| <!doctype html> |
| <meta charset="utf-8"> |
| <title>CSSOM - Symbol.toStringTag value of CSS namespace object</title> |
| <link rel="help" href="https://heycam.github.io/webidl/#es-namespaces"> |
| <link rel="help" href="https://drafts.csswg.org/cssom/#namespacedef-css"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script> |
| "use strict"; |
| |
| test(() => { |
| assert_own_property(CSS, Symbol.toStringTag); |
| |
| const propDesc = Object.getOwnPropertyDescriptor(CSS, Symbol.toStringTag); |
| assert_equals(propDesc.value, "CSS", "value"); |
| assert_equals(propDesc.writable, false, "writable"); |
| assert_equals(propDesc.enumerable, false, "enumerable"); |
| assert_equals(propDesc.configurable, true, "configurable"); |
| }, "@@toStringTag exists on the namespace object with the appropriate descriptor"); |
| |
| test(() => { |
| assert_equals(CSS.toString(), "[object CSS]"); |
| assert_equals(Object.prototype.toString.call(CSS), "[object CSS]"); |
| }, "Object.prototype.toString applied to the namespace object"); |
| |
| test(t => { |
| assert_own_property(CSS, Symbol.toStringTag, "Precondition: @@toStringTag on the namespace object"); |
| t.add_cleanup(() => { |
| Object.defineProperty(CSS, Symbol.toStringTag, { value: "CSS" }); |
| }); |
| |
| Object.defineProperty(CSS, Symbol.toStringTag, { value: "Test" }); |
| assert_equals(CSS.toString(), "[object Test]"); |
| assert_equals(Object.prototype.toString.call(CSS), "[object Test]"); |
| }, "Object.prototype.toString applied after modifying the namespace object's @@toStringTag"); |
| |
| test(t => { |
| assert_own_property(CSS, Symbol.toStringTag, "Precondition: @@toStringTag on the namespace object"); |
| t.add_cleanup(() => { |
| Object.defineProperty(CSS, Symbol.toStringTag, { value: "CSS" }); |
| }); |
| |
| assert_true(delete CSS[Symbol.toStringTag]); |
| assert_equals(CSS.toString(), "[object Object]"); |
| assert_equals(Object.prototype.toString.call(CSS), "[object Object]"); |
| }, "Object.prototype.toString applied after deleting @@toStringTag"); |
| </script> |
