Voters in U.K. Cast Ballots Online, in Test for Internet Voting

LONDON—Members of the U.K.’s ruling Conservative Party who are voting to decide the country’s next prime minister are for the first time casting ballots online in a leadership election, a rarity among democracies wary of internet voting because of cybersecurity concerns

Over a several-week period, the party is offering internet voting alongside voting by mail, in part to provide greater convenience during August weeks when Britons take vacation and to avoid disruptions by striking postal workers. The results are to be announced Sept. 5.