Goalline technology is used in the same way as semi-automated offsides, but it is not clearcut.
The use of technology to help officials make more accurate offside decisions will be tested at the Arab Cup.
Between 10 and 12 cameras collect up to 29 data points for every player 50 times per second in "semi-automated" offsides.
The video assistant referee (VAR) will make the final call if it spots a potential offside.
The technology could be used at the World Cup.
The number of major mistakes in football has been reduced, but there are still areas where it can be improved, and one of them is in the area of offside.
The process to check offsides can take longer than other decisions, especially when it is very tight. The positioning of the lines may not be perfect.
"For this reason, Fifa is developing a technology which could offer faster and more accurate answers." Semi-automated offside is when a person is not present.
After analyzing the position of the players, the decision is made for offside. Technology can draw a line, but the referee's job is to keep the assessment in check. This is crucial.
Some goals have been ruled out by the smallest of margins since the introduction of VAR in Europe's major leagues. Roberto Firmino's strike for the Reds against the Villa was ruled out because of the fact that his arm was in the air.
The new technology was disrupted by the coronaviruses, but tests have taken place in England, Spain and Germany.
The Arab Cup, which features 16 teams and is staged across six stadiums in Qatar, is the most significant trial for the technology yet.
The technology is based on limb tracking, according to the director of football technology.
An automated alert is sent to the video operations room if there is an offside offence. It is still the VAR who has to confirm the proposed offside at the end of the game. The referee is told about the decision by the VAR.
There are two points of focus. The kick point and which body part is closest to the goalline are the first two things to be focused on. We hope that with technology, we can be more accurate.
