demos: scroll is not showing on IE11 or Edge

[luisrudge]

Edge:

IE11:

Chrome:

[ehzhang]

Thank you for bringing this up! This appears to be a duplicate of #15.

[mikechabot]

+1 on this 2 year old issue

Breaks on fixed-data-table/internal/DOMMouseMoveTracker.js

      if (this._animationFrameID === null) {
        // The mouse may move faster then the animation frame does.
        // Use `requestAnimationFramePolyfill` to avoid over-updating.
        this._animationFrameID = requestAnimationFramePolyfill(this._didMouseMove);
      }