Bug 245212 – AX: Dynamic changes to subtrees of AccessibilityNodeObjects can cause missing or stale content

• Component: Accessibility
• Status: RESOLVED FIXED

[Tyler Wilcock]

AccessibilityNodeObject is missing a few key method implementations that can cause incorrect AX tree construction (either missing or stale content) after dynamic page updates. These methods are:
  - updateChildrenIfNecessary
  - setNeedsToUpdateChildren
  - needsToUpdateChildren
  - setNeedsToUpdateSubtree

[Radar WebKit Bug Importer]

<rdar://problem/99956378>

[Tyler Wilcock]

Created attachment 462352 [details]
Patch

[Andres Gonzalez]

(In reply to Tyler Wilcock from comment #2)
> Created attachment 462352 [details]
> Patch

Good catch!

--- a/LayoutTests/accessibility/display-contents-dynamically-added-children.html
+++ a/LayoutTests/accessibility/display-contents-dynamically-added-children.html

+    function traversePage() {
...
+                let textContent = accessibilityController.platformName === "ios" ? searchResult.description : searchResult.stringValue;
+                testOutput += `\n${textContent}`;

This could be a single line.

+            }
+            testOutput += "\n";
+        }
+    }

Don't really need this second \n.

You also have 

function dumpAccessibilityTree(accessibilityObject, stopElement, indent, allAttributesIfNeeded, getValueFromTitle, includeSubrole) 

in accessibility-helper.js that would also do the trick.

[Andres Gonzalez]

Shouldn't the bug title reflect that this is a display:contents problem?

[Tyler Wilcock]

(In reply to Andres Gonzalez from comment #4)
> Shouldn't the bug title reflect that this is a display:contents problem?
This isn't specific to display:contents. Any AccessibilityNodeObject is affected.

Also, I acknowledge and agree with your suggestions regarding the test. I would prefer not to wait 12 hours for another round of EWS, so I can try to cover those changes in a later patch.

[EWS]

Committed 254534@main (c6e7fc8ecc94): <https://commits.webkit.org/254534@main>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 462352 [details].