Internet browser Google has designed a doodle to mark the Turkish presidential election.

On Google's Turkish home page, the company’s logo is transformed into a three-dimensional right-angle with a ballot box decorated with the Turkish flag at the bottom. A ticked ballot paper is being put in the box.

By clicking on the doodle web users are taken to entries on Sunday’s election.

Google has previously used topical subjects as the basis for doodles, marking national holidays, cultural issues or important figures in history.

The first was in 1998 when Google staff took time off work to attend the Burning Man festival.