The GWT compiler has a namespace option (-Xnamespace) you can turn on during compilation. But turning it on can produce bugs, especially when using code splitting so this option has been deactivated for now.--
The reasoning why this change has been made can be read in the code review: https://gwt-review.googlesource.com/#/c/13704/
If you don't want to see the warning anymore, remove the compiler option.
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