| <!DOCTYPE html> |
| <style> |
| #spacer { |
| width: 200%; |
| height: 200%; |
| } |
| </style> |
| <body> |
| <script> |
| window.addEventListener("message", onMessageReceived); |
| |
| function test(api, args) { |
| let did_throw = false; |
| try { |
| document[api](args); |
| } catch(e) { |
| did_throw = true; |
| } |
| return did_throw; |
| } |
| |
| function onMessageReceived(e) { |
| let msg = e.data; |
| |
| msg.did_throw_exception = test(msg.api, msg.args); |
| if (msg.query) { |
| let el = document.querySelector(msg.query); |
| msg.value = el ? el.innerHTML : false; |
| } |
| ackMessage(msg, e.source); |
| } |
| |
| function ackMessage(msg, source) { |
| source.postMessage(msg, "*"); |
| } |
| </script> |
| </body> |
