How to experiment ComputePressure API with Chrome

The Compute Pressure API is currently available in Chrome Canary and Edge Canary behind a flag.

Own local Chromium repository (Linux):

Rebase to latest HEAD and compile the chromium project.
Launch Chrome with the command line flag --enable-features=ComputePressure.
Navigate to about://flags and enable Experimental Web Platform features.
Navigate to the demo page, https://w3c.github.io/compute-pressure/demo/.
Play with the demo.

Chrome/Edge Canary (Windows Only):

Download a version of Chrome with ComputePressure implemented (Chrome Canary) (Edge Canary).
Find your Canary browser in the menu.
Click right and select "properties".
Add to the command line flags --enable-features=ComputePressure. (after the last ")
Start your browser.
Navigate to about://flags and enable Experimental Web Platform features.
Navigate to the demo page, https://w3c.github.io/compute-pressure/demo/.
Play with the demo.

Code Examples:

// Observer Callback.
function pressureObserverCallback(updates) {
  console.log("cpu pressure state = " + updates[0].state);
  console.log("timestamp = " + updates[0].time);
}

// Create observer with 1000ms sample interval.
observer = new PressureObserver(pressureObserverCallback);

// Start observer.
await observer.observe("cpu", { sampleInterval: 1_000 });

You should see, everytime the state changes, the following:

cpu pressure state = nominal
timestamp = 1671114838027.834

cpu pressure state = serious
timestamp = