The returned list can be a mixed list of Element, Text or Comment nodes.
Example
let list = up.element.createNodesFromHTML('foo <p>bar</p> baz') // => NodeList(3)
list.length // => 3
list[0] // => Text "foo "
list[1] // => Element "<p>bar</p>"
list[3] // => Text " bar"
Whitespace trimming
Before parsing, whitespace will be trimmed from the beginning and end of the string.
This prevents the creation all-whitespace Text nodes at the edges of the list:
let list = up.element.createNodesFromHTML(' <p>bar</p> ') // => NodeList(1)
list.length // => 1
No changes will be made to whitespace in the middle of the given string.
