Observability

Accessibility (often abbreviated a11y) is the practice of designing and building websites and apps so they can be used by everyone, including people with visual, motor, auditory, or cognitive disabilities. This involves proper semantic markup, keyboard navigation support, sufficient color contrast, and screen reader compatibility. Beyond being an ethical responsibility, accessibility is increasingly a legal requirement in many jurisdictions.

A design system is a collection of reusable components, guidelines, and standards that ensure visual and functional consistency across a product or suite of products. It typically includes a component library, design tokens, typography rules, color palettes, and documentation. Design systems bridge the gap between designers and developers, enabling teams to build interfaces faster while maintaining a unified look and feel.

Semantic HTML means using HTML elements that clearly describe their meaning and purpose, such as `<article>`, `<nav>`, `<header>`, and `<section>`, instead of generic `<div>` tags. This practice improves accessibility for screen readers, boosts SEO by helping search engines understand page structure, and makes code far more readable for other developers. It's considered a foundational best practice in modern web development.

CSS Grid is a two-dimensional layout system that lets you define rows and columns simultaneously, making it ideal for complex page layouts. Unlike Flexbox which works in one axis at a time, Grid allows you to place items precisely in both horizontal and vertical directions using named areas or line numbers. Features like `grid-template-areas`, `auto-fill`, and `minmax()` make it possible to create responsive layouts with minimal code.

CI/CD (Continuous Integration / Continuous Deployment) is a set of practices that automate building, testing, and deploying code every time a developer pushes changes. Continuous Integration merges code into a shared branch frequently and runs automated tests, while Continuous Deployment automatically releases validated changes to production. Together they form the backbone of modern software delivery, reducing manual errors and accelerating release cycles.

JSX (JavaScript XML) is a syntax extension for JavaScript used primarily in React that lets you write HTML-like markup directly within your JavaScript code. It gets transpiled by tools like Babel or SWC into regular `React.createElement()` calls before reaching the browser. JSX supports embedding dynamic expressions with curly braces, conditional rendering, and mapping over arrays, making it a powerful and intuitive way to describe UI structures declaratively.