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What “write it once” means in Fitz
Fitz’s .fitzv files are single-file UI components. The reported setup has two ways to execute them: an SSR backend that produces an HTML string, and a client-WASM backend built with fitz build --target wasm-client. The latter compiles Rust to WebAssembly and creates browser DOM using web-sys.
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The shared input is the component source, including its template, state, and event definitions. The outputs differ by runtime: HTML from the server versus browser DOM from the WASM target. That shared source can reduce the need to maintain separate component implementations, but it does not by itself establish identical behavior in every environment or eliminate target-specific implementation work.
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Palopoli describes a companion library of about 40 importable components, originally rendered on the server and styled with scoped CSS. Making those components compile for the browser exposed several gaps in the WASM backend.
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Raw HTML and SVG
Some components need markup such as SVG to be interpreted as markup, not displayed as escaped text. The author says the browser implementation of raw_html(x) uses set_inner_html for that purpose. The Html type also needed a small generated struct shim so existing helpers could work with it. In the SSR emitter, the marker is stripped because the existing interpolation already inserts raw markup.
Using an API that inserts raw HTML is a security-sensitive boundary: the report explains how the rendering path was enabled, but it does not provide an independent security review of input handling. Do not read compilation success as evidence that arbitrary HTML is safe to insert.
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Typed list props and defaults
Components such as Select, RadioGroup, and BarChart need structured data, not just scalar values. The WASM support was extended to clone non-nullable state fields such as Vec<FieldOption> and to lower nominal struct literals used in defaults. Palopoli reports that these changes let those components render with data in the browser.
Building lists inside helpers
A pager helper needed to create a local list by iterating over a range and adding entries with .push. The report says range iteration and list pushing were added to helper bodies. This is a distinct requirement from accepting a typed list as a component prop: helper code also needs enough list operations to assemble values during rendering.
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Events that normally fall through to a parent
Pager and ConfirmDialog use events that, in the server-side LiveViews pattern described by the author, bubble to a parent. A standalone browser mount has no such parent unless a composing component supplies one. The implementation routes a bound callback slot when the parent binds the event, and uses an inert no-op when the event is unbound.
This makes the components usable in the reported standalone browser context while preserving a route for a parent to handle events. The report does not establish that every integration pattern or event behavior has been independently tested.
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What the reported counts show—and what they do not
In 2026, Martin Palopoli reported that 38 of 38 companion components compiled to WASM and that 22 components ran in the live gallery. These are the author’s project totals, not independent audit results. Compilation across the library and execution of a subset in a gallery are different milestones.
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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minutePalopoli described the gallery as running “22 companion components compiled to WebAssembly, in the browser, from their exact server source,” including badges, cards, alerts, inputs, a button with an SVG icon, a select and radio group with live options, a bar chart, and the controlled Pager and ConfirmDialog. The examples demonstrate the range of components represented in that gallery; they do not establish measured speed, bundle size, accessibility, or production readiness.
What remains outside the report
The account is useful as an implementation description, but it is not a comparative evaluation. It supplies no controlled performance comparison, bundle-size measurements, independent security review of raw HTML insertion, or accessibility results. Nor does it quantify developer productivity or show that shared source removes all differences between server and browser behavior.
Fine-grained reactivity is described as a next step. Palopoli says it is needed so live text inputs can retain their caret during patch-in-place updates; the report gives no delivery date. That distinction matters when assessing the current scope: the stated component compilation and gallery results should not be mistaken for a claim that every interactive detail is complete.
Source
Martin Palopoli, “Write it for the server, run it in the browser: dual-target UI components in Fitz,” DEV Community. The page displays “Posted on Sep 24” without a year; the article is associated with 2026 in the available publication listing.
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