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Languages & runtimes · #html5
Learn how to diagnose and fix layout collapse when HTML5 semantic elements like <main> and <section> behave as inline elements instead of block elements.
Learn why HTML5 Canvas looks blurry on Retina screens and how to fix it by aligning the backing store with devicePixelRatio.
Discover how the native <dialog> element simplifies modal creation: focus trapping, inert background, Esc‑dismissal, and CSS ::backdrop styling. Learn a concrete example, trade‑offs, and how to audit your current modals for a smooth migration.
Learn how to implement HTML5 LocalStorage for persistent client‑side data. This guide covers JSON serialization, storage limits, and security constraints for managing state without a server.
Learn how to shift intensive HTML5 canvas drawing to a background worker with OffscreenCanvas, keeping the main thread free for user interactions and delivering smooth, high‑frame‑rate graphics.