3.4. Web Compatibility

3.4.1. WebView Compatibility

If device implementations provide a complete implementation of the android.webkit.Webview API, they:

• [C-1-1] MUST report android.software.webview.
• [C-1-2] MUST use the Chromium Project build from the upstream Android Open Source Project on the Android ANDROID_VERSION branch for the implementation of the android.webkit.WebView API.
• [C-1-3] The user agent string reported by the WebView MUST be in this format:

Mozilla/5.0 (Linux; Android $(VERSION); $(MODEL) Build/$(BUILD); wv)
AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 $(CHROMIUM_VER) Mobile
Safari/537.36

*   The value of the $(VERSION) string MUST be the same as the value for
    android.os.Build.VERSION.RELEASE.
*   The value of the $(MODEL) string MUST be the same as the value for
    android.os.Build.MODEL.
*   The value of the $(BUILD) string MUST be the same as the value for
    android.os.Build.ID.
*   The value of the $(CHROMIUM_VER) string MUST be the version of Chromium
    in the upstream Android Open Source Project.
*   Device implementations MAY omit Mobile in the user agent string.

• The WebView component SHOULD include support for as many HTML5 features as possible and if it supports the feature SHOULD conform to the HTML5 specification.

3.4.2. Browser Compatibility

If device implementations include a standalone Browser application for general web browsing, they:

• [C-1-1] MUST support each of these APIs associated with HTML5: * application cache/offline operation * <video> tag * geolocation
• [C-1-2] MUST support the HTML5/W3C webstorage API and SHOULD support the HTML5/W3C IndexedDB API. Note that as the web development standards bodies are transitioning to favor IndexedDB over webstorage, IndexedDB is expected to become a required component in a future version of Android.
• MAY ship a custom user agent string in the standalone Browser application.
• SHOULD implement support for as much of HTML5 as possible on the standalone Browser application (whether based on the upstream WebKit Browser application or a third-party replacement).

However, If device implementations do not include a standalone Browser application, they:

• [C-2-1] MUST still support the public intent patterns as described in section 3.2.3.1.