CSS Offset Path Sample

Available in Chrome 46+ | View on GitHub | Browse Samples

Background

CSS Offset Paths allow web pages to animate graphical objects along paths, specified using CSS.

It introduces the following new CSS properties: offset-distance, offset-path, and offset-rotate.

HTML Snippet

   <svg xmlns="http://www.w3.org/2000/svg"
        width="700"
        height="450"
        viewBox="350 0 1400 900">
      <rect x="595"
            y="423"
            width="610"
            height="377"
            fill="blue" />
      <polygon points="506,423 900,190 1294,423"
               fill="yellow" />
      <polygon points="993,245 993,190 1086,190 1086,300"
               fill="red" />
      <path d="M900,190 L993,245 V201 A11,11 0 0,1 1004,190 H1075 A11,11 0 0,1 1086,201 V300 L1294,423 H1216 A11,11 0 0,0 1205,434 V789 A11,11 0 0,1 1194,800 H606 A11,11 0 0,1 595,789 V434 A11,11 0 0,0 584,423 H506 L900,190"
               fill="none"
               stroke="black"
               stroke-width="13"
               stroke-linejoin="round"
               stroke-linecap="round" />
      <path id="firstScissorHalf"
               d="M30,0 H-10 A10,10 0 0,0 -20,10 A20,20 0 1,1 -40,-10 H20 A10,10 0 0,1 30,0 M-40,20 A10,10 1 0,0 -40,0 A10,10 1 0,0 -40,20 M0,0"
               transform="translate(0,0)"
               fill="green"
               stroke="black"
               stroke-width="5"
               stroke-linejoin="round"
               stroke-linecap="round"
               fill-rule="evenodd" />
      <path id="secondScissorHalf"
               d="M30,0 H-10 A10,10 0 0,1 -20,-10 A20,20 0 1,0 -40,10 H20 A10,10 0 0,0 30,0 M-40,-20 A10,10 1 0,0 -40,0 A10,10 1 0,0 -40,-20 M0,0"
               transform="translate(0,0)"
               fill="forestgreen"
               stroke="black"
               stroke-width="5"
               stroke-linejoin="round"
               stroke-linecap="round"
               fill-rule="evenodd" />
   </svg>

CSS Snippet

   #firstScissorHalf {
      offset-path: path('M900,190  L993,245 V201  A11,11 0 0,1 1004,190  H1075  A11,11 0 0,1 1086,201  V300  L1294,423 H1216  A11,11 0 0,0 1205,434  V789  A11,11 0 0,1 1194,800  H606  A11,11 0 0,1 595,789  V434  A11,11 0 0,0 584,423  H506 L900,190');
   }

   #secondScissorHalf {
      offset-path: path('M900,190  L993,245 V201  A11,11 0 0,1 1004,190  H1075  A11,11 0 0,1 1086,201  V300  L1294,423 H1216  A11,11 0 0,0 1205,434  V789  A11,11 0 0,1 1194,800  H606  A11,11 0 0,1 595,789  V434  A11,11 0 0,0 584,423  H506 L900,190');
   }

JavaScript Snippet

   var firstScissorHalf = document.querySelector('#firstScissorHalf');
   var secondScissorHalf = document.querySelector('#secondScissorHalf');

   var positionKeyframes = [{offsetDistance: '0%'}, {offsetDistance: '100%'}];
   var positionTiming = {duration: 12000, iterations: Infinity};
   firstScissorHalf.animate(positionKeyframes, positionTiming);
   secondScissorHalf.animate(positionKeyframes, positionTiming);

   var firstRotationKeyframes = [
      {offsetRotate: 'auto 0deg'},
      {offsetRotate: 'auto -45deg'},
      {offsetRotate: 'auto 0deg'}
   ];
   var secondRotationKeyframes = [
      {offsetRotate: 'auto 0deg'},
      {offsetRotate: 'auto 45deg'},
      {offsetRotate: 'auto 0deg'}
   ];
   var rotationTiming = {duration: 1000, iterations: Infinity};
   firstScissorHalf.animate(firstRotationKeyframes, rotationTiming);
   secondScissorHalf.animate(secondRotationKeyframes, rotationTiming);