| <!DOCTYPE html> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="support/helper.sub.js"></script> |
| |
| <meta http-equiv="Content-Security-Policy" content="trusted-types *"> |
| <body> |
| <script> |
| test(t => { |
| const empty = TrustedTypes.emptyHTML; |
| assert_true(TrustedTypes.isHTML(empty)); |
| assert_equals(empty.toString(), ""); |
| }, 'TrustedTypes.emptyHTML returns the intended value.'); |
| |
| test(t => { |
| try { TrustedTypes.emptyHTML = 'fake'; } catch { } |
| assert_true(TrustedTypes.isHTML(TrustedTypes.emptyHTML)); |
| assert_equals(TrustedTypes.emptyHTML.toString(), ""); |
| }, 'TrustedTypes.emptyHTML cannot be redefined.'); |
| |
| test(t => { |
| try { Object.defineProperty(TrustedTypes, 'emptyHTML', 'fake'); } catch { } |
| assert_true(TrustedTypes.isHTML(TrustedTypes.emptyHTML)); |
| assert_equals(TrustedTypes.emptyHTML.toString(), ""); |
| }, 'TrustedTypes.emptyHTML cannot be redefined via defineProperty.'); |
| </script> |
