Class attributes are characteristics that belong to the class itself. Every instance of the class will share them. As a result, they are always equal in value.
Use and definition. For an element, the class property defines one or more classnames. A class in a style sheet is often referenced using the class property. However, it can also be used by JavaScript to modify HTML components that belong to a particular class (via the HTML DOM).
For an element, the HTML class attribute defines one or more class names. JavaScript and CSS both make use of classes to select and access particular items.
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