diff --git a/css/css-transitions/all-with-discrete.tentative.html b/css/css-transitions/all-with-discrete.tentative.html
new file mode 100644
index 000000000000000..f12c14e4c55285f
--- /dev/null
+++ b/css/css-transitions/all-with-discrete.tentative.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<link rel=author href="mailto:jarhar@chromium.org">
+<link rel=help href="https://github.com/w3c/csswg-drafts/issues/4441">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<div id=target1 class=target>hello</div>
+<div id=target2 class=target>hello</div>
+
+<style>
+.target {
+  float: left;
+  width: 100px;
+  height: 100px;
+}
+.target.animated {
+  float: right;
+}
+
+#target1 {
+  transition: all 1s, float 1s;
+}
+
+#target2 {
+  transition: all 1s;
+}
+</style>
+
+<script>
+promise_test(async () => {
+  let transitionstartFired = false;
+  target1.addEventListener('transitionstart', () => {
+    transitionstartFired = true;
+  });
+  await new Promise(resolve => requestAnimationFrame(resolve));
+  target1.classList.add('animated');
+  await new Promise(resolve => requestAnimationFrame(resolve));
+  assert_true(transitionstartFired);
+}, 'all with an explicit discrete property should animate.');
+
+promise_test(async () => {
+  let transitionstartFired = false;
+  target2.addEventListener('transitionstart', () => {
+    transitionstartFired = true;
+  });
+  await new Promise(resolve => requestAnimationFrame(resolve));
+  target2.classList.add('animated');
+  await new Promise(resolve => requestAnimationFrame(resolve));
+  assert_false(transitionstartFired);
+}, 'all without an explicit discrete property should not animate.');
+</script>
diff --git a/css/css-transitions/discrete-no-interpolation.tentative.html b/css/css-transitions/discrete-no-interpolation.tentative.html
new file mode 100644
index 000000000000000..1dcb95581d99b9f
--- /dev/null
+++ b/css/css-transitions/discrete-no-interpolation.tentative.html
@@ -0,0 +1,911 @@
+<!DOCTYPE html>
+<meta name=timeout content=long>
+<link rel=author href="mailto:jarhar@chromium.org">
+<link rel=help href="https://github.com/w3c/csswg-drafts/issues/4441">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/css/support/interpolation-testcommon.js"></script>
+
+<body>
+<script>
+  test_no_interpolation({
+    property: 'align-content',
+    from: 'initial',
+    to: 'baseline'
+  });
+
+  test_no_interpolation({
+    property: 'align-items',
+    from: 'initial',
+    to: 'baseline'
+  });
+
+  test_no_interpolation({
+    property: 'align-self',
+    from: 'initial',
+    to: 'baseline'
+  });
+
+  test_no_interpolation({
+    property: 'alignment-baseline',
+    from: 'initial',
+    to: 'central'
+  });
+
+  test_no_interpolation({
+    property: 'anchor-name',
+    from: 'initial',
+    to: '--a1'
+  });
+
+  test_no_interpolation({
+    property: 'anchor-scroll',
+    from: 'initial',
+    to: '--a1'
+  });
+
+  test_no_interpolation({
+    property: 'appearance',
+    from: 'initial',
+    to: 'none'
+  });
+
+  test_no_interpolation({
+    property: 'app-region',
+    from: 'initial',
+    to: 'drag'
+  });
+
+  test_no_interpolation({
+    property: 'backface-visibility',
+    from: 'initial',
+    to: 'hidden'
+  });
+
+  test_no_interpolation({
+    property: 'background-attachment',
+    from: 'initial',
+    to: 'fixed'
+  });
+
+  test_no_interpolation({
+    property: 'background-blend-mode',
+    from: 'initial',
+    to: 'overlay'
+  });
+
+  test_no_interpolation({
+    property: 'background-clip',
+    from: 'initial',
+    to: 'content-box'
+  });
+
+  test_no_interpolation({
+    property: 'background-origin',
