blink wont work, but marquee will

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>

What version of Macromedia Dreamweaver did you use to make this?

Wasn't it more like this?

    <style>
    @keyframes blink {
        0% { visibility: visible; }
        50% { visibility: hidden; }
        100% { visibility: visible; }
    }
    
    blink { animation: blink 0.7s steps(1, end) infinite; }
    </style>

    <blink>This guy blinks.</blink>

people who use css are not welcome here.

It’s OK if it’s a polyfill.

Wait, not far enough back…

It’s OK if it’s a shim.

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

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

<MARK>FTFY</MARK>