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HTML

              
                <pre>svg .cat {
  animation: spin 5s linear infinite;
  transform-origin: 50% 50%;
}</pre>

<svg width="465" viewBox="0 0 300 74"><path class="cat" d="M19.1 0a3 3 0 0 0-2.3 1.5C9.8 13.5 4.4 26 4.3 41.3a16.4 16.4 0 0 0-4.3.8L.6 44a15.6 15.6 0 0 1 3.7-.7 31 31 0 0 0 .4 4l-1.9.8 1 1.8 1.3-.6.6 2.1a19.5 19.5 0 0 0-2.1 2L5 54.6l1.4-1.3A33.3 33.3 0 0 0 37 74h12c13.7 0 26.1-8.3 30.8-20.4l1.3 1.1 1.4-1.4a22 22 0 0 0-2-1.8l.6-2.2 1.2.6.8-1.8c-.4-.2-1-.6-1.7-.8a31.7 31.7 0 0 0 .3-4 15.2 15.2 0 0 1 3.7.7l.6-2a16.6 16.6 0 0 0-4.3-.7C81.3 25.5 75 15.1 69.3 3.7a3 3 0 0 0-5.2-.1L59 12.8a123.2 123.2 0 0 0-31-1L21.9 1.6A3 3 0 0 0 19.1 0zm3 13.7l1.7 2.8a3 3 0 0 0 2.3 1.5c-.2 4.7 1.4 12.1 6 12 4-.1 5.7-4.2 6.4-7.5.6 2.9 2.7 5.4 5.5 5.5 3.9 0 5.3-3 6.1-6 .2 3.6 1.8 8 5.9 8 5.8 0 6.6-7.3 6.8-12a29 29 0 0 0 2.2-3.8 10.3 10.3 0 0 0-.2 1.8 3 3 0 0 0 1.7 2.7 9.8 9.8 0 0 0 4.1 1.1 54.7 54.7 0 0 1 5.1 21.8l-2.2.4.5 2c.6-.1 1.1-.3 1.7-.3l-.1 2.2a15 15 0 0 0-2 .2l.3 2a10.6 10.6 0 0 1 1.3-.2c0 .5-.2.9-.3 1.3l-1-.2-.3 2 .7.1A26.7 26.7 0 0 1 49 68H37a27.3 27.3 0 0 1-25.1-17h.4l-.2-2-.9.1L11 48l1.1.1.3-2a14.9 14.9 0 0 0-1.8-.1l-.2-2.3 1.6.3.6-1.9a22.5 22.5 0 0 0-2.3-.4 61.4 61.4 0 0 1 5.1-23.8 9 9 0 0 0 5.2-1.1 3.5 3.5 0 0 0 1.6-3zm3 16.3c-1 0-2 1.8-2 4s1 4 2 4 2-1.8 2-4-.9-4-2-4zM61 30c-1.1 0-2 1.8-2 4s.9 4 2 4 2-1.8 2-4-.9-4-2-4zM43 41c-1.6 0-3 .9-3 2a1.8 1.8 0 0 0 1 1.5v4.6a5.3 5.3 0 0 1-3 1.3c-1.4-.3-1.8-1.7-2-2.7a2 2 0 0 0-1.9-1.7 2 2 0 0 0-2 2.4c.6 3 2.4 5.7 5.5 6a8 8 0 0 0 5.4-1.8 8 8 0 0 0 5.4 1.8c3.3-.5 5-3.2 5.5-6a2 2 0 0 0-2-2.4 2 2 0 0 0-1.9 1.7 3 3 0 0 1-2 2.7 5.3 5.3 0 0 1-3-1.3v-4.6a1.8 1.8 0 0 0 1-1.5c0-1.1-1.4-2-3-2z"/></svg>

<pre>svg .cat {
  animation: spin 5s linear infinite;
  transform-origin: 50% 50%;
  <strong>transform-box: fill-box;</strong>
}</pre>

