This course has been updated! We now recommend you take the CSS In-Depth, v2 course.
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The "UI pseudo-classes" Lesson is part of the full, CSS3 In-Depth course featured in this preview video. Here's what you'd learn in this lesson:
UI pseudo classes are based on the current state or structure of the UI. For example, a style may be applied if an item is enabled, disabled or checked. HTML5 web forms also introduce a number of additional pseudo-classes that accompany the new input types. Demonstration of UI selectors and pseudo-classes