This is a testharness.js-based test. [FAIL] new DOMException() has a stack property that is a string assert_equals: stack must be a string expected "string" but got "undefined" [FAIL] new DOMException() with no arguments has a stack property that is a string assert_equals: stack must be a string expected "string" but got "undefined" [FAIL] Error.prototype.stack is an accessor property with correct attributes assert_not_equals: Error.prototype must have a stack property descriptor got disallowed value undefined [FAIL] Error.prototype.stack getter works on DOMException instances Cannot read properties of undefined (reading 'get') [FAIL] Error.prototype.stack setter installs own data property on DOMException instances Cannot read properties of undefined (reading 'set') [FAIL] Error.prototype.stack setter ignores Error.prototype itself Cannot read properties of undefined (reading 'set') Harness: the test ran to completion.