[font-loading] "pending on the environment" not clear about what "document is still loading" means #1081
Description
https://drafts.csswg.org/css-font-loading/#fontfaceset-pending-on-the-environment
Given the other things on the list, this is probably supposed to match DOMContentLoaded timing or some document.readyState, but it doesn't link to anything that makes this unambiguous. Please link to something :)