+    from: 'initial',
+    to: 'border-box'
+  });
+
+  test_no_interpolation({
+    property: 'background-repeat',
+    from: 'initial',
+    to: 'round'
+  });
+
+  test_no_interpolation({
+    property: 'baseline-source',
+    from: 'initial',
+    to: 'last'
+  });
+
+  test_no_interpolation({
+    property: 'border-bottom-style',
+    from: 'initial',
+    to: 'dotted'
+  });
+
+  test_no_interpolation({
+    property: 'border-collapse',
+    from: 'initial',
+    to: 'collapse'
+  });
+
+  test_no_interpolation({
+    property: 'border-image-repeat',
+    from: 'initial',
+    to: 'round'
+  });
+
+  test_no_interpolation({
+    property: 'border-left-style',
+    from: 'initial',
+    to: 'dotted'
+  });
+
+  test_no_interpolation({
+    property: 'border-right-style',
+    from: 'initial',
+    to: 'dotted'
+  });
+
+  test_no_interpolation({
+    property: 'border-top-style',
+    from: 'initial',
+    to: 'dotted'
+  });
+
+  test_no_interpolation({
+    property: 'box-sizing',
+    from: 'initial',
+    to: 'border-box'
+  });
+
+  test_no_interpolation({
+    property: 'break-after',
+    from: 'initial',
+    to: 'avoid'
+  });
+
+  test_no_interpolation({
+    property: 'break-before',
+    from: 'initial',
+    to: 'avoid'
+  });
+
+  test_no_interpolation({
+    property: 'break-inside',
+    from: 'initial',
+    to: 'avoid'
+  });
+
+  test_no_interpolation({
+    property: 'buffered-rendering',
+    from: 'initial',
+    to: 'static'
+  });
+
+  test_no_interpolation({
+    property: 'caption-side',
+    from: 'initial',
+    to: 'bottom'
+  });
+
+  test_no_interpolation({
+    property: 'clear',
+    from: 'initial',
+    to: 'both'
+  });
+
+  test_no_interpolation({
+    property: 'clip-rule',
+    from: 'initial',
+    to: 'evenodd'
+  });
+
+  test_no_interpolation({
+    property: 'color-interpolation',
+    from: 'initial',
+    to: 'auto'
+  });
+
+  test_no_interpolation({
+    property: 'color-interpolation-filters',
+    from: 'initial',
+    to: 'auto'
+  });
+
+  test_no_interpolation({
+    property: 'color-rendering',
+    from: 'initial',
+    to: 'optimizespeed'
+  });
+
+  test_no_interpolation({
+    property: 'color-scheme',
+    from: 'initial',
+    to: 'dark'
+  });
+
+  test_no_interpolation({
+    property: 'column-fill',
+    from: 'initial',
+    to: 'auto'
+  });
+
+  test_no_interpolation({
+    property: 'column-rule-style',
+    from: 'initial',
+    to: 'dashed'
+  });
+
+  test_no_interpolation({
+    property: 'column-span',
+    from: 'initial',
+    to: 'all'
+  });
+
+  test_no_interpolation({
+    property: 'content',
+    from: 'initial',
+    to: '"b"'
+  });
+
+  test_no_interpolation({
+    property: 'counter-increment',
+    from: 'initial',
+    to: 'add 123'
+  });
+
+  test_no_interpolation({
+    property: 'counter-reset',
+    from: 'initial',
+    to: 'add 123'
+  });
+
+  test_no_interpolation({
+    property: 'counter-set',
+    from: 'initial',
+    to: 'add 123'
+  });
+
+  test_no_interpolation({
+    property: 'cursor',
+    from: 'initial',
+    to: 'none'
+  });
+
+  test_no_interpolation({
+    property: 'display',
+    from: 'initial',
+    to: 'flow-root'
+  });
+
+  test_no_interpolation({
+    property: 'dominant-baseline',
+    from: 'initial',
+    to: 'middle'
+  });
+
+  test_no_interpolation({
+    property: 'empty-cells',
+    from: 'initial',
+    to: 'hide'
+  });
+
+  test_no_interpolation({
+    property: 'fill-rule',
+    from: 'initial',
+    to: 'evenodd'
+  });
+
+  test_no_interpolation({
+    property: 'flex-direction',
+    from: 'initial',
+    to: 'column'
+  });
+
+  test_no_interpolation({
+    property: 'flex-wrap',
+    from: 'initial',
+    to: 'wrap'
+  });
+
+  test_no_interpolation({
+    property: 'float',
+    from: 'initial',
+    to: 'right'
+  });
+
+  test_no_interpolation({
+    property: 'font-family',
+    from: 'initial',
+    to: 'c'
+  });
+
+  test_no_interpolation({
+    property: 'font-kerning',
+    from: 'initial',
+    to: 'none'
+  });
+
+  test_no_interpolation({
+    property: 'font-optical-sizing',
+    from: 'initial',
+    to: 'none'
+  });
+
+  test_no_interpolation({
+    property: 'font-palette',
+    from: 'initial',
+    to: 'dark'
+  });
+
+  test_no_interpolation({
+    property: 'font-feature-settings',
+    from: 'initial',
+    to: '"smcp"'
+  });
+
+  test_no_interpolation({
+    property: 'font-synthesis-small-caps',
+    from: 'initial',
+    to: 'none'
+  });
+
+  test_no_interpolation({
+    property: 'font-synthesis-style',
+    from: 'initial',
+    to: 'none'
+  });
+
+  test_no_interpolation({
+    property: 'font-synthesis-weight',
+    from: 'initial',
+    to: 'none'
+  });
+
+  test_no_interpolation({
+    property: 'font-variant-alternates',
+    from: 'initial',
+    to: 'historical-forms'
+  });
+
+  test_no_interpolation({
+    property: 'font-variant-caps',
+    from: 'initial',
+    to: 'small-caps'
+  });
+
+  test_no_interpolation({
+    property: 'font-variant-east-asian',
+    from: 'initial',
+    to: 'full-width'
+  });
+
+  test_no_interpolation({
+    property: 'font-variant-numeric',
+    from: 'initial',
+    to: 'tabular-nums'
+  });
+
+  test_no_interpolation({
+    property: 'font-variant-position',
+    from: 'initial',
+    to: 'super'
+  });
+
+  test_no_interpolation({
+    property: 'forced-color-adjust',
+    from: 'initial',
+    to: 'none'
+  });
+
+  test_no_interpolation({
+    property: 'grid-auto-columns',
+    from: 'initial',
+    to: '123px'
+  });
+
+  test_no_interpolation({
+    property: 'grid-auto-flow',
+    from: 'initial',
+    to: 'column'
+  });
+
+  test_no_interpolation({
+    property: 'grid-auto-rows',
+    from: 'initial',
+    to: '123px'
+  });
+
+  test_no_interpolation({
+    property: 'grid-column-end',
+    from: 'initial',
+    to: '123'
+  });
+
+  test_no_interpolation({
+    property: 'grid-column-start',
+    from: 'initial',
+    to: '123'
+  });
+
+  test_no_interpolation({
+    property: 'grid-row-end',
+    from: 'initial',
+    to: '123'
+  });
+
+  test_no_interpolation({
+    property: 'grid-row-start',
+    from: 'initial',
+    to: '123'
+  });
+
+  test_no_interpolation({
+    property: 'grid-template-areas',
+    from: 'initial',
+    to: '"."'
+  });
+
+  // height is interpolable, but height:auto is not.
+  test_no_interpolation({
+    property: 'height',
+    from: '0px',
+    to: 'auto'
+  });
+
+  test_no_interpolation({
+    property: 'hyphenate-character',
+    from: 'initial',
+    to: '"e"'
+  });
+
+  test_no_interpolation({
+    property: 'hyphenate-limit-chars',
+    from: 'initial',
+    to: '10'
+  });
+
+  test_no_interpolation({
+    property: 'hyphens',
+    from: 'initial',
+    to: 'auto'
+  });
+
+  test_no_interpolation({
+    property: 'image-orientation',
+    from: 'initial',
+    to: 'none'
+  });
+
+  test_no_interpolation({
+    property: 'image-rendering',
+    from: 'initial',
+    to: 'pixelated'
+  });
+
+  test_no_interpolation({
+    property: 'initial-letter',
+    from: 'initial',
+    to: '123'
+  });
+
+  test_no_interpolation({
+    property: 'isolation',
+    from: 'initial',
+    to: 'isolate'
+  });
+
+  test_no_interpolation({
+    property: 'justify-content',
+    from: 'initial',
+    to: 'center'
+  });
+
+  test_no_interpolation({
+    property: 'justify-items',
+    from: 'initial',
+    to: 'baseline'
+  });
+
+  test_no_interpolation({
+    property: 'justify-self',
+    from: 'initial',
+    to: 'baseline'
+  });
+
+  test_no_interpolation({
+    property: 'line-break',
+    from: 'initial',
+    to: 'anywhere'
+  });
+
+  test_no_interpolation({
+    property: 'list-style-position',
+    from: 'initial',
+    to: 'inside'
+  });
+
+  test_no_interpolation({
+    property: 'list-style-type',
+    from: 'initial',
+    to: 'square'
+  });
+
+  test_no_interpolation({
+    property: 'marker-end',
+    from: 'initial',
+    to: 'url("#ref")'
+  });
+
+  test_no_interpolation({
+    property: 'marker-mid',
+    from: 'initial',
+    to: 'url("#ref")'
+  });
+
+  test_no_interpolation({
+    property: 'marker-start',
+    from: 'initial',
+    to: 'url("#ref")'
+  });
+
+  test_no_interpolation({
+    property: 'mask-type',
+    from: 'initial',
+    to: 'alpha'
+  });
+
+  test_no_interpolation({
+    property: 'math-shift',
+    from: 'initial',
+    to: 'compact'
+  });
+
+  test_no_interpolation({
+    property: 'math-style',
+    from: 'initial',
+    to: 'compact'
+  });
+
+  test_no_interpolation({
+    property: 'mix-blend-mode',
+    from: 'initial',
+    to: 'overlay'
+  });
+
+  test_no_interpolation({
+    property: 'object-fit',
+    from: 'initial',
+    to: 'contain'
+  });
+
+  test_no_interpolation({
+    property: 'outline-style',
+    from: 'initial',
+    to: 'auto'
+  });
+
+  test_no_interpolation({
+    property: 'overflow-anchor',
+    from: 'initial',
+    to: 'none'
+  });
+
+  test_no_interpolation({
+    property: 'overflow-clip-margin',
+    from: 'initial',
+    to: '123px'
+  });
+
+  test_no_interpolation({
+    property: 'overflow-wrap',
+    from: 'initial',
+    to: 'anywhere'
+  });
+
+  test_no_interpolation({
+    property: 'overflow-x',
+    from: 'initial',
+    to: 'auto'
+  });
+
+  test_no_interpolation({
+    property: 'overflow-y',
+    from: 'initial',
+    to: 'hidden'
+  });
+
+  test_no_interpolation({
+    property: 'overscroll-behavior-x',
+    from: 'initial',
+    to: 'contain'
+  });
+
+  test_no_interpolation({
+    property: 'overscroll-behavior-y',
+    from: 'initial',
+    to: 'contain'
+  });
+
+  test_no_interpolation({
+    property: 'paint-order',
+    from: 'initial',
+    to: 'fill'
+  });
+
+  test_no_interpolation({
+    property: 'pointer-events',
+    from: 'initial',
+    to: 'none'
+  });
+
+  test_no_interpolation({
+    property: 'position',
+    from: 'initial',
+    to: 'relative'
+  });
+
+  test_no_interpolation({
+    property: 'position-fallback',
+    from: 'initial',
+    to: '--pf'
+  });
+
+  test_no_interpolation({
+    property: 'quotes',
+    from: 'initial',
+    to: 'none'
+  });
+
+  test_no_interpolation({
+    property: 'resize',
+    from: 'initial',
+    to: 'both'
+  });
+
+  test_no_interpolation({
+    property: 'ruby-position',
+    from: 'initial',
+    to: 'under'
+  });
+
+  test_no_interpolation({
+    property: 'scrollbar-gutter',
+    from: 'initial',
+    to: 'stable'
+  });
+
+  test_no_interpolation({
+    property: 'scrollbar-width',
+    from: 'initial',
+    to: 'none'
+  });
+
+  test_no_interpolation({
+    property: 'scroll-behavior',
+    from: 'initial',
+    to: 'smooth'
+  });
+
+  test_no_interpolation({
+    property: 'scroll-margin-bottom',
+    from: 'initial',
+    to: '123px'
+  });
+
+  test_no_interpolation({
+    property: 'scroll-margin-left',
+    from: 'initial',
+    to: '123px'
+  });
+
+  test_no_interpolation({
+    property: 'scroll-margin-right',
+    from: 'initial',
