やばいSnippet

snippet.js

var style = document.createElement("style");
style.innerHTML =
[`
@keyframes blink {
  75% { opacity: 0.0; }
}
@-webkit-keyframes blink {
  75% { opacity: 0.0; }
}
body {
  animation: blink 1s step-end infinite;
  -webkit-animation: blink 1s step-end infinite;
}
`,
`
body {
    width: 450px;
    margin: 0 auto;
    overflow: hidden;
    white-space: nowrap;
    box-sizing: border-box;
    animation: marquee 50s linear infinite;
}

/* Make it move */
@keyframes marquee {
    0%   { text-indent: 27.5em }
    100% { text-indent: -105em }
}

`][~~Math.floor(Math.random()*2)]
document.head.appendChild(style);