basic and advanced selectors, combinators, and NodeList …

  5. FreeCodecamp
    https://www.freecodecamp.org › news › queryselector-method-javascript

    What is the querySelector () Method and How Does it Work in …

    Feb 12, 2024 · Learn how to use the querySelector method to select the first element that matches a CSS selector in JavaScript. See examples of type selectors, class selectors, and querySelectorAll …

  6. Codecademy
    https://www.codecademy.com › ... › javascript › dom-mani…

    JavaScript | DOM Manipulation | querySelector ()

    Mar 21, 2025 · It efficiently searches the DOM (Document Object Model) and provides a modern approach to selecting elements in JavaScript. Unlike older …

  7. DEV Community
    https://dev.to › ...

    Mastering querySelector and querySelectorAll in …

    Dec 17, 2024 · The querySelector and querySelectorAll methods are powerful tools in JavaScript for selecting elements in the DOM. They allow developers to use …

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  9. ZetCode
    https://zetcode.com › dom › element-queryselector

    JavaScript querySelector Guide: Learn How to Access DOM ... - ZetCode

    Apr 2, 2025 · Learn how to use JavaScript's querySelector method effectively with examples and detailed explanations. Enhance your web development skills with this step-by-step tutorial.

  10. Sling Academy
    https://www.slingacademy.com › article › mastering-queryselector-tips-an…

    Mastering querySelector (): Tips and Best Practices in JavaScript ...

    Dec 12, 2024 · Learn tips and best practices for using querySelector(), a method for selecting elements in the DOM by CSS selectors. Avoid common pitfalls, handle elements that may not exist, and …

  11. LaunchCode Education
    https://education.launchcode.org › ... › queryselector-examples.html

    querySelector and querySelectorAll Examples — Introduction to ...

    Uses a CSS selector pattern and CSS selector rules to find a matching elements. Returns ALL elements that match the selector. If NO match is found, null is returned.

  12. W3School
    https://www.w3schools.com › jsref › met_document_queryselectorall.asp

    HTML DOM Document querySelectorAll () Method - W3Schools

    document.querySelectorAll() is a DOM Level 3 (2004) feature. It is fully supported in all modern browsers: Well organized and easy to understand Web building tutorials with lots of examples of how …

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