[javascript] Best way to get child nodes

Sounds like you're overthinking it. You've observed the difference between childNodes and children, which is that childNodes contains all nodes, including text nodes consisting entirely of whitespace, while children is a collection of just the child nodes that are elements. That's really all there is to it.

There is nothing unpredictable about either collection, although there are a couple of issues to be aware of:

  • IE <= 8 do not include white space-only text nodes in childNodes while other browsers do
  • IE <= 8 includes comment nodes within children while other browsers only have elements

children, firstElementChild and friends are just conveniences, presenting a filtered view of the DOM restricted to just elements.

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