A more thorough explanation:

A coronation case is a legal dispute that arose from the postponement of the coronation of King Edward VII due to his illness. Many people had made contracts and arrangements for the coronation, and when it was cancelled, they suffered financial losses.

For example, one person had hired a ship to watch the naval review by King Edward VII and for a day's cruise around the fleet. When the naval review was cancelled, the person argued that the contract was frustrated and they should not have to pay for the ship. However, the court ruled that the day's cruise around the fleet was still possible, and therefore the contract was not frustrated.

Another example could be a person who had booked a hotel room for the coronation and had to cancel it when the event was postponed. They may have tried to argue that the hotel should refund their money, but the hotel could argue that they had not breached the contract as they had provided the room as agreed.

These examples illustrate how the postponement of the coronation caused many legal disputes over contracts and financial losses. The courts had to decide whether the contracts were frustrated or whether the parties were still obligated to fulfill their agreements.