This feature is not on a current W3C standards track, but it is supported on the Firefox OS platform. Although implementations may change in the future and it is not supported widely across browsers, it is suitable for use in code dedicated to Firefox OS apps.
goBack method is used to navigate backwards in the browser
By calling this method, the browser
<iframe> changes its location for the previous location available in its navigation history, which sends the according events:
mozbrowserloadstart, and so on.
Not part of any specification.