As already stated it's partly about the convenience. Click a link, there it is, source code et al. The other reason is that most of us are familiar with the on

As already stated it's partly about the convenience. Click a link, there it is, source code et al. The other reason is that most of us are familiar with the online world a large amount of us will have written JS and therefore have an emotional investment of some sort in it. Thanks to the recent JS engine/browser wars the possibilities have come on so far that it would have been almost inconceivable to have seen this five years ago in the IE dark ages so seeing it live like that is fascinating and gives an endorphin-fuelled sense of 'how far we've come'.