In React apps with SSR, reading localStorage has meant managing the first render with useEffect and state. The browser() API lets you express browser-only rendering with use(browser()) and hand the pending UI to Suspense. Here is how it works.

The Enter key that confirms an IME conversion can send a half-written message by mistake. This article explains why isComposing is combined with the deprecated keyCode === 229 to keep conversion-confirming Enter keys out of your submit logic.

With so many charting libraries available, why was TanStack Charts built? We look at the style it inherited from Observable Plot and its focus on living inside an application, then overlay event annotations on a revenue line chart in React.

Pinning GitHub Actions to full commit SHAs improves security but makes updates tedious. `pnpm update --include-github-actions`, added in pnpm 11.16.0, updates packages and Actions with a single command. This article covers the basics.

Changing how a video looks by playback or mute state has meant syncing CSS classes from JavaScript events. Media state pseudo-classes let CSS select browser-managed states directly. This article covers all seven, plus :has().

With flex-wrap: wrap, the last line often holds just a few items, leaving the lines badly unbalanced. flex-wrap: balance keeps the line count that normal wrapping produces while redistributing flex items so each line comes out about the same length.

Zod 4.5 adds z.compile(), which turns a schema into JavaScript optimized at runtime. A compiled schema keeps the same API as a regular schema while validating complex data faster. This article covers the basics and how it works.

Shapes built with clip-path's path() are hard to make responsive because its coordinates are fixed pixels. shape() defines curves with percentages, CSS units, and custom properties. This article builds a resizable speech bubble and a motion path.

Chrome DevTools sends GET /.well-known/appspecific/com.chrome.devtools.json to detect your local project as a Workspace. This article covers why the 404 is harmless, what returning JSON enables, security notes, and support in Vite and Next.js.

ChatGPT desktop's built-in browser now supports WebMCP, which lets a website expose its features as tools for AI agents. We build a WebMCP-enabled TODO app and inspect the arguments and results of the Site tools Codex calls from its execution history.

IndexedDB is an asynchronous, transactional database for storing structured data in the browser. Learn its fundamentals through the native API, then build a task management app with React and Dexie.js.

Forgetting to restore a spy in Vitest lets mock state leak into other tests. Since Vitest 3.2.0, assigning the return value of `vi.spyOn()` to a `using` declaration restores the original implementation automatically when the scope exits.