AR/VR WebXR Basics

WebXR brings AR and VR to the web browser. Users open a link and enter an immersive experience without downloading an app. Developers write code with standard web tools and reach phones, headsets, and computers from one project.

What WebXR Does

WebXR is a browser standard that connects web pages to AR and VR hardware. The standard gives a page access to head position, controller input, hand data, and camera-based tracking, when the user grants permission. Pages draw 3D scenes with web graphics technology and send the images to the device display.

Session Types

Immersive VR

The page takes over the headset display and shows a fully virtual scene.

Immersive AR

The page draws virtual objects over the live camera view or see-through display.

Inline

The page shows a 3D scene inside a normal web page, with mouse or touch control.

Diagram: WebXR Flow

User opens a web link (HTTPS)
        ↓
Page checks for XR support
        ↓
User taps "Enter VR" or "View in AR"
        ↓
Browser asks for permission
        ↓
Session starts → page draws every frame

Popular Tools

A-Frame

A-Frame lets you build scenes with simple HTML-style tags. Beginners create a working VR scene in a few lines.

three.js

three.js is a popular 3D library that offers full control over graphics, animation, and lighting.

Babylon.js

Babylon.js provides a complete engine with tools, physics, and strong WebXR support.

Simple Code Examples

The first snippet checks whether the browser supports VR.

if (navigator.xr) {
  navigator.xr.isSessionSupported('immersive-vr').then(function (supported) {
    if (supported) {
      // Show the Enter VR button
    }
  });
}

The second snippet builds a small scene with A-Frame.

<a-scene>
  <a-box position="0 1 -3" color="#4CC3D9"></a-box>
  <a-sky color="#ECECEC"></a-sky>
</a-scene>

Real Example

A furniture shop adds a "View in your room" button to a product page. A shopper taps the button on a phone, grants camera permission, and sees a virtual armchair on the floor. No app store visit is needed, and the shopper shares the page link with family.

Benefits

• No installation, so more people try the experience.
• One codebase serves many devices.
• Updates reach users instantly.
• Links make sharing simple.

Limitations

• Performance trails native apps on complex scenes.
• Browser and device support varies, so testing matters.
• Some advanced headset features arrive later on the web.
• Pages require a secure HTTPS connection.

Best Practices

Keep models small and textures compressed so pages load quickly. Show a loading indicator and explain why the camera or motion access is needed. Provide a regular 3D or image view as a fallback for unsupported devices. Test on a real headset and a real phone, because desktop emulators hide performance and comfort issues.

When To Choose WebXR

Marketing campaigns, product previews, education demos, and quick prototypes suit WebXR well. Heavy games and advanced simulations usually need native engines such as Unity or Unreal. Many teams prototype on the web first and move to native tools when the idea proves itself.

Beginner Practice Idea

Create a plain text file with the A-Frame snippet above, add the A-Frame library script to the page head, and host it on a secure site. Open the link on a phone and a headset browser. Change the box color, size, and position, and refresh each time. Small edits build confidence quickly.

Performance and Loading Tips

Browsers load pages over a network, so file size matters more on the web than in installed apps. Compress 3D models into compact formats such as glTF with Draco compression. Resize textures to the smallest size that still looks sharp. Load heavy assets after the first scene appears, and show a progress bar so users know the page is working.