A specific screen width where your design adapts to a different layout, ensuring your site looks good on all devices from phones to large monitors. Strategic breakpoint choices prevent awkward in-between states where content becomes cramped or overly stretched. Framer's breakpoint system lets you customize layouts at each size while maintaining a single source of truth for your design.

Rules that define how an element should resize or reposition when its parent container changes size. Constraints control whether elements stretch, stay fixed, or maintain proportional relationships during responsive resizing. Setting constraints correctly in Framer ensures your layouts adapt elegantly across different screen sizes.

A parent element that holds and organizes child elements, defining boundaries for layout and positioning. Containers with maximum widths prevent content from becoming too wide on large screens while allowing full-width backgrounds. Framer's containers support auto layout, padding, and responsive size controls for flexible layouts.

A variable font containing multiple weights, widths, or styles in a single file, enabling smooth interpolation between values. Variable fonts reduce file downloads while offering greater typographic flexibility. Use variable fonts for performance benefits and fluid typography that responds to user preferences.

CSS rules that apply different styles based on device characteristics like screen width, orientation, or resolution. Media queries enable responsive design by adapting layouts at defined breakpoints. Framer handles media queries automatically based on your breakpoint configurations.

A design approach that starts with the mobile experience and progressively enhances for larger screens. Mobile-first forces prioritization and ensures the smallest screens get the best experience, not a squeezed afterthought. This approach often results in cleaner, more focused designs at all screen sizes.

A distinct content area of a page, typically spanning full width and containing related information. Sections organize long pages into digestible chunks with clear visual separation. Design sections with consistent spacing, backgrounds, and layouts that create rhythm as users scroll.

The border or outline applied to shapes and text, defined by weight, color, and style like solid, dashed, or dotted. Strokes add definition, create contrast, or achieve specific visual styles like outlined buttons. Framer offers stroke controls including width, color, and position (inside, center, outside).

A CSS unit equal to 1% of the browser viewport width, enabling fluid sizing relative to screen width. Vw units are useful for responsive typography and full-width elements. Combine with max-width constraints for practical maximum sizes. See Relative, fixed, and viewport Sizing in Framer.

Temporary storage that keeps copies of assets so repeat visits load faster and consume less bandwidth. Effective caching can significantly improve page-load performance for returning users. CDNs and browser cache policies work together to deliver assets efficiently.

The proportional relationship between an element's width and height, expressed as a ratio like 16:9 or 4:3. Maintaining consistent aspect ratios prevents layout shifts when images load and ensures visual harmony across different screen sizes. Framer preserves aspect ratios automatically when you resize images proportionally by holding Shift while dragging. See Using images with unique aspect ratios in the CMS.

The maximum rate of data transfer across a network connection, measured in bits per second. Higher bandwidth allows faster loading of large assets like images and videos, directly impacting user experience. Optimize bandwidth usage by compressing images, lazy loading off-screen content, and leveraging Framer's automatic performance optimizations.

The number of pixels displayed on screen, typically expressed as width by height, affecting image sharpness and detail. Higher resolution requires appropriately sized assets to appear crisp. Design with resolution independence in mind using vector graphics where possible.

Breakpoint Overrides are responsive design adjustments applied at specific viewport widths so elements can adapt without changing the base design.