Compulsory voting
Countries that have compulsory voting by law but do not enforce it:Although voting in a country may be compulsory, penalties for failing to vote are not always strictly enforced. In Australia and Brazil, providing a legitimate reason for not voting (such as illness) is accepted. In Argentina, those who were ill on voting day are excused by requesting a doctor to prove their condition; those over away from their voting place are also excused by asking for a certificate at a police station near where they are. Belgian voters can vote in an embassy if they are abroad or can empower another voter to cast the vote in their name; the voter must give a "permission to vote" and carry a copy of the eID card and their own on the actual elections.
Representative democracy in Singapore
Voting in Singapore is compulsory. Any citizen above 21 years of age who is not disqualified by the factors in section 6 of the Parliamentary Elections Act is required to vote in person. There is no constitutional provision stipulating any qualifications for voters, and as the Act is an ordinary piece of legislation the disqualifying factors may be changed by a simple majority (more than 50%) of votes in Parliament.