This is a testharness.js-based test.
[FAIL] Range with font-relative units via direct typed CSSOM without range names
  assert_throws_js: function "() => {\n      target.animate({ width: "200px" }, options);\n    }" did not throw
[FAIL] Range with font-relative units via direct typed CSSOM using CSSMathSum with range names
  assert_throws_js: function "() => {\n      target.animate({ width: "200px" }, options);\n    }" did not throw
[FAIL] Range with invalid range name via dictionary
  assert_throws_js: function "() => {\n      target.animate({ width: "200px" }, options);\n    }" did not throw
[FAIL] Range with invalid range name with offset
  assert_throws_js: function "() => {\n      target.animate({ width: "200px" }, options);\n    }" did not throw
Harness: the test ran to completion.