a sentence a day

Without XMPP and Strophe, the work would have been immensely more challenging.

Provides many out-of-the-box tools for solving a wide range of problems

HTTP is limited to simple request-response semantics 

It's certainly possible to build many of the same constructs on top of HTTP, but protocol design is non-trivial. 

comparable HTTP extensions tend to be incompatible with each other, brittle, or primitive. 

More overhead than HTTP for simple chores

minified JavaScript can hinder debugging 

If you are already well versed in Web technologies, feel free to skim the code and skip to the next section. 

they have adequate permis- sions within the room. 

Manipulating roles is necessary for silencing or removing users in a room when they get out of hand