CanvasJS is built using Canvas element. Canvas element is a part of HTML5 specification and allows drawing graphics via scripting. It is supported in all the modern browsers. https://en.wikipedia.org/wiki/Canvas_element#Support
CanvasJS StockChart renders seamlessly across all modern browsers and devices and also works in IE8 using excanvas as a fallback.
Below is the list of browsers and platforms on which CanvasJS StockChart has been tested.