Electoral system for the president

El Salvador
El Salvador, Constitution (1983, as amended in 2014), accessed 19 April 2021
Article 80. The President and the Vice President of the Republic, Deputies of the Legislative Assembly and of the Central American Parliament, and Members of Municipal Councils, are popularly elected functionaries.
When, in the elections for President and Vice President of the Republic, no participating political party or coalition of political parties has obtained an absolute majority of votes in conformity with the scrutiny practiced, a second election shall be carried out between the two political parties or coalition of political parties that have obtained the greatest number of valid votes; this second election shall be held during a period no more than thirty days after the results of the first election were declared to be firm.
When by force majeure or fortuitous case, duly qualified by the Legislative Assembly, the second election cannot be carried out within the indicated period, the election shall take place within a second period of not more than thirty days.