ation-testcommon.js"></script>
<body>
  <template id="target-template">T</template>
</body>

<script>
test_interpolation({
  property: 'text-decoration-thickness',
  from: '16px',
  to: '0px',
}, [
  {at: 0, expect: '16px'},
  {at: 0.3, expect: '11.2px'},
  {at: 0.6, expect: '6.4px'},
  {at: 1, expect: '0px'},
]);

test_interpolation({
  property: 'text-decoration-thickness',
  from: '16px',
  to: '32px',
}, [
  {at: 0, expect: '16px'},
  {at: 0.3, expect: '20.8px'},
  {at: 0.6, expect: '25.6px'},
  {at: 1,