Aspect Ratio (CSS)
CSS aspect-ratio Property
A property that sets a preferred width-to-height ratio for an element, preventing layout shift during loading.
Technical Detail
Aspect Ratio (CSS)s test viewport and device characteristics to conditionally apply styles. Level 4 features include range syntax (width >= 768px), prefers-color-scheme (dark mode), prefers-reduced-motion (accessibility), and hover capability detection. The mobile-first approach writes base styles for small screens and uses min-width queries for larger breakpoints. Container queries (@container) complement media queries by responding to parent element size rather than viewport size.
Example
```css
/* Mobile-first: base styles for small screens */
.container { padding: 1rem; }
@media (min-width: 768px) {
.container { padding: 2rem; max-width: 720px; }
}
@media (min-width: 1024px) {
.container { max-width: 960px; }
}
```
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Related Terms
Anchor Positioning
Aspect Ratio
BEM
Box Model
Calc
Cascade
Clamp
Color Function
Color Mix
Container Query
Content Visibility
Contrast Ratio
CSS max()
CSS min()
CSS Nesting Selector
CSS Paint API
CSS Scope
Custom Properties Inheritance
Custom Property
Flexbox
Golden Ratio
Grid
:has() Selector
Keyframe Animation
lab()
Layer
Logical Property
Media Query
Nesting
oklch()
Popover
Pseudo-class
Pseudo-element
Relative Color Syntax
Scroll-Driven Animation
Scroll Snap
Selector Combinator
Specificity
Stacking Context
Starting Style
Subgrid
Text Wrap Balance
Transition
Viewport Unit
View Transition
Z-Index