the modern web platform, on Android

What this engine actually supports

Live feature detection, evaluated on this engine right now — not a spec sheet. Open the same URL in Chrome, Brave, Firefox and Cefrium to compare what each supports.

Modern web platform — shipped here, lagged or missing in System WebView

Frontier device & GPU APIs — absent in the System WebView

The Android System WebView exposes none of these. In a secure context this Cefrium build exposes most of them — WebGPU even returns a working adapter; the live results below show exactly which. Web Bluetooth, WebUSB and Web Serial are wired end-to-end (since 0.5.0): requestDevice()/requestPort() routes to the app via CefDeviceChooserHandler, so your code presents the picker. WebAuthn / passkeys also work end-to-end (Android 14+) through the system Credential Manager - create and sign in with a passkey, validated against webauthn.io. WebGPU returns a working adapter; WebHID and Built-in AI are not viable on Android.

Device & media — newly wired in Cefrium 0.3.0 (try the live demos below)

These need an Android permission bridge and capture/media plumbing to work in an embedded engine. Cefrium 0.3.0 wires them end-to-end — scroll down to grant a permission and see them run.

Reveal on scroll — zero JavaScript

Cards fade and rise as they enter the viewport via a CSS view() timeline. WebView: not supported.

Parallax depth

A background layer drifts against the page via animation-timeline: scroll().

A component that adapts to its OWN size

Drag the handle at the bottom-right of the box to resize it. The card switches layout based on its width, not the viewport's.

A tooltip that positions & flips itself

Pure CSS anchoring with position-try-fallbacks and an arrow that re-points itself using an anchored container query.

Top-layer dialog with enter/exit animation

The Popover API plus @starting-style, transition-behavior: allow-discrete and overlay.

Morphing state changes

A same-document View Transition smoothly morphs the card between sizes. WebView lacks cross-document transitions entirely.

Parents that react to children

The container restyles selected rows with no JavaScript — label:has(input:checked).

Pick your stack:

Wide-gamut, computed color

Swatches generated with oklch() and blended with color-mix(in oklch, …) — perceptually uniform color.

Text-to-speech from JavaScript

Synthesize speech on-device via speechSynthesis.

Where am I? — device location

Tap to request your location. Cefrium routes the prompt through Android's permission system (you'll see a native Allow / Block dialog) and the OS location provider — the same flow a real browser uses. Nothing is stored.

Live camera & microphone

Tap to open the camera and mic. The preview is live and never leaves the device; tap Stop to release the hardware immediately. This is the same capture pipeline a video call uses.

Lock-screen media controls

Play the demo tone, then check your lock screen / notification shade — Cefrium surfaces play/pause controls with title and metadata via navigator.mediaSession.