<svg width="465" viewBox="0 0 300 74"><path class="cat origin" d="M19.1 0a3 3 0 0 0-2.3 1.5C9.8 13.5 4.4 26 4.3 41.3a16.4 16.4 0 0 0-4.3.8L.6 44a15.6 15.6 0 0 1 3.7-.7 31 31 0 0 0 .4 4l-1.9.8 1 1.8 1.3-.6.6 2.1a19.5 19.5 0 0 0-2.1 2L5 54.6l1.4-1.3A33.3 33.3 0 0 0 37 74h12c13.7 0 26.1-8.3 30.8-20.4l1.3 1.1 1.4-1.4a22 22 0 0 0-2-1.8l.6-2.2 1.2.6.8-1.8c-.4-.2-1-.6-1.7-.8a31.7 31.7 0 0 0 .3-4 15.2 15.2 0 0 1 3.7.7l.6-2a16.6 16.6 0 0 0-4.3-.7C81.3 25.5 75 15.1 69.3 3.7a3 3 0 0 0-5.2-.1L59 12.8a123.2 123.2 0 0 0-31-1L21.9 1.6A3 3 0 0 0 19.1 0zm3 13.7l1.7 2.8a3 3 0 0 0 2.3 1.5c-.2 4.7 1.4 12.1 6 12 4-.1 5.7-4.2 6.4-7.5.6 2.9 2.7 5.4 5.5 5.5 3.9 0 5.3-3 6.1-6 .2 3.6 1.8 8 5.9 8 5.8 0 6.6-7.3 6.8-12a29 29 0 0 0 2.2-3.8 10.3 10.3 0 0 0-.2 1.8 3 3 0 0 0 1.7 2.7 9.8 9.8 0 0 0 4.1 1.1 54.7 54.7 0 0 1 5.1 21.8l-2.2.4.5 2c.6-.1 1.1-.3 1.7-.3l-.1 2.2a15 15 0 0 0-2 .2l.3 2a10.6 10.6 0 0 1 1.3-.2c0 .5-.2.9-.3 1.3l-1-.2-.3 2 .7.1A26.7 26.7 0 0 1 49 68H37a27.3 27.3 0 0 1-25.1-17h.4l-.2-2-.9.1L11 48l1.1.1.3-2a14.9 14.9 0 0 0-1.8-.1l-.2-2.3 1.6.3.6-1.9a22.5 22.5 0 0 0-2.3-.4 61.4 61.4 0 0 1 5.1-23.8 9 9 0 0 0 5.2-1.1 3.5 3.5 0 0 0 1.6-3zm3 16.3c-1 0-2 1.8-2 4s1 4 2 4 2-1.8 2-4-.9-4-2-4zM61 30c-1.1 0-2 1.8-2 4s.9 4 2 4 2-1.8 2-4-.9-4-2-4zM43 41c-1.6 0-3 .9-3 2a1.8 1.8 0 0 0 1 1.5v4.6a5.3 5.3 0 0 1-3 1.3c-1.4-.3-1.8-1.7-2-2.7a2 2 0 0 0-1.9-1.7 2 2 0 0 0-2 2.4c.6 3 2.4 5.7 5.5 6a8 8 0 0 0 5.4-1.8 8 8 0 0 0 5.4 1.8c3.3-.5 5-3.2 5.5-6a2 2 0 0 0-2-2.4 2 2 0 0 0-1.9 1.7 3 3 0 0 1-2 2.7 5.3 5.3 0 0 1-3-1.3v-4.6a1.8 1.8 0 0 0 1-1.5c0-1.1-1.4-2-3-2z"/></svg>

<p>Method for browsers that don't support transform-box:</p>

<pre>@keyframes spin-workaround {
  from {
    transform: translate(43px, 37px) rotate(0deg) translate(-43px, -37px);
  }
  to {
    transform: translate(43px, 37px) rotate(360deg) translate(-43px, -37px);
  }
}

.workaround {
  animation: spin-workaround 5s linear infinite;
  transform-origin: 0 0;
}</pre>

