| <!DOCTYPE html> |
| <title>NoModificationAllowedError when mutating read only properties</title> |
| <link rel="help" href="https://www.w3.org/TR/cssom-1/#dom-cssstyledeclaration-setpropertyvalue"> |
| <meta name="assert" content="This test verifies that NoModificationAllowedError is thrown when mutating read only properties" /> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <body></body> |
| <script> |
| test(function(t) { |
| assert_equals(document.defaultView.getComputedStyle(document.body, null).parentRule, null); |
| }, "Computed style parent (should be null)"); |
| |
| test(function(t) { |
| assert_throws_dom("NoModificationAllowedError", function() { |
| document.defaultView.getComputedStyle(document.body, null).color = "blue"; |
| }); |
| }, "Exception thrown when trying to change a computed style declaration via property"); |
| |
| test(function(t) { |
| assert_throws_dom("NoModificationAllowedError", function() { |
| document.defaultView.getComputedStyle(document.body, null).setProperty("color", "blue"); |
| }); |
| }, "Exception thrown when trying to change a computed style declaration via setProperty"); |
| |
| test(function(t) { |
| assert_throws_dom("NoModificationAllowedError", function() { |
| document.defaultView.getComputedStyle(document.body, null).webkitTransition = ""; |
| }); |
| }, "Exception thrown when trying to change a computed style alias via property"); |
| |
| test(function(t) { |
| assert_throws_dom("NoModificationAllowedError", function() { |
| document.defaultView.getComputedStyle(document.body, null).setProperty("webkitTransition", ""); |
| }); |
| }, "Exception thrown when trying to change a computed style alias via setProperty"); |
| </script> |
