| <!DOCTYPE html> |
| <script src="../../resources/testharness.js"></script> |
| <script src="../../resources/testharnessreport.js"></script> |
| <body> |
| <!-- |
| Adapted from clusterfuzz case filed in https://crbug.com/778956. |
| This bug was a combination of 2 things: |
| - calling appendChild with an iframe's body as the child causes the |
| iframe body to become null |
| - changing a body's margin height in an event handler reacting a |
| change in the same body's margin width causes a method call on the |
| body without checking if it's null. The change in height does not |
| complete immediately, some of the change is applied to the Node |
| _after_ the handler completes by which point the node (body) has |
| become null. |
| --> |
| <iframe id=html_iframe></iframe> |
| <div id=html_div></div> |
| <script> |
| setup({ allow_uncaught_exception: true }); |
| |
| function reactToWidthChange() { |
| // null the body |
| html_div.appendChild(html_iframe.contentDocument.body); |
| // change the height |
| html_iframe.marginHeight = "0"; |
| } |
| |
| test(() => { |
| window[0].addEventListener("DOMSubtreeModified", reactToWidthChange); |
| html_iframe.marginWidth = "0"; |
| }, 'try-trigger-crash'); |
| </script> |
| </body> |
