testing/web-platform/tests/service-workers/service-worker/resources/fetch-canvas-tainting-double-write-worker.js


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self.addEventListener('fetch', (event) => {
  url = new URL(event.request.url);
  if (url.search == '?PNGIMAGE') {
    localUrl = new URL(url.pathname + url.search, self.location);
    event.respondWith(fetch(localUrl));
  }
});