This is a testharness.js-based test.
[FAIL] e.style['overflow-clip-margin'] = "calc(100px - 50px)" should set the property value
  assert_not_equals: property should be set got disallowed value ""
[FAIL] e.style['overflow-clip-margin'] = "calc(100px - 100px)" should set the property value
  assert_not_equals: property should be set got disallowed value ""
[FAIL] e.style['overflow-clip-margin'] = "calc(0.5em - 100px)" should set the property value
  assert_not_equals: property should be set got disallowed value ""
Harness: the test ran to completion.