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WPT coverage

Status: Open.

#425 In tc39/proposal-shadowrealm;

· annevk opened on May 12, 2026

Spec bug: Thenable module breaks assert

Status: Open.

#424 In tc39/proposal-shadowrealm;

· o- opened on Mar 26, 2026

Spec bug: dynamic import inside a ShadowRealm.evaluate actually import the module in the upper realm.

Status: Open.

#423 In tc39/proposal-shadowrealm;

· Jack-Works opened on Nov 27, 2025

Control, Safety, Performance?

Status: Open.

#421 In tc39/proposal-shadowrealm;

· brandon942 opened on Sep 2, 2025

Pause/freeze realm execution?

Status: Open.

#420 In tc39/proposal-shadowrealm;

· foxt opened on Aug 7, 2025

Use case: MCP servers

Status: Open.

#418 In tc39/proposal-shadowrealm;

· kentcdodds opened on Apr 13, 2025

Use case - Script sandboxing for 3rd party tools

Status: Open.

#417 In tc39/proposal-shadowrealm;

· xaviergonz opened on Feb 21, 2025

Intersection with Dynamic Code Brand Checks proposal

Status: Open.

#414 In tc39/proposal-shadowrealm;

· fred-wang opened on Nov 20, 2024

Considering the impact of ShadowRealm on ad blocking, privacy and similar browser extensions

Status: Open.

#406 In tc39/proposal-shadowrealm;

· kzar opened on Jun 7, 2024

Clarify object/value sharing limitations in explainer

Status: Open.

#405 In tc39/proposal-shadowrealm;

· joliss opened on Apr 23, 2024

Feature Enabling

Status: Open.

#404 In tc39/proposal-shadowrealm;

· Autumnlight02 opened on Apr 21, 2024

Enable writing code directly to be evaluated synchronously

Status: Open.

#402 In tc39/proposal-shadowrealm;

· ByteEater-pl opened on Apr 13, 2024