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As suggested in the NetBeans Emmet issue, it would be useful if the abbreviations support activated by the Tab key was integrated with the Emmet plugin, see: https://github.com/emmetio/emmet/issues/161#issuecomment-20288380
Here is the original ticket for this: https://github.com/emmetio/netbeans/issues/5
Unfortunately no work for this the last couple of months or years :(