1. Use a grid system
Web development is governed by rules, usually the CSS Box Model. When a design does not follow a consistent spacing system, the developer has to interpret every distance independently, which multiplies the risk of micro-inconsistencies.
An 8pt grid, a clear column system and documented spacing rules eliminate ambiguity and speed up both implementation and QA.
- Stick to a consistent spacing system, such as an 8pt grid.
- Define container widths clearly, for example 1280px or 1440px.
- Avoid mixing arbitrary pixel values: 20px next to 22px creates uncertainty.
2. Assets: exportable vs CSS
Help me keep the site fast. Handoff is not only about visual shapes; it is also about the weight of the final page. Every choice around assets affects performance, SEO and long-term maintainability.
SVGs for icons and logos, optimized photos and CSS gradients instead of heavy raster images. These details determine whether the agency's client loves the site or feels frustrated by it.
- Icons and logos should be SVGs, not PNGs.
- Prepare photos with standard aspect ratios such as 16:9 or 4:3.
- Shadows and gradients should remain editable styles when possible instead of flattened images.
- Trim duplicate assets and always supply the native size required by the layout.
3. Responsive states
Sending only a desktop view is like sending half a blueprint. Often 60-70% of traffic comes from mobile, and without clear guidance the developer has to guess on column stacking, menu behavior, padding and font sizes.
A full set of device-specific mockups is not necessary, but desktop, mobile and any truly different tablet behavior should be defined. Specifying how sections collapse avoids two or three unnecessary revision rounds.
- Desktop 1440px as the main view.
- Mobile 375px or 390px for menu behavior and stacking.
- Tablet only when the layout changes materially.
- If a section has four columns on desktop and two on mobile, make that explicit.
4. Hover and interaction states
Define what happens to buttons and inputs when state changes occur. Hover, focus, active, disabled: every undefined state gets implemented based on developer interpretation, which rarely matches the original intent.
A UI kit page in Figma with buttons, form inputs and typography works as a reliable source of truth. A well-built kit eliminates dozens of questions and ensures visual consistency across every page.
- Include hover, focus and active states for all interactive components.
- Define the style of inline text links, not only buttons.
- Provide a disabled state for form fields and submit buttons.
Next step
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