| <!DOCTYPE HTML> |
| <html> |
| <head> |
| <script src="../resources/accessibility-helper.js"></script> |
| <script src="../resources/js-test-pre.js"></script> |
| </head> |
| <body> |
| |
| <canvas id="canvas" tabindex="-1"></canvas> |
| |
| <p id="description"></p> |
| <div id="console"></div> |
| |
| <script> |
| description("This test makes sure that AccessibilityNodeObjects are properly detached when the node they point to is deleted."); |
| |
| if (window.testRunner && window.accessibilityController) { |
| window.jsTestIsAsync = true; |
| testRunner.dumpAsText(); |
| |
| // Create an ordinary button on the page, focus it and get its accessibility role. |
| var button = document.createElement('button'); |
| document.body.appendChild(button); |
| button.focus(); |
| |
| axButton = accessibilityController.focusedElement; |
| buttonRole = axButton.role; |
| debug("Button role: " + buttonRole); |
| |
| // Now remove the button from the tree and get the role of the detached accessibility object. |
| document.body.removeChild(button); |
| detachedRole = axButton.role; |
| debug("Button role after being detached: " + detachedRole); |
| shouldBeTrue("buttonRole != detachedRole"); |
| |
| // This time create a button that's a child of a canvas element. It will be focusable but not rendered. |
| // In particular, this will create an AccessibilityNodeObject rather than an AccessibilityRenderObject. |
| var canvas = document.getElementById('canvas'); |
| button = document.createElement('button'); |
| canvas.appendChild(button); |
| |
| // Note: Focusing the button and using that to get its accessibility object creates an extra |
| // reference to the button and it won't get deleted when we want it to. So instead we focus the |
| // canvas and get its first child. |
| canvas.focus(); |
| |
| var axCanvas = null; |
| setTimeout(async function() { |
| await waitFor(() => { |
| axCanvas = accessibilityController.focusedElement; |
| return axCanvas.childrenCount > 0; |
| }); |
| axButton = axCanvas.childAtIndex(0); |
| canvasButtonRole = axButton.role; |
| debug("Canvas button role: " + canvasButtonRole); |
| shouldBe("canvasButtonRole", "buttonRole"); |
| |
| // Now delete the last reference to the button. |
| canvas.removeChild(button); |
| // Explicitly run garbage collection now. Since there are no more references to the button, |
| // it will be destroyed. |
| gc(); |
| |
| // Ensure that the accessibility object is detached by checking its role. |
| detachedCanvasButtonRole = axButton.role; |
| debug("Canvas button role after being detached: " + detachedCanvasButtonRole); |
| shouldBe("detachedCanvasButtonRole", "detachedRole"); |
| |
| finishJSTest(); |
| }, 0); |
| } |
| |
| </script> |
| |
| <script src="../resources/js-test-post.js"></script> |
| </body> |
| </html> |
