[runarberg]

Fun fact: <blink> is an HTMLUnknownElement. What GGGP did is essentially the same as:

    blink {
      animation: blink 1s steps(2, jump-none) infinite;
    }

    @keyframes blink {
      to {
        opacity: 0;
      }
    }

Now when you write <blink> in your HTML you will essentially get an HTMLUnknownElement with the specific style of blinking every ½ second.