HTML5 games are video games that run directly inside a web browser using HTML5, JavaScript, and CSS — no plugin, no app-store download, no separate install.

They render with the Canvas API (2D) or WebGL and WebGPU (2D and 3D), play audio through the Web Audio API, and work across desktops, laptops, tablets, and phones.

The format replaced Flash after Adobe ended Flash Player support on December 31, 2020, and now covers nearly every genre, from .io multiplayer to 3D shooters.

An HTML5 game is a video game that runs directly inside a web browser using HTML5, JavaScript, and CSS — without a plugin, an app-store download, or a separate install.

The term covers casual mini games, .io multiplayer titles, mobile-style runners, and full 2D or 3D experiences served from a URL.

In practice, an HTML5 game is just a small website that happens to be interactive: an index.html, one or more JavaScript files, a folder of art and audio, and (usually) a <canvas> element where the game draws itself.

You open the link, the assets load, and the game runs in the same tab as your email. There is no "Flash player" to enable.

The label "HTML5" is technical shorthand — HTML5 itself is the 2014 W3C standard for HTML, and "HTML5 game" became the umbrella term for everything in the post-Flash era.

You will hear several synonyms in the wild: browser games, web games, instant games, H5 games (especially in Asian markets), and mini games. All refer to the same category.

Key Insight: "If it runs from a URL in a normal browser tab without an install, it is an HTML5 game — regardless of whether the brand calls it 'web,' 'instant,' or 'H5.'" HTML5 games render with the Canvas API for 2D and WebGL or WebGPU for 2D and 3D.