IE11 - error thrown

[crisward]

https://github.com/sveltejs/svelte-virtual-list/blob/master/VirtualList.svelte#L122

.scrollTo only exists on window in IE. So this cause an error to be thrown.

https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollTo

This can be fixed by adding a check first

viewport.scrollTo && viewport.scrollTo(0, scrollTop + d);

Apart from that, works fine in IE. If you'd prefer this in the form of a pull request, let me know.

[crisward]

BTW looks like it could be just as easy to use scrollTop instead.

https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollTop