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<!DOCTYPE html>
<html>
<head>
<style>
  #frameDiv {
    width: 400px;
    height: 180px;
    margin: 20px;
    position: relative;
    border: solid black 1px;
    background-color: rgb(205, 242, 205);
  }
  svg {
    position: absolute;
    height: 100%;
    width: 100%;
    left: 0;
    top: 0;
  }
  img {
    position: absolute;
    z-index: 1;
    width: 70px;
    offset-path: path('M 50 80 C 150 -20 250 180 350 80');
    animation: moveFish 4s 4;
  }
  @keyframes moveFish {
    0%    { offset-distance: 0%; }
    100%  { offset-distance: 100%; }
  }
</style>
</head>
<body>
<h1>The offset-distance property amnimated</h1>
<div id="frameDiv">