This page describes an anchor link bug (including skipnav links) on iOS while using VoiceOver.
Note: View page source to see the code
This is an issue because many sites include a skip link to the main content of the page. These links usually target the main element itself. The first child of the main element is usually an h1 (page title). On landing pages and home pages, the h1 is often visually hidden because it is redundant (matches the site title).
Additionally, links that target empty named anchors will not work. Links like these are frequently found on FAQ like pages.