The browser is not closed，but soruce.close()， This error occurs
Contributor guide
Tech stack
javascript
Domain
frontend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
under 1 hour
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
needs investigation
Prerequisites
basic JavaScriptunderstanding of EventSource
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
20
Research direction
Investigate the event source polyfill source code, particularly the close() method and error handling. Look at the error 'the user aborted a request' and determine if it should be caught or suppressed when source.close() is called. Check the issue comments for any reproduction steps.
