The HTML slot element is part of the Web Components technology suite and allows the separation of DOM trees. It contains global attributes and a name attribute. Named slots are the type of slot with a name attribute. This is the most common type of slot element. A named slot has the same attributes as a regular slot, but has a different name.
In an effort to increase competition and reduce costs, the European Union has enacted new regulations for slot allocation. In order to ensure an open and competitive air travel market, airlines should allocate unused slots to other carriers. Slots have long been a source of conflict between airlines, which is why the new regulations will help make the airline industry more efficient.