This content originally appeared on DEV Community and was authored by Ayako yk
This blog marks the beginning of a new chapter in my learning journey—relearning JavaScript. After exploring HTTP(S) in previous posts, I’m excited to dive into JavaScript next. It’s going to be a long process, so each post will be short, focusing on specific topics and, hopefully, including some advanced insights.
Let’s start with the very basics of JavaScript.
Introduction
JavaScript is a scripting language that makes plain HTML interactive. It runs on devices with a JavaScript engine, which parses the script, compiles it into machine code, and executes it.
What In-Browser JavaScript Can Do:
- Enhance HTML by making it interactive
- Send requests to servers and handle responses (e.g., AJAX)
- Manage cookies and authentication
- Store data in local storage for user sessions and offline use
What In-Browser JavaScript Cannot Do:
For user safety, JavaScript is limited in accessing sensitive system-level features:
- It cannot directly access files, cameras, or microphones without explicit user permission
- It cannot interact with other tabs or windows unless explicitly allowed (e.g., via CORS or the Same-Origin Policy)
These restrictions ensure security and privacy.
This content originally appeared on DEV Community and was authored by Ayako yk
Ayako yk | Sciencx (2025-01-21T04:16:11+00:00) Relearning JavaScript: An Introduction to In-Browser Capabilities. Retrieved from https://www.scien.cx/2025/01/21/relearning-javascript-an-introduction-to-in-browser-capabilities/
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