Masterbar
The Masterbar used across all of WordPress.com is based on this component. If changes are made to the Masterbar here, they should probably also be reflected there.
These components should not be called directly. They are managed by the main layout components.
masterbar.jsx
This is the masterbar skeleton header and styling, used by logged-out.jsx and logged-in.jsx respectively, which pass their items as children to this component.
logged-out.jsx
Renders a logged-out masterbar with only a "WordPress.com" link.
logged-in.jsx
Renders the masterbar with props.user data for displaying the user avatar.