HTML5 is so important is the use of mobile devices to access the internet.
This is the new wave for mobility, so adopting HTML5 is a must. iOS and Android are both here to stay so if developers want to enlarge their market share and save time from duplicating apps with two different OS’s, HTML5 is the way to go.
They are in support of many features that HTML5 has to offer and will most likely be dictating the direction HTML5 will go on the features they are not supporters of quite yet.
It is important to watch how HTML5 unfolds in the near future because predictions are that by 2014, HTML5 will be the standard for the previously mentioned web browsers.