This is a testharness.js-based test.
[FAIL] negative rx presentation attribute computes to auto
  assert_equals: expected "auto" but got "-20px"
[FAIL] negative ry presentation attribute computes to auto
  assert_equals: expected "auto" but got "-20px"
[FAIL] negative r presentation attribute computes to 0px
  assert_equals: expected "0px" but got "-20px"
Harness: the test ran to completion.