Line chart via Elychart with square points insteat of dot

Question

I look a javascript library for creating a simple line charts. Is it possible to create something like this via Elychart?

I read documentation but did not find description of dot's properties. Lots of examples describe only next properies of dot:

 dot: true,
 dotProps: {
      stroke: "white",
      "stroke-width": 2
    }

Now I have next simple prototype.

Is it possible replace dots with squares? I try to use Elychart because these charts look fine by older versions of IE.

Thanks.

Edited: look like google's chart library has such feature(pointShape option for dot).

Could you give me references to library which could be used for line-charts?

Edited 2: I cannot use google chart because it is not possible to use this chart library offline. Maybe could someone recommend me other library which works offline ?