axe-core/lib/checks/keyboard/landmark-is-top-level.js

Accessibility engine for automated Web UI testing

var landmarks = axe.commons.aria.getRolesByType('landmark');
var parent = axe.commons.dom.getComposedParent(node);

this.data({ 
	role: node.getAttribute('role') || axe.commons.aria.implicitRole(node)
});

while (parent){
	var role = parent.getAttribute('role');
	if (!role && (parent.tagName.toLowerCase() !== 'form')){
		role = axe.commons.aria.implicitRole(parent);
	}
	if (role && landmarks.includes(role)){
		return false;
	}
	parent = axe.commons.dom.getComposedParent(parent);
}
return true;