className fix

[supahero1]

Other classes could be added via styling or by hooking to document.createElement(). This is the safe way to do it.

[Cazka]

thanks for you pr, i have left some comments 👍

[Cazka]

closing this, since we are now using Symbols:

const CANVAS_KIT_BYPASS = Symbol('CanvasKit-bypass');
...
const canvas = document.createElement('canvas');
(canvas as any)[CANVAS_KIT_BYPASS] = true;