<svg width="465" viewBox="0 0 300 74"><path class="cat workaround" d="M19.1 0a3 3 0 0 0-2.3 1.5C9.8 13.5 4.4 26 4.3 41.3a16.4 16.4 0 0 0-4.3.8L.6 44a15.6 15.6 0 0 1 3.7-.7 31 31 0 0 0 .4 4l-1.9.8 1 1.8 1.3-.6.6 2.1a19.5 19.5 0 0 0-2.1 2L5 54.6l1.4-1.3A33.3 33.3 0 0 0 37 74h12c13.7 0 26.1-8.3 30.8-20.4l1.3 1.1 1.4-1.4a22 22 0 0 0-2-1.8l.6-2.2 1.2.6.8-1.8c-.4-.2-1-.6-1.7-.8a31.7 31.7 0 0 0 .3-4 15.2 15.2 0 0 1 3.7.7l.6-2a16.6 16.6 0 0 0-4.3-.7C81.3 25.5 75 15.1 69.3 3.7a3 3 0 0 0-5.2-.1L59 12.8a123.2 123.2 0 0 0-31-1L21.9 1.6A3 3 0 0 0 19.1 0zm3 13.7l1.7 2.8a3 3 0 0 0 2.3 1.5c-.2 4.7 1.4 12.1 6 12 4-.1 5.7-4.2 6.4-7.5.6 2.9 2.7 5.4 5.5 5.5 3.9 0 5.3-3 6.1-6 .2 3.6 1.8 8 5.9 8 5.8 0 6.6-7.3 6.8-12a29 29 0 0 0 2.2-3.8 10.3 10.3 0 0 0-.2 1.8 3 3 0 0 0 1.7 2.7 9.8 9.8 0 0 0 4.1 1.1 54.7 54.7 0 0 1 5.1 21.8l-2.2.4.5 2c.6-.1 1.1-.3 1.7-.3l-.1 2.2a15 15 0 0 0-2 .2l.3 2a10.6 10.6 0 0 1 1.3-.2c0 .5-.2.9-.3 1.3l-1-.2-.3 2 .7.1A26.7 26.7 0 0 1 49 68H37a27.3 27.3 0 0 1-25.1-17h.4l-.2-2-.9.1L11 48l1.1.1.3-2a14.9 14.9 0 0 0-1.8-.1l-.2-2.3 1.6.3.6-1.9a22.5 22.5 0 0 0-2.3-.4 61.4 61.4 0 0 1 5.1-23.8 9 9 0 0 0 5.2-1.1 3.5 3.5 0 0 0 1.6-3zm3 16.3c-1 0-2 1.8-2 4s1 4 2 4 2-1.8 2-4-.9-4-2-4zM61 30c-1.1 0-2 1.8-2 4s.9 4 2 4 2-1.8 2-4-.9-4-2-4zM43 41c-1.6 0-3 .9-3 2a1.8 1.8 0 0 0 1 1.5v4.6a5.3 5.3 0 0 1-3 1.3c-1.4-.3-1.8-1.7-2-2.7a2 2 0 0 0-1.9-1.7 2 2 0 0 0-2 2.4c.6 3 2.4 5.7 5.5 6a8 8 0 0 0 5.4-1.8 8 8 0 0 0 5.4 1.8c3.3-.5 5-3.2 5.5-6a2 2 0 0 0-2-2.4 2 2 0 0 0-1.9 1.7 3 3 0 0 1-2 2.7 5.3 5.3 0 0 1-3-1.3v-4.6a1.8 1.8 0 0 0 1-1.5c0-1.1-1.4-2-3-2z"/></svg>

