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Show persistent UI indicator when SharedArrayBuffer is unsupported

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#7747 opened on May 7, 2026

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good first issuehelp wanteduser interface

Description

Problem

We show the SharedArrayBuffer warning in the app, but it is easy for users to circumvent it by clicking around it and accepting the danger. After that, we never show it again — leaving users with no visual indication that they are running in a degraded/unsupported state.

Proposal

Add a persistent visual UI element (with a tooltip on hover) that shows a danger icon for users whose environment does not support SharedArrayBuffer.

A reasonable place for this could be the header, next to the "sync" / "server status" buttons.

The exact visual UI/UX is up for discussion.

Goals

  • Make it clear to users that their environment is in an unsupported/dangerous state.
  • Persistent indication, not a one-time dismissible warning.
  • Provide context via tooltip (what's wrong, why it matters).

Contributor guide

Tech stack
javascripthtmlcss
Domain
frontend
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
HTMLCSSJavaScriptBasic UI development
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
75
Research direction
Investigate the current SharedArrayBuffer warning implementation to understand how it is shown and dismissed. Look at the header component (likely in React) where sync/server status buttons are located to determine placement. Explore existing tooltip components in the codebase to reuse for hover context. Review any design guidelines or UI component library used in the project.