Not with that attitude:

    <style>
    @keyframes blink {
        0% { opacity: 1; }
        50% { opacity: 0; }
        100% { opacity: 1; }
    }
    
    blink { animation: blink 0.7s infinite; }
    </style>

    <blink>This guy blinks.</blink>

Since <BLINK> is gone, `BEHAVIOR=SLIDE` is the closest you'll get.

<MARQUEE DIRECTION="DOWN" BEHAVIOR="SLIDE">Slide</MARQUEE>