LabelledBy Recursion is not actually recursive, so it should be renamed.

[cookiecrook]

LabelledBy Recursion is not actually recursive, so it (and the WPT test file) should be renamed.

Originally posted by @cookiecrook in #209 (comment)

After the outcome of #209, it's clear this is not actually "recursion" so consider renaming that step name, ID, and test file.

[cookiecrook]

Let's just call it "traversal" instead of "recursion" I think that remains accurate. There may also be some minor word smithing to make it clear it doesn't loop back into the algorithm more than once... As opposed to a recursive inward loop.