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Setting was previously preload="auto". While preload="auto" *does not* cause a full upfront download on Firefox, Abrowser, IceCat or Chromium, a user reported on the LibrePlanet mailing list that it was causing a full download on their browser. The specifications leave it up to the browser do decide whether to download, but it makes sense to do what we can to avoid surprising people on low bandwidth/quota internet connections. https://html.spec.whatwg.org/multipage/media.html#attr-media-preload Further, media.libreplanet.org (one of MediaGoblin's biggest users) has implement this change locally, so it makes sense for us to stay in sync. Signed-off-by: Ben Sturmfels <ben@sturm.com.au>