Returns a page's geometry, loading the page first if needed (a remote page is prefetched), and caches it.
public ValueTask<PageMetrics> GetPageMetricsAsync(int pageIndex, CancellationToken cancellationToken = default(CancellationToken))
The zero-based page.
Stops the load.
ISO 32000-2 §7.7.3.3 and §14.11.2.