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Answer by HarshadK · Jun 27, 2017 at 10:07 AM
What you are seeing is spatial aliasing which is discussed in this article from Wikipedia about Spatial anti-aliasing. What you are experiencing is as shown by Figure 1-a from the example.
It might be because of settings for the build platform (WebGL in this case) does not apply enough anti-aliasing causing this aliasing artifact. Just see how the other geometry in the scene also has aliasing artifacts in it.