css-sw-same-origin-substitution-iframe.sub.html

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<!DOCTYPE html>

<meta charset="utf-8">

<title>iframe: cross-origin CSS request, service worker substitutes a same-origin response</title>

<!-- Cross-origin stylesheet request. The controlling service worker intercepts

     it and responds with a fetch() of a same-origin stylesheet, so the content

     is same-origin and cssRules must be readable. -->

<link rel="stylesheet" type="text/css"

      href="{{location[scheme]}}://{{hosts[alt][]}}:{{location[port]}}/service-workers/service-worker/resources/css-sw-substitute-marker.css">