# Web engine
The following renderers are used on each platform
| Platform | Code | Renderer | Provider | Browser compatibility |
|---|---|---|---|---|
| Android | WebKit | Ever-green Chromium | ||
| GTK | gtk | WebKit | WebKit2 (minimum version >2.2) | |
| macOS | WebKit | WebKit.WKWebView (bundled with OS) | ||
| QT | qt | WebKit | QtWebEngine / QtWebKit | |
| Windows | edgechromium | Chromium | > .NET Framework 4.6.2 and Edge Runtime installed | Ever-green Chromium |
| Windows | cef | CEF | CEF Python | Chrome 66 |
| Windows | mshtml | MSHTML | DEPRECATED: Internet Explorer MSHTML | IE11 (Windows 10/8/7) |
On Windows renderer is chosen in the following order: edgechromium, mshtml. mshtml is the only renderer that is guaranteed to be available on any system. Edge Runtime must be installed in order to use Edge Chromium on Windows. You can download it from here (opens new window). Distribution guidelines are found here (opens new window).
To change a default renderer set either PYWEBVIEW_GUI environment variable or pass the rendered value to webview.start(gui=code) function parameter. Check for available values in the Code column from the table above.
For example to use CEF on Windows
export PYWEBVIEW_GUI=cef
or
import webview
webview.start(gui='cef')
If you wish to pass custom settings to CEF, refer to this example
To force QT on Linux systems
export PYWEBVIEW_GUI=qt
or
import webview
webview.start(gui='qt')
# Known issues and limitations
# QtWebKit
- Debugging is not supported
← Security