Anne, The commit on the W3C CORS spec in May 2012 [1] has moved various useful texts explaining decisions made and reasons to the CORS FAQ wiki page [2]. The Fetch spec [3] inherited the CORS concepts/algorithms but seems didn't inherit stuff in the FAQ.
Could you please try to guide readers of the Fetch spec to reach the contents placed at the FAQ wiki page (e.g. a link) or import them to the Fetch spec as <p class="note"></p>s? [1] https://dvcs.w3.org/hg/cors/rev/5d553e422c6f [2] http://www.w3.org/wiki/CORS [3] http://fetch.spec.whatwg.org/
