No-Library (pure JS), HTML, CSS, JavaScript
Definition lists are preferred over a list that contains definitions because it's easier to style and more semantic, helping other programs parse the information
Last one wins even if the code is never reached
Micro tasks are exhausted before a macrotask is run
Errors in then handlers are not caught but the second argument to then
Mootools 1.4.2, HTML, CSS, JavaScript
RxJS 5 merge