We will probably never know how many hundreds of millions of eyes around the world will be turned towards London during the first week of May when King Charles III and Queen Camilla are crowned. In 1953 when Queen Elizabeth II was crowned it was estimated that in the UK alone 27 million people from a population of 36 million watched her Coronation on television and there was no internet then.
It was 40 years later that the World Wide Web was opened to the public by the European Organization for Nuclear Research (CERN). In January this year there were 5.16 billion internet users worldwide, that's almost 65% of the world's population and almost all of them will have the opportunity to watch the Coronation.
The UK Government Library has published an excellent document that provides everything that you are likely to want to know about the history of Coronations in the UK and you can download a free copy from: https://commonslibrary.parliament.uk/research-briefings/cbp-9412/
Another essential source of information is the Royal Family's website at: https://coronation.gov.uk/