# Package com.google.gwt.useragent.client

- Interface Summary
  Interface | Description
  --- | ---
  UserAgentAsserter.UserAgentProperty | Interface to provide both the compile time and runtime `user.agent` selection property value.

- Class Summary
  Class | Description
  --- | ---
  UserAgentAsserter | Helper class, which, during startup, asserts that the specified user.agent selection property value indeed matches the expected value for this browser / user agent, thus avoid long hours debugging strange error messages when a single user agent compile, typically created for testing purposes, ends up being executed in the wrong browser.
  UserAgentAsserter.UserAgentPropertyDisabled | Default `UserAgentAsserter.UserAgentProperty` implementation used when `user.agent.runtimeWarning` is `false`.