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Remove $el_to_style from the widget javascript code; '' now defaults to this.$el...
Remove $el_to_style from the widget javascript code; '' now defaults to this.$el This seems to make it easiest to select the top-level element. An alternative is to use special syntax for top-level elements, like in https://github.com/ipython/ipython/pull/6185 This will be followed up by other fixes that let the user set specific common properties of different elements. This change also adds the .addBack() call, which means that nonempty selectors now apply to this.$el and its descendants, rather than just the descendants of this.$el.

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logtopics.rst
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Log Topic Specification

we use pyzmq to broadcast log events over a PUB socket. Engines, Controllers, etc. can all broadcast. SUB sockets can be used to view the logs, and ZMQ topics are used to help select out what to follow.

the PUBHandler object that emits the logs can ascribe topics to log messages. The order is:

<root_topic>.<loglevel>.<subtopic>[.<etc>]

root_topic is specified as an attribute