line-effect.html

<p style="line-height: 18px; font-size: 18px;  font-family: times;">
<script>
for (var line=1; line<60; line++) {
  for(var i=1;i<29;i++) {
    var s = (Math.floor((Math.random()*2)%2)) ? "╱" : "╲";
    document.write(s);
  }
  document.writeln("<br>");
}
</script>
</p>