Showcase

The widths

Not a rounded-off guess at popular phones. Each width sits on one side of a breakpoint this stylesheet actually contains, so the set exercises every branch in it and nothing else.

Each frame says which width it is and why. A frame with no label is a screenshot; a labelled one is a claim you can check.

Compare

Compare puts all four side by side in a row that scrolls.

One width at a time answers "does it work here", which is usually the question you already know the answer to. All of them at once answers "where does it stop working", which is the one worth a screenful. The frames align to the top, so a short component does not stretch its frame to match the tallest one and hide the fact that it was short.

.showcase-stage {
	display: flex;
	align-items: start;
	justify-content: center;
}

/* Compare is a row that scrolls. One width at a time centres instead. */
.showcase-stage[data-view="compare"] {
	justify-content: start;
	overflow-x: auto;
}

There is no transition on the device toggle. It gets pressed a dozen times while reading one page, and on a control used that often an animation reads as lag rather than as polish - the state change is the feedback.

StackBlitz

The StackBlitz tab opens a live, editable copy of the demo in a real WebContainer. The reader can change the code and see the result without leaving the page.

The project is built from the same source the Code tab shows - the demo's source string becomes src/Demo.tsx in a React + TypeScript project that imports @sushindustries/ui@sushindustries/uiThe components this site is made of. Every one of them is installable on its own - nothing here is site-specific.package and @sushindustries/atoms@sushindustries/atomsThe design tokens and the atomic utilities built on them. One stylesheet, no build step, no framework.package. So the editable copy is the same code the reader was just looking at, not a reconstruction of it.

The StackBlitz SDK is wired in the app layer, not in the Showcase component itself, for the same reason the code highlighter is: packages/ui has no business depending on the StackBlitz SDK. The Showcase component takes a renderStackblitz render prop and decides where it goes; the host builds the project and hands it to the SDK.

<Showcase
	src={`/preview/${id}?fit=full`}
	code={code}
	language={language}
	renderStackblitz={(source, lang) => (
		<StackblitzEmbed demoId={id} code={source} language={lang} />
	)}
/>

The tab only appears when both code and renderStackblitz are given. Leave either off and the reader gets Preview and Code, which is the right thing for a demo nobody can usefully edit.