Responsive layouts need placeholder images at every breakpoint to expose cropping issues, layout shifts, and aspect-ratio mismatches before real photography is available. The Responsive Web preset generates placeholder images at mobile, tablet, desktop, and ultrawide viewports so you can build and verify responsive components against real pixel dimensions.
| Name | Dimensions | Description |
|---|---|---|
| mobile | 375x812 | Mobile — 375×812 (iPhone 13/14 viewport), the most common mobile test size |
| tablet | 768x1024 | Tablet — 768×1024 (iPad portrait), the standard tablet breakpoint |
| desktop | 1440x900 | Desktop — 1440×900, the typical laptop/desktop design canvas |
| ultrawide | 2560x1080 | Ultrawide — 2560×1080 (21:9 ratio), for wide-monitor testing |
Using a single large image and relying on CSS to scale it hides breakpoint-specific problems during development. A hero image that looks correct at 1440px desktop may crop awkwardly on a 375px mobile screen if the subject is off-center. Generating placeholder images at each breakpoint lets you test the `<picture>` element with `srcset`, verify `object-fit` and `object-position` behavior, and confirm that the image container does not cause layout shift (CLS) at any viewport. It also gives QA engineers stable fixture images for visual regression tests at multiple viewport sizes.
Use breakpoint-matched placeholder images to build and test responsive image components — hero sections, card grids, and banners — at each viewport before sourcing photography.
Generate placeholder images at each breakpoint dimension and use them as `srcset` sources to verify that the browser selects the correct image at each viewport without layout shift.
Commit placeholder images as Playwright or Cypress fixtures and run visual regression tests at mobile, tablet, and desktop viewports to catch layout changes early.
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