You mention that you plan to enable this on Android WebView as well. Since WebView currently has a renderer process limit of 1, will any shared workers also run inside that same single renderer process? If so, then I don't think there's any issue for WebView here and I support experimenting/shipping.
On Wed, 25 Mar 2026 at 22:34, Chromestatus <[email protected]> wrote: > *Contact emails* > [email protected], [email protected] > > *Specification* > > https://html.spec.whatwg.org/multipage/workers.html#shared-workers-and-the-sharedworker-interface > > *Summary* > For a long time, SharedWorker has been disabled on Android due to concerns > about its unpredictable process lifecycle. We believed that SharedWorker > instances might terminate unexpectedly, without noticing to users or web > developers, which we considered unacceptable. However, a recent discussion > on GitHub (https://github.com/whatwg/html/issues/11205) suggests that the > unpredictable nature of SharedWorker's process lifecycle might not be as > significant an issue as we once thought. Based on this, we plan to > re-enable SharedWorker on Android while simultaneously investigating this > behavior to ensure a stable and reliable experience. > > *Blink component* > Blink>Workers > <https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EWorkers%22> > > *Web Feature ID* > shared-workers <https://webstatus.dev/features/shared-workers> > > *Motivation* > The long-standing demand for SharedWorker support on Android stems from > several needs expressed by web developers: - Resource Sharing and > Efficiency: Developers aim to share a single WebSocket or Server-Sent > Events (SSE) connection across multiple tabs, thereby conserving resources. > - Persistent Resource Management: There's a strong desire to share and > persist resources across tabs, particularly for technologies like > WASM-based SQLite. - Closing a Feature Gap: It has been noted that other > major mobile browsers, including Safari on iOS and Firefox on Android, > already support SharedWorker, making Chrome on Android the last major > browser to address this gap. > > *Initial public proposal* > *No information provided* > > *TAG review* > *No information provided* > > *TAG review status* > Not applicable > > *Origin Trial Name* > SharedWorker on Android > > *Goals for experimentation* > The goal is to evaluate the real-world impact of Android's process > lifecycle on SharedWorker stability. Unlike on desktop, SharedWorker > instances on Android can be terminated unexpectedly by the operating system > due to memory pressure. This trial allows us to release the feature to > developers who understand this risk and can provide crucial feedback. > Specifically, we aim to measure: 1. The frequency of unexpected > SharedWorker terminations in real-world scenarios. 2. Whether the current > API is sufficient for developers to handle such terminations gracefully. 3. > The necessity of potential spec-level countermeasures, as discussed in > https://github.com/whatwg/html/issues/11205, to bridge this behavioral > gap between mobile and desktop platforms and ensure a consistent developer > experience. The insights from this experiment will be critical in > determining the path to shipping SharedWorker on Android, informing whether > it can be enabled by default or if further mitigation work is required. > > *Chromium Trial Name* > SharedWorkerOnAndroid > > *Origin Trial documentation link* > https://developer.mozilla.org/en-US/docs/Web/API/SharedWorker > > *WebFeature UseCounter name* > kSharedWorkerStartOnAndroid > > *Risks* > > > *Interoperability and Compatibility* > While Chrome has been the sole major browser not to offer SharedWorker, > this change aims to close that gap. However, unlike on desktop, Android's > unpredictable process lifecycle presents a unique risk. SharedWorker > instances might terminate unexpectedly, for example, when a Chrome app is > moved to the background and then foregrounded. This inherent uncertainty in > the Android environment is a key risk when running SharedWorker. > > *Gecko*: Shipped/Shipping > > *WebKit*: Shipped/Shipping > > *Web developers*: Positive As you can see in http://crbug.com/40290702, > SharedWorker support on Android has been a long-awaited feature by web > developers. This demonstrates a clear and sustained demand from the > developer community for this capability. > > *Other signals*: > > *Ergonomics* > n/a > > *Activation* > n/a > > *Security* > This feature is already shipped on desktop, and no new security risks are > introduced with the Android implementation. > > *WebView application risks* > > Does this intent deprecate or change behavior of existing APIs, such that > it has potentially high risk for Android WebView-based applications? > *No information provided* > > > *Debuggability* > This feature is already shipped on desktop, and no new debuggability > issues should be introduced with the Android implementation. > > *Will this feature be supported on all six Blink platforms (Windows, Mac, > Linux, ChromeOS, Android, and Android WebView)?* > No > This aims to make SharedWorker supported on Android and Android WebView. > SharedWorker has been supported other than them. > > *Is this feature fully tested by web-platform-tests > <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>?* > Yes > SharedWorker tests under https://wpt.fyi/results/workers. e.g. > https://wpt.fyi/results/workers/SharedWorker-simple.html Note that since > wpt.fyi runs tests on Linux not Android for Chromium. > > *DevTrial instructions* > https://developer.mozilla.org/en-US/docs/Web/API/SharedWorker/SharedWorker > > *Flag name on about://flags* > *No information provided* > > *Finch feature name* > SharedWorker > > *Rollout plan* > Will ship enabled for all users > > *Requires code in //chrome?* > False > > *Tracking bug* > https://crbug.com/40290702 > > *Measurement* > https://chromestatus.com/metrics/feature/timeline/popularity/5626 > Content.SharedWorker.Host.DestructionSource to understand how SharedWorkers > finish (worker.close(), no clients, or worker gone (possibly crash)). > > *Estimated milestones* > Origin trial desktop first 140 > Origin trial desktop last 144 > Origin trial extension 1 end milestone 147 > Shipping on Android 148 > Origin trial Android first 140 > Origin trial Android last 144 > DevTrial on Android 140 > Shipping on WebView 148 > > *Anticipated spec changes* > > Open questions about a feature may be a source of future web compat or > interop issues. Please list open issues (e.g. links to known github issues > in the project for the feature specification) whose resolution may > introduce web compat/interop risk (e.g., changing to naming or structure of > the API in a non-backward-compatible way). > *No information provided* > > *Link to entry on the Chrome Platform Status* > https://chromestatus.com/feature/6265472244514816?gate=5084552061779968 > > *Links to previous Intent discussions* > Intent to Experiment: > https://groups.google.com/a/chromium.org/d/msgid/blink-dev/6879be98.2b0a0220.72055.015d.GAE%40google.com > Intent to Extend Experiment 1: > https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAPNB-6VPRn%2BLp%2B61oJOc2e3fnY3F1LaZ2f2g_LTsA%3DXv49FzgQ%40mail.gmail.com > > > This intent message was generated by Chrome Platform Status > <https://chromestatus.com>. > > -- > You received this message because you are subscribed to the Google Groups > "blink-dev" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion visit > https://groups.google.com/a/chromium.org/d/msgid/blink-dev/69c49b14.050a0220.2ec94.0888.GAE%40google.com > <https://groups.google.com/a/chromium.org/d/msgid/blink-dev/69c49b14.050a0220.2ec94.0888.GAE%40google.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "blink-dev" group. 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