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Test Info:

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
<script>
test_valid_value('baseline-source', 'auto');
test_valid_value('baseline-source', 'first');
test_valid_value('baseline-source', 'last');
</script>