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chromium/third_party/blink/web_tests/animations/responsive/interpolation/line-height-responsive.html 

<!DOCTYPE html>
<style>
.target {
  font-size: 4px;
}
</style>
<script src="resources/responsive-test.js"></script>
<script>
assertCSSResponsive({
  property: 'line-height',
  from: 'inherit',
  to: '200px',
  configurations: [{
    state: {inherited: '100px'},
    expect: [
      {at: 0.25, is: '125px'},
      {at: 0.75, is: '175px'},
    ],
  }, {
    state: {inherited: '10'},
    expect: [
      {at: 0.25, is: '40px'},
      {at: 0.75, is: '200px'},
    ],
  }],
});

assertCSSResponsive({
  property: 'line-height',
  from: neutralKeyframe,
  to: '200px',
  configurations: [{
    state: {underlying: '10'},
    expect: [
      {at: 0.25, is: '40px'},
      {at: 0.75, is: '200px'},
    ],
  }, {
    state: {underlying: '100px'},
    expect: [
      {at: 0.25, is: '125px'},
      {at: 0.75, is: '175px'},
    ],
  }, {
    state: {underlying: 'normal'},
    expect: [
      {at: 0.25, is: 'normal'},
      {at: 0.75, is: '200px'},
    ],
  }, {
    state: {underlying: 'inherit', inherited: '10'},
    expect: [
      {at: 0.25, is: '40px'},
      {at: 0.75, is: '200px'},
    ],
  }, {
    state: {underlying: 'inherit', inherited: '100px'},
    expect: [
      {at: 0.25, is: '125px'},
      {at: 0.75, is: '175px'},
    ],
  }, {
    state: {underlying: 'inherit', inherited: 'normal'},
    expect: [
      {at: 0.25, is: 'normal'},
      {at: 0.75, is: '200px'},
    ],
  }],
});

assertCSSResponsive({
  property: 'line-height',
  from: neutralKeyframe,
  to: '20',
  configurations: [{
    state: {underlying: '10'},
    expect: [
      {at: 0.25, is: '50px'},
      {at: 0.75, is: '70px'},
    ],
  }, {
    state: {underlying: '100px'},
    expect: [
      {at: 0.25, is: '100px'},
      {at: 0.75, is: '80px'},
    ],
  }, {
    state: {underlying: 'normal'},
    expect: [
      {at: 0.25, is: 'normal'},
      {at: 0.75, is: '80px'},
    ],
  }, {
    state: {underlying: 'inherit', inherited: '10'},
    expect: [
      {at: 0.25, is: '50px'},
      {at: 0.75, is: '70px'},
    ],
  }, {
    state: {underlying: 'inherit', inherited: '100px'},
    expect: [
      {at: 0.25, is: '100px'},
      {at: 0.75, is: '80px'},
    ],
  }, {
    state: {underlying: 'inherit', inherited: 'normal'},
    expect: [
      {at: 0.25, is: 'normal'},
      {at: 0.75, is: '80px'},
    ],
  }],
});
</script>