WindowSharedStorage: worklet property

Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

The worklet read-only property of the WindowSharedStorage interface contains the SharedStorageWorklet instance representing the shared storage worklet for the current origin.

SharedStorageWorklet contains the addModule() method, which is used to add a module to the shared storage worklet.

Value

A SharedStorageWorklet object.

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 for links to other examples.