This is a testharness.js-based test.
[FAIL] Can set 'animation-name' to the 'custom-ident' keyword: custom-ident
Failed to execute 'set' on 'StylePropertyMap': Invalid type for property
[FAIL] 'animation-name' does not support '"foo"'
assert_not_equals: Unsupported value must not be null got disallowed value null
Harness: the test ran to completion.