答え:できない(少なくとも以下の方法では) Blob URL経由で読み込むvar manifest = [ 'CACHE MANIFEST', 'https://developer.cdn.mozilla.net/media/img/mdn-logo-tiny.png', 'NETWORK:', '*' ].join('\n'); var manifestUrl = URL.createObjectURL(new Blob([manifest], { 'type' : 'text/cache-manifest' })); var html = [ '<!DOCTYPE html>', '<html manifest="'+manifest+'">', '<head><title><\/title><\/head>', '<body>from Blob', '<script>', 'docu