Stop cloning sessionStorage for windows opened with noopener

Category: Offline / Storage
Type: No developer-visible change
Status: Enabled by default (Chrome 89)
Intent stage: Prepare to ship

Breaking change: No
Enterprise impact: None
Chromium flag: kCloneSessionStorageForNoOpener
Spec maturity: Incubation
Web Platform Tests: Yes

WPT details: The corresponding test is https://github.com/w3c/web-platform-tests/commit/12dd602c7b478057bfd70e4243eea395cc1d1876

Summary

When a window is opened with noopener, Chrome should not clone the sessionStorage of its opener; it should instead start from an empty sessionStorage namespace.

Motivation

This is a bugfix to match the HTML specification, which added this behavior in 2017: https://github.com/whatwg/html/pull/2832

Standards & signals

Firefox: Shipped/Shipping
Safari: No signal
Web developers: No signals
Tracking bug: https://bugs.chromium.org/p/chromium/issues/detail?id=771959

Ecosystem

Web Platform Tests: https://wpt.fyi/results/?q=stop-cloning-sessionstorage-for-windows-opened-with-noopener
Chrome Platform Showcase: https://chrome-platform-showcase.paulkinlan-ea.deno.net/features
GenDN reference: https://gendn.paulkinlan-ea.deno.net/features
chrome.dev demos search: https://www.google.com/search?q=site%3Achrome.dev+Stop%20cloning%20sessionStorage%20for%20windows%20opened%20with%20noopener
MDN Web Docs: https://developer.mozilla.org/en-US/search?q=Stop%20cloning%20sessionStorage%20for%20windows%20opened%20with%20noopener
Baseline status: https://webstatus.dev/?q=Stop%20cloning%20sessionStorage%20for%20windows%20opened%20with%20noopener

View on chromestatus.com