WebGL has the possibility to be used in making virtual worlds that are browser accessible. Kataspace, a few years ago, was a demonstration of that (video from 2010 below) and Google had a short lived project call O3D which had beautifully created virtual worlds done with WebGL
WebGL requires its own development and does not build upon existing things like OpenSim. however, maybe Virtual World Framework does
Virtual World Framework is an open-source platform intended to connect various “collaborative virtual spaces”. in this manner it is an interface allowing Unity content to connect with OpenSim content (like MOSES) via your web browser
. . . using the VWF, a developer can take video lesson plans, objects and avatars and successfully insert them into an existing virtual or created landscape (such as EDGE or Open Sim), interacting with the native objects and users via the VWF interface.
what does this mean for your OpenSim region or world?
could this eventually be the path for browser accessibility to OpenSim?
additional info is available on this wikipedia page