What's new in the WebKitGTK+ 2.21.2 release?
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  - Remove resource load statistics API, it's not ready yet.
  - Add initial implementation of WebDriver advance user insteraction commands.
  - Add introspectable alternatives for functions using vargars to JavaScriptCore GLib API.
  - Implement MouseEvent.buttons.
  - Do TLS error checking on GTlsConnection::accept-certificate to finish the load earlier in case of errors.
  - Fix downloads started by context menu failing in some websites due to missing user agent HTTP header.
  - Avoid painting backing stores for zero-opacity layers.
  - Fix the installation path of API documentation.
  - Fix several crashes and rendering issues.