Browser support for the canvas element is available in all modern & major mobile browsers <ahref="http://caniuse.com/#feat=canvas"target="_blank">(http://caniuse.com/#feat=canvas)</a>.
Please report these on the GitHub page - at <ahref="https://github.com/nnnick/Chart.js"target="_blank">github.com/nnnick/Chart.js</a>. If you could include a link to a simple <ahref="http://jsbin.com/"target="_blank">jsbin</a> or similar to demonstrate the issue, that'd be really helpful.