The z-index
property is a CSS property that controls the stacking order of positioned elements along the z-axis (the axis perpendicular to both the x and y axes) in a web page.
In simpler terms, it determines the visual depth or layering of elements on the screen. The element with a higher z-index
value appears in front of elements with lower values. Here’s the purpose of the z-index
property in points:
-
Layering Control: It determines the stacking order of positioned elements along the z-axis. Elements with higher
z-index
values appear in front of elements with lower values. - Overlapping Elements: Useful for managing the visibility of overlapping UI components, such as dropdowns, modal dialogues, or tooltips.
- Contextual Stacking: Allows control of stacking order within a specific context when using CSS positioning.
- CSS Animations: Influences stacking order during CSS animations or transitions, ensuring elements appear on top when animated.
- Depth in 3D Space: Provides a sense of depth in 3D space on a 2D screen, allowing developers to control the visual hierarchy of elements.
- User Interface Design: Essential for designing visually dynamic and interactive user interfaces with layered or stacked elements.
Syntax:
selector {
z-index: value;
}
Components
-
selector: The HTML element or class/id selector to which you want to apply the
z-index
property. -
value: An integer representing the stacking order. Elements with a higher
z-index
value will appear in front of elements with lower values.
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