Android WebView

To run WPT on WebView on an Android device, some additional set-up is required.

Currently, Android WebView support is experimental.

Please check Chrome for Android for the common instructions for Android support first.
Install an up-to-date version of system webview shell:
- Go to chromium-browser-snapshots
- Find the subdirectory with the highest number and click it.
- Download chrome-android.zip file and unzip it.
- Install SystemWebViewShell.apk.
- On emulator, system webview shell may already be installed by default. Then you may need to remove the existing apk:
  - Choose a userdebug build.
  - Run an emulator with writable system partition from command line
If you have an issue with ChromeDriver version, try removing _venv/bin/chromedriver such that wpt runner can install a matching version automatically. Failing that, please check your environment path and make sure that no other ChromeDriver is used.

Example command line:

./wpt run --test-type=testharness android_webview <TESTS>

Note that there is no support for channel or automatic installation. The test will be run against the current WebView version installed on the device.
Reftests are not supported at the moment.