I must have missed something.  I wasn't aware WebGL had advanced to quite this point.   This is a really cool proof of concept demo from MadebyEvan.com showing that WebGL can accurately simulate water,  as well as the behavior of lighting in water.   The fact that this runs as well as it does even on my lowly 2012 Macbook Air is super impressive.    I'm embedding a youtube video of the effect below in case your browser or computer doesn't support the effect,  but I highly suggest you check it out at the site instead.  Really, REALLY, cool.