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Qt Style Sheet terminology and syntactic rules are almost identical to those of HTML CSS. If you already know CSS, you can probably skim quickly through this section. All the examples so far used the simplest type of selector, the Type Selector. Qt Style Sheets support all the selectors defined in ... The concept of CSS (Cascading Style Sheets) is that it allows us to separate page style from page content. CSS colors are defined by the combination of Red, Green, and Blue color values. Most HTML elements have two color properties, such as, a foreground color property and a background color property.