html

Semantic HTML uses meaningful elements like <header>, <nav>, <main>, <article>, and <footer> instead of generic <div> tags. I structure content with proper heading hierarchy (<h1> to <h6>). Semantic mark

HTML5 form validation uses attributes like required, pattern, min, max, and type to validate input. I leverage native validation before JavaScript. The <label> element associates text with inputs for accessibility. Input types like email, tel, u

Letting users paste rich content is a product requirement that can become a security nightmare. I never try to write my own sanitizer. Instead, I run HTML through DOMPurify using JSDOM on the server and keep the allowlist small (minimal tags + attribu

Meta tags provide metadata about HTML documents for search engines and social media. I use <meta name="description"> for search result snippets (150-160 characters). The viewport meta tag ensures responsive design on mobile devices. Open Graph t

Web Components create reusable custom elements with encapsulated functionality. I use Custom Elements API to define new HTML tags with customElements.define(). Shadow DOM provides style and markup encapsulation preventing CSS leakage. HTML Templates w