JiaxiangBU opened a new issue #12892: The markdown of installation page partly doesn't work URL: https://github.com/apache/incubator-mxnet/issues/12892 In the [installation](https://mxnet.incubator.apache.org/install/index.html?platform=MacOS&language=R&processor=CPU) page, the markdown fails for the choice (Mac, R, CPU). Here is the screenshot. 
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