Why WebAssembly Became the 4th Web Language and What It Means for Developers

On December 5, 2019, the W3C announced that the WebAssembly core specification had become an official Web standard.

WebAssembly core specification officially becomes a Web standard.

Following HTML, CSS, and JavaScript, WebAssembly became the fourth Web language.

WebAssembly is a safe, portable, low‑level binary format that can execute code efficiently in web browsers.

Its arrival expands the range of applications that can run on the Web; with the growing prevalence of machine learning and artificial intelligence, running high‑performance programs safely in browsers is increasingly important.

Essentially, WebAssembly is a virtual instruction set architecture that enables ultra‑high‑performance programs to run on the Web, suitable for audio, video, graphics, 3D, games, and more.

The power of WebAssembly comes from its virtual machine and execution environment, allowing locally compiled code to run in a page with performance close to native execution.

Key features of WebAssembly include:

Threads, shared memory, and atomic memory access

Vector operations for parallel loop execution

Direct reference to host objects

Function calls without additional stack space

Interaction with JavaScript by loading WebAssembly modules as ES6 modules

Long‑term goals include:

Improved garbage collection

Debugging interfaces

WebAssembly System Interface (access to system files, network, and other low‑level functionalities)

This article is translated and compiled from the W3C press release: https://www.w3.org/2019/12/pressrelease-wasm-rec.html.en