Before submitting...

• I have searched for duplicate or closed issues.
• I have read the CONTRIBUTING document and my issue is following the guidelines.
• I have read the template completely before filling it in.

Context

If the user scrolls the page outside of the scrollspy elements, there will be no active element in the section table-of-contents. In most cases, this is fine. However, if it's necessary to keep the last active element visible in the section table-of-contents, the component doesn't provide a way to do so.

Current Behavior

Let's imagine a blog web page with 2 sections:

• main section
  • introduction
  • body
  • summary
• comments

Main section is wrapped in scrollspy component.
When the user scrolls down from the main section through comments, there will be no active element in section table-of-contents.

Expected behavior

To introduce a flag keepLastActiveElementVisible (or any other name, TBD) that allows keeping the element visible inside section table-of-contents if scrollbar is outside the scrollspy elements.

Possible Solutions or Causes

To introduce that flag, if the proposal is approved then I can implement it!

Your Environment

• Version used:
• Browser Name and version:
• Operating System and version (desktop or mobile):
• Additional information you want to tell us: