chromium/third_party/blink/web_tests/external/wpt/web-animations/timing-model/animations/setting-the-start-time-of-an-animation-expected.txt

This is a testharness.js-based test.
[FAIL] Validate different value types that can be used to set start time
  assert_throws_js: function "() => {\n    animation.startTime = CSSNumericValue.parse("30%");\n  }" threw object "NotSupportedError: Failed to set the 'startTime' property on 'Animation': Invalid startTime. CSSNumericValue must be either a number or a time value for time based animations." ("NotSupportedError") expected instance of function "function TypeError() { [native code] }" ("TypeError")
Harness: the test ran to completion.