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Re:A file that’s both an acceptable HTML page and a JPEG (2012) by MapleWalnut on Sunday September 09, 2018 @11:36PM (#17949223)
Here is the output from the handy `file` BSD utility which gave it away to me (see the comment field).

    JPEG image data, JFIF standard 1.01, resolution (DPI), density 300x300, segment length 16, comment: "<html><body><style>body { visibility: hidden; } .n { visibility: visible; position: absolute; ", baseline, precision 8, 1000x667, frames 3

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