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In JavaScript, 'className' is a property used to get or set the value of the class attribute of an element, while 'classList' is a read-only property returning a live DOMTokenList collection of the class attributes of the element. React uses 'className' instead of 'class' because 'class' is a JavaScript reserved keyword. Selenium WebDriver provides a 'className()' command to find elements by their class name. Understanding the difference between 'classList' and 'className' is fundamental in JavaScript and web development.

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