<p>Or use SVG within SVG:</p>


<svg width="465" viewBox="0 0 300 74"><svg width="86" height="74"><path class="cat workaround2" d="M19.1 0a3 3 0 0 0-2.3 1.5C9.8 13.5 4.4 26 4.3 41.3a16.4 16.4 0 0 0-4.3.8L.6 44a15.6 15.6 0 0 1 3.7-.7 31 31 0 0 0 .4 4l-1.9.8 1 1.8 1.3-.6.6 2.1a19.5 19.5 0 0 0-2.1 2L5 54.6l1.4-1.3A33.3 33.3 0 0 0 37 74h12c13.7 0 26.1-8.3 30.8-20.4l1.3 1.1 1.4-1.4a22 22 0 0 0-2-1.8l.6-2.2 1.2.6.8-1.8c-.4-.2-1-.6-1.7-.8a31.7 31.7 0 0 0 .3-4 15.2 15.2 0 0 1 3.7.7l.6-2a16.6 16.6 0 0 0-4.3-.7C81.3 25.5 75 15.1 69.3 3.7a3 3 0 0 0-5.2-.1L59 12.8a123.2 123.2 0 0 0-31-1L21.9 1.6A3 3 0 0 0 19.1 0zm3 13.7l1.7 2.8a3 3 0 0 0 2.3 1.5c-.2 4.7 1.4 12.1 6 12 4-.1 5.7-4.2 6.4-7.5.6 2.9 2.7 5.4 5.5 5.5 3.9 0 5.3-3 6.1-6 .2 3.6 1.8 8 5.9 8 5.8 0 6.6-7.3 6.8-12a29 29 0 0 0 2.2-3.8 10.3 10.3 0 0 0-.2 1.8 3 3 0 0 0 1.7 2.7 9.8 9.8 0 0 0 4.1 1.1 54.7 54.7 0 0 1 5.1 21.8l-2.2.4.5 2c.6-.1 1.1-.3 1.7-.3l-.1 2.2a15 15 0 0 0-2 .2l.3 2a10.6 10.6 0 0 1 1.3-.2c0 .5-.2.9-.3 1.3l-1-.2-.3 2 .7.1A26.7 26.7 0 0 1 49 68H37a27.3 27.3 0 0 1-25.1-17h.4l-.2-2-.9.1L11 48l1.1.1.3-2a14.9 14.9 0 0 0-1.8-.1l-.2-2.3 1.6.3.6-1.9a22.5 22.5 0 0 0-2.3-.4 61.4 61.4 0 0 1 5.1-23.8 9 9 0 0 0 5.2-1.1 3.5 3.5 0 0 0 1.6-3zm3 16.3c-1 0-2 1.8-2 4s1 4 2 4 2-1.8 2-4-.9-4-2-4zM61 30c-1.1 0-2 1.8-2 4s.9 4 2 4 2-1.8 2-4-.9-4-2-4zM43 41c-1.6 0-3 .9-3 2a1.8 1.8 0 0 0 1 1.5v4.6a5.3 5.3 0 0 1-3 1.3c-1.4-.3-1.8-1.7-2-2.7a2 2 0 0 0-1.9-1.7 2 2 0 0 0-2 2.4c.6 3 2.4 5.7 5.5 6a8 8 0 0 0 5.4-1.8 8 8 0 0 0 5.4 1.8c3.3-.5 5-3.2 5.5-6a2 2 0 0 0-2-2.4 2 2 0 0 0-1.9 1.7 3 3 0 0 1-2 2.7 5.3 5.3 0 0 1-3-1.3v-4.6a1.8 1.8 0 0 0 1-1.5c0-1.1-1.4-2-3-2z"/></svg></svg>
              
            
!

CSS

              
                .cat {
  animation: spin 5s linear infinite;
  transform-origin: 50% 50%;
}

.origin {
  transform-box: fill-box;
}

.workaround {
  animation: spin-workaround 5s linear infinite;
  transform-origin: 0 0;
}

.workaround2 {
  transform-origin: 43 37;
}


html {
  font-family: sans-serif;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

pre {
  font-size: 1.7rem;
}

svg {
  background: #ddd;
}

@keyframes spin-workaround {
  from {
    transform: translate(43px, 37px) rotate(0deg) translate(-43px, -37px);
  }
  to {
    transform: translate(43px, 37px) rotate(360deg) translate(-43px, -37px);
  }
}


              
            
!

JS

              
                
              
            
!
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