WebGL not working
Problem is with some files are not included in the WebGL build and once you enable them build succeeds, but the browser throws the following window.

Its related to fixing namespace issues with enabling the dll files to the build. https://github.com/KhronosGroup/UnityGLTF/issues/436
mkorpinen, do you know any more information about how the namespaces need to be fixed? (I read issue #436 but didn't find any specifics about namespacing issues).
Does anybody have any ideas about what might be going on. My c# and unity levels are just a little bit above basic but I'm willing to tackle this if anyone has any pointers.
To solve the dlopen / emscripten / linking error in the WebGL Build, try @kolodi's pull request #367. That solved it for me.
Please update to the latest version and open a new issue if the problem persists. Thanks!