This is a testharness.js-based test.
PASS Property break-inside value 'auto'
PASS Property break-inside value 'avoid'
PASS Property break-inside value 'avoid-page'
PASS Property break-inside value 'avoid-column'
FAIL Property break-inside value 'avoid-region' assert_true: 'avoid-region' is a supported value for break-inside. expected true got false
Harness: the test ran to completion.