Add a baseURI option to resolve to arbitrary absolute URLs #961
Description
I'm running into something similar to #671: relative URLs don't resolve to the expected absolute URL.
I use Readability from a WebExtension background script. The script fetch()es HTML resources and parses them into DOMs using the DOMParser browser API.
The resulting absolute URLs look something like moz-extension://<extension-base-url>/<relative-link-here>, since Readability gets the base URI from document.baseURI (which is window.location by default):
Line 457 in 04fd32f
In #671, getting the expected absolute URLs was achieved by passing JSDOM a url option. This is now well-documented on the README:
Line 100 in 04fd32f
However, DOMParser doesn't have a url option.
A workaround I've found is to inject a <base> element into the document's <head> before handing it over to Readability. This works because document.baseURI resolves to whatever is in <base>, only falling back to window.location if no <base> is found.
This works but feels a little bit brittle (it could break if Readability changes how it deals with relative URLs internally). Have we considered adding a baseURI option that, if explicitly set, overrides document.baseURI?