WindowSharedStorage

Deprecated

Avoid using this feature in new projects. This feature may be a candidate for removal from web standards or browsers.

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The WindowSharedStorage interface of the Shared Storage API represents the shared storage for a particular origin within a standard browsing context.

WindowSharedStorage is accessed via Window.sharedStorage.

Instance properties

worklet: Contains the SharedStorageWorklet instance representing the shared storage worklet for the current origin. SharedStorageWorklet includes the addModule() method, which is used to add a module to the shared storage worklet.

Instance methods

WindowSharedStorage inherits properties from its parent interface, SharedStorage.

run(): Executes a Run output gate operation that has been registered in a module added to the SharedStorageWorklet of the current origin.
selectURL(): Executes a URL Selection output gate operation that has been registered in a module added to the SharedStorageWorklet of the current origin.

Examples

// Randomly assigns a user to a group 0 or 1
function getExperimentGroup() {
  return Math.round(Math.random());
}

async function injectContent() {
  // Add the module to the shared storage worklet
  await window.sharedStorage.worklet.addModule("ab-testing-worklet.js");

  // Assign user to a random group (0 or 1) and store it in shared storage
  window.sharedStorage.set("ab-testing-group", getExperimentGroup(), {
    ignoreIfPresent: true,
  });

  // Run the URL selection operation
  const fencedFrameConfig = await window.sharedStorage.selectURL(
    "ab-testing",
    [
      { url: `https://your-server.example/content/default-content.html` },
      { url: `https://your-server.example/content/experiment-content-a.html` },
    ],
    {
      resolveToConfig: true,
    },
  );

  // Render the chosen URL into a fenced frame
  document.getElementById("content-slot").config = fencedFrameConfig;
}

injectContent();

See the Shared Storage API landing page for a walkthrough of this example and links to other examples.