LibWeb: Make factory method of DOM::AccessibilityTreeNode fallible

Userland/Libraries/LibWeb/DOM/AccessibilityTreeNode.cpp

@@ -13,9 +13,9 @@
 
 namespace Web::DOM {
 
-JS::NonnullGCPtr<AccessibilityTreeNode> AccessibilityTreeNode::create(Document* document, DOM::Node const* value)
+WebIDL::ExceptionOr<JS::NonnullGCPtr<AccessibilityTreeNode>> AccessibilityTreeNode::create(Document* document, DOM::Node const* value)
 {
-    return *document->heap().allocate<AccessibilityTreeNode>(document->realm(), value).release_allocated_value_but_fixme_should_propagate_errors();
+    return MUST_OR_THROW_OOM(document->heap().allocate<AccessibilityTreeNode>(document->realm(), value));
 }
 
 AccessibilityTreeNode::AccessibilityTreeNode(JS::GCPtr<DOM::Node> value)

Userland/Libraries/LibWeb/DOM/AccessibilityTreeNode.h

@@ -17,7 +17,7 @@ namespace Web::DOM {
 class AccessibilityTreeNode final : public JS::Cell {
     JS_CELL(AccessibilityTreeNode, JS::Cell)
 public:
-    static JS::NonnullGCPtr<AccessibilityTreeNode> create(Document*, DOM::Node const*);
+    static WebIDL::ExceptionOr<JS::NonnullGCPtr<AccessibilityTreeNode>> create(Document*, DOM::Node const*);
     virtual ~AccessibilityTreeNode() override = default;
 
     JS::GCPtr<DOM::Node> value() const { return m_value; }

Userland/Libraries/LibWeb/DOM/Document.cpp

@@ -2350,7 +2350,7 @@ JS::NonnullGCPtr<DOM::Document> Document::appropriate_template_contents_owner_do
 DeprecatedString Document::dump_accessibility_tree_as_json()
 {
     StringBuilder builder;
-    auto accessibility_tree = AccessibilityTreeNode::create(this, nullptr);
+    auto accessibility_tree = AccessibilityTreeNode::create(this, nullptr).release_value_but_fixme_should_propagate_errors();
     build_accessibility_tree(*&accessibility_tree);
     auto json = MUST(JsonObjectSerializer<>::try_create(builder));
 

Userland/Libraries/LibWeb/DOM/Node.cpp

@@ -1565,7 +1565,7 @@ void Node::build_accessibility_tree(AccessibilityTreeNode& parent) const
             return;
 
         if (element->include_in_accessibility_tree()) {
-            auto current_node = AccessibilityTreeNode::create(const_cast<Document*>(&this->document()), this);
+            auto current_node = AccessibilityTreeNode::create(const_cast<Document*>(&this->document()), this).release_value_but_fixme_should_propagate_errors();
             parent.append_child(current_node);
             if (has_child_nodes()) {
                 for_each_child([&current_node](DOM::Node& child) {
@@ -1578,7 +1578,7 @@ void Node::build_accessibility_tree(AccessibilityTreeNode& parent) const
             });
         }
     } else if (is_text()) {
-        parent.append_child(AccessibilityTreeNode::create(const_cast<Document*>(&this->document()), this));
+        parent.append_child(AccessibilityTreeNode::create(const_cast<Document*>(&this->document()), this).release_value_but_fixme_should_propagate_errors());
         if (has_child_nodes()) {
             for_each_child([&parent](DOM::Node& child) {
                 child.build_accessibility_tree(parent);