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CSS Specificity is the process of determining the most relevant set of CSS property values or styles browsers will apply to an element. CSS Selectors are that part of CSS rule that finds or selects the HTML elements you want to style. Inline styles are the styles defined directly within an HTML element’s tag. Pseudo-classes are used to define a special state of an element when a user mouses over it when the elements get focus. The most common CSS selectors are summarized below, Universal Selectors and ID Selectors.