What actually transfers
Auto-layout becomes flexbox almost one to one. A frame with direction, gap, padding and alignment is a div with the same four properties, and a file built on auto-layout throughout is the single biggest speed-up available to a Webflow build.
Text styles become classes. If the file has eight text styles, the site has eight classes and the typography stays consistent for years. If the file has forty ad-hoc text settings, the build either invents a system on your behalf or ships forty one-off styles that nobody can maintain.
Variables become variables. Colour and spacing tokens carry across, which is what makes a later rebrand a half-day rather than a re-audit of every page.
Components become components, with one caveat: Webflow's model is not Figma's. Variants that differ only in colour or text map cleanly; variants that restructure the layout usually become separate components on the build side.
What gets rebuilt by hand
Absolute positioning nested several levels deep. It holds in a fixed-width frame and falls apart at every other width, so it gets re-expressed as flow and grid, which is a design decision, not a translation, and someone has to make it.
Blend modes, masks and group-level blur. Some have CSS equivalents, some have expensive ones, and some have none. Each is a small conversation, and having it in week one is much cheaper than in week three.
Anything drawn as one flattened image. It can stay an image (fast to build, invisible to search, blurry on a big screen) or become real elements. Both are valid; only one is what the designer assumed.
Prototype interactions. A Figma prototype is a mood, not a specification. Hover states, empty states and loading states need to exist as drawn frames or they will be invented during the build.
The handoff that saves a week
Named layers, one stated grid, states drawn, fonts licensed for web, and content that is real or at least real-length. Five things, none of them glamorous.
Fonts are the one that stops launches. A typeface licensed for a desktop mockup is not necessarily licensed for a website, and finding that out in week three is a relaunch, not a fix.
HikeMind is the shape this pays off on: a dark hero with a data-drawn mountain range behind the type and a strip of cards that reveals on hover. That either gets rebuilt properly or gets flattened into a picture and quietly loses its interaction. We rebuilt it.