Anchor links within tables don’t scroll to target content in Firefox

Description

Anchor scroll behavior is inconsistent specifically in Firefox. (With this issue, behavior is fine in Chrome, Safari, and Edge.)

Choosing an anchor link that’s inside a table in the page content will update the browser URL without scrolling to page content as expected. In the case of the Controller Actions pages, choosing the exact same item from the sidebar/TOC menu works as expected.

Pages where this can be observed:

• https://craftcms.com/docs/3.x/dev/controller-actions.html
• https://craftcms.com/docs/commerce/3.x/dev/controller-actions.html
• https://craftcms.com/docs/3.x/config/ (see CRAFT_BASE_PATH link)

Steps to reproduce

1. Visit one of the pages above in Firefox.
2. Find a link within a table in the main content and click it.
3. Observe that nothing happens.
4. Find the equivalent link in the sidebar or other page copy and click it.
5. Observe that you’re immediately scrolled to the expected content.

Additional Information

Firefox 88.0 on macOS 11.3.

Reproduce the issue in Firefox on the listed Controller Actions or config documentation pages, comparing links inside tables with equivalent sidebar links. Trace the documentation site's anchor-link handling from the page or site entry point used for those pages. Done means table-contained anchors update the URL and scroll to the same target content in Firefox as in other browsers.