From 4f3ac961f9763a653bdfbf5d26cd39f744d657f6 Mon Sep 17 00:00:00 2001
From: Anne van Kesteren
Let urlRecord be the result of encoding-parsing a URL given - url, relative to this's relevant settings object.
Let urlRecord be the result of parsing a URL + given url, relative to this's relevant settings + object.
If urlRecord is failure, then return an early error result for a