The paper-tab elements are role=tab so they are "interactive" elements. They expect a flag of link to look for an a nested inside of the tab. This breaks the nested interactive accessibility rule (both tab and a are interactive and will confuse a screenreader), and it's making the entire navigation at the top not keyboard navigable.
The paper-tab elements are role=tab so they are "interactive" elements. They expect a flag of link to look for an a nested inside of the tab. This breaks the nested interactive accessibility rule (both tab and a are interactive and will confuse a screenreader), and it's making the entire navigation at the top not keyboard navigable.