+    to: '123px'
+  });
+
+  test_no_interpolation({
+    property: 'scroll-margin-top',
+    from: 'initial',
+    to: '123px'
+  });
+
+  test_no_interpolation({
+    property: 'scroll-padding-bottom',
+    from: 'initial',
+    to: '123px'
+  });
+
+  test_no_interpolation({
+    property: 'scroll-padding-left',
+    from: 'initial',
+    to: '123px'
+  });
+
+  test_no_interpolation({
+    property: 'scroll-padding-right',
+    from: 'initial',
+    to: '123px'
+  });
+
+  test_no_interpolation({
+    property: 'scroll-padding-top',
+    from: 'initial',
+    to: '123px'
+  });
+
+  test_no_interpolation({
+    property: 'scroll-snap-align',
+    from: 'initial',
+    to: 'center'
+  });
+
+  test_no_interpolation({
+    property: 'scroll-snap-type',
+    from: 'initial',
+    to: 'both'
+  });
+
+  test_no_interpolation({
+    property: 'shape-rendering',
+    from: 'initial',
+    to: 'optimizespeed'
+  });
+
+  test_no_interpolation({
+    property: 'size-adjust',
+    from: 'initial',
+    to: '90%'
+  });
+
+  test_no_interpolation({
+    property: 'speak',
+    from: 'initial',
+    to: 'spell-out'
+  });
+
+  test_no_interpolation({
+    property: 'stroke-linecap',
+    from: 'initial',
+    to: 'round'
+  });
+
+  test_no_interpolation({
+    property: 'stroke-linejoin',
+    from: 'initial',
+    to: 'round'
+  });
+
+  test_no_interpolation({
+    property: 'table-layout',
+    from: 'initial',
+    to: 'fixed'
+  });
+
+  test_no_interpolation({
+    property: 'text-align',
+    from: 'initial',
+    to: 'center'
+  });
+
+  test_no_interpolation({
+    property: 'text-align-last',
+    from: 'initial',
+    to: 'center'
+  });
+
+  test_no_interpolation({
+    property: 'text-anchor',
+    from: 'initial',
+    to: 'middle'
+  });
+
+  test_no_interpolation({
+    property: 'text-decoration-line',
+    from: 'initial',
+    to: 'underline'
+  });
+
+  test_no_interpolation({
+    property: 'text-decoration-style',
+    from: 'initial',
+    to: 'dashed'
+  });
+
+  test_no_interpolation({
+    property: 'text-decoration-thickness',
+    from: 'initial',
+    to: '123px'
+  });
+
+  test_no_interpolation({
+    property: 'text-emphasis-position',
+    from: 'initial',
+    to: 'under right'
+  });
+
+  test_no_interpolation({
+    property: 'text-emphasis-style',
+    from: 'initial',
+    to: 'dot'
+  });
+
+  test_no_interpolation({
+    property: 'text-overflow',
+    from: 'initial',
+    to: 'ellipsis'
+  });
+
+  test_no_interpolation({
+    property: 'text-rendering',
+    from: 'initial',
+    to: 'optimizespeed'
+  });
+
+  test_no_interpolation({
+    property: 'text-transform',
+    from: 'initial',
+    to: 'lowercase'
+  });
+
+  test_no_interpolation({
+    property: 'text-underline-position',
+    from: 'initial',
+    to: 'under'
+  });
+
+  test_no_interpolation({
+    property: 'text-wrap',
+    from: 'initial',
+    to: 'pretty'
+  });
+
+  test_no_interpolation({
+    property: 'toggle-visibility',
+    from: 'initial',
+    to: 'toggle t'
+  });
+
+  test_no_interpolation({
+    property: 'top-layer',
+    from: 'initial',
+    to: 'browser'
+  });
+
+  test_no_interpolation({
+    property: 'touch-action',
+    from: 'initial',
+    to: 'none'
+  });
+
+  test_no_interpolation({
+    property: 'transform-box',
+    from: 'initial',
+    to: 'fill-box'
+  });
+
+  test_no_interpolation({
+    property: 'transform-style',
+    from: 'initial',
+    to: 'preserve-3d'
+  });
+
+  test_no_interpolation({
+    property: 'user-select',
+    from: 'initial',
+    to: 'none'
+  });
+
+  test_no_interpolation({
+    property: 'vector-effect',
+    from: 'initial',
+    to: 'non-scaling-stroke'
+  });
+
+  test_no_interpolation({
+    property: 'view-transition-name',
+    from: 'initial',
+    to: 'target'
+  });
+
+  test_no_interpolation({
+    property: 'white-space',
+    from: 'initial',
+    to: 'nowrap'
+  });
+
+  test_no_interpolation({
+    property: 'word-break',
+    from: 'initial',
+    to: 'break-word'
+  });
+
+  test_no_interpolation({
+    property: 'zoom',
+    from: 'initial',
+    to: '123'
+  });
+</script>
diff --git a/css/css-transitions/display-none-no-animations.html b/css/css-transitions/display-none-no-animations.html
new file mode 100644
index 000000000000000..32535baf9c7b1a2
--- /dev/null
+++ b/css/css-transitions/display-none-no-animations.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<link rel=help href="mailto:jarhar@chromium.org">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<div id=target>target</div>
+<style>
+#target {
+  display: none;
+  transition: 1s;
+  color: red;
+}
+#target.animated {
+  transition: 1s;
+  color: green;
+}
+</style>
+
+<script>
+test(() => {
+  target.addEventListener('transitionstart', () => {
+    assert_unreached('transitionstart should not be fired.');
+  });
+  target.classList.add('animated');
+  assert_equals(target.getAnimations().length, 0,
+    'There should not be any animations running.');
+}, 'Transitions and animations should not occur on display:none elements.');
+</script>
diff --git a/css/motion/animation/offset-interpolation.html b/css/motion/animation/offset-interpolation.html
index 2ee011bd77a975e..9c3747185dc8305 100644
--- a/css/motion/animation/offset-interpolation.html
+++ b/css/motion/animation/offset-interpolation.html
@@ -15,9 +15,9 @@
         to: 'path("M0 300H 700 Z") 600px 900deg',
         method: 'CSS Transitions',
       }, [
-        {at: -0.3, expect: 'path("M0 300H 700 Z") 470px 770deg'},
-        {at: 0, expect: 'path("M0 300H 700 Z") 500px 800deg'},
-        {at: 0.3, expect: 'path("M0 300H 700 Z") 530px 830deg'},
+        {at: -0.3, expect: 'path("M0 200H 700") 470px 770deg'},
+        {at: 0, expect: 'path("M0 200H 700") 500px 800deg'},
+        {at: 0.3, expect: 'path("M0 200H 700") 530px 830deg'},
         {at: 0.6, expect: 'path("M0 300H 700 Z") 560px 860deg'},
         {at: 1, expect: 'path("M0 300H 700 Z") 600px 900deg'},
         {at: 1.5, expect: 'path("M0 300H 700 Z") 650px 950deg'},
@@ -29,9 +29,9 @@
         to: 'path("M0 0H 300") 600px 0deg',
         method: 'CSS Transitions',
       }, [
-        {at: -0.3, expect: 'path("M0 0H 170") 470px 0deg'},
-        {at: 0, expect: 'path("M0 0H 200") 500px 0deg'},
-        {at: 0.3, expect: 'path("M0 0H 230") 530px 0deg'},
+        {at: -0.3, expect: 'path("M0 0H 170") 470px auto 0deg'},
+        {at: 0, expect: 'path("M0 0H 200") 500px auto 0deg'},
+        {at: 0.3, expect: 'path("M0 0H 230") 530px auto 0deg'},
         {at: 0.6, expect: 'path("M0 0H 260") 560px 0deg'},
         {at: 1, expect: 'path("M0 0H 300") 600px 0deg'},
         {at: 1.5, expect: 'path("M0 0H 350") 650px 0deg'},
diff --git a/css/support/interpolation-testcommon.js b/css/support/interpolation-testcommon.js
index aa8239ae928654b..283a2d8aaba8880 100644
--- a/css/support/interpolation-testcommon.js
+++ b/css/support/interpolation-testcommon.js
@@ -56,7 +56,7 @@
       target.style.setProperty(property, isNeutralKeyframe(from) ? '' : from);
     },
     nonInterpolationExpectations: function(from, to) {
-      return expectFlip(from, to, -Infinity);
+      return expectFlip(from, to, 0.5);
     },
     notAnimatableExpectations: function(from, to, underlying) {
       return expectFlip(from, to, -Infinity);
