Blog

e2e is a testing framework that combines natural-language actions with element-based actions and assertions. This article builds tests for a Todo app that let AI perform the actions and verify the results in code.

Card padding plus the margins of the first and last children can leave more space at the edges than intended. margin-trim removes margins at a container's edges while keeping the spacing between elements. Learn the basics through a card example.

When you embed a comment section or form in an iframe, the frame height often doesn't match the content, causing scrollbars or empty space. frame-sizing lets the iframe use its content's height, with the embedded document's permission.

Browsers sometimes lock scrolling to a single axis, either vertical or horizontal. The scroll-axis-lock property lets you disable this axis locking. This article covers the basics of using scroll-axis-lock.

The Skills Extension lets clients discover and retrieve Agent Skills over MCP. Learn why it was designed, how skills are loaded progressively, and how to implement and inspect a skill server with Node.js.

With json-render's Jev integration you prepare component candidates that already carry their labels and data, and let the model pick and arrange them. This article walks through how it works and how it differs from ordinary json-render.

Jev is a model that takes a state and returns choice decisions, graded scores, and the probability that something is true. This article evaluates support inquiries in TypeScript and routes them to departments or human review based on actual outputs.

TanStack Redact is a lightweight runtime that keeps React's component and Hooks model but renders synchronously, so some APIs behave differently. This article covers setup and design, and compares startTransition in React and Redact.

Fragment Refs in React 19.3 let you work with multiple DOM elements without adding a wrapper element. Using a shipping address form as an example, this article shows how to use Fragment Refs.

Using AI agents at work requires access to internal knowledge and systems, plus a way to share what they produce. Cloudflare OS is a workspace for running agents and small apps. This article covers running it locally, the runtime, and permissions.

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.