There are links to sample react sandboxes for each item, but the contain html samples.
Hi @eal2100! The masthead component is currently a patternfly core (html/css) implementation and is still in development. Here is the core epic tracking the masthead component development - https://github.com/patternfly/patternfly/issues/3658.
And here is the patternfly-react issue that we will use to build the masthead as a react component if you would like to subscribe and get updates as its built - https://github.com/patternfly/patternfly-react/issues/5124.