How to handle scaling for programmatically created elements

I'm working on a text animation plugin. Basically i created a div and append it to canvas.

Of course when the window is resized, the div will stay as it is. I want it to be scaled down like the other

Should I copy the div's pixels and draw them to canvas, so i can manipulate it?

I would recommend opening up the button plugin to see how they accomplished it. There's quite a bit of doing, to get it correct.