Cant display stl files in ie 9

```
What steps will reproduce the problem?
1. Load your stl demo file in ie 9

What is the expected output? What do you see instead?
I see a blank square where the image should be

What version of the product are you using? On what operating system?
ie 9. Your demo works when you use the Flash version, but not the standard
javascript version.

Please provide any additional information below.
I have tried it on 3 computers and neither your demo or our files display. Any
advise please?

```

Original issue reported on code.google.com by `undercut...@gmail.com` on 19 Mar 2013 at 12:00

Start with the STL demo in IE 9 and reproduce the blank square using the supplied steps. Compare the standard JavaScript path with the working Flash version, then verify that STL files render in IE 9 without regressing the Flash path.

Written by the indexing model from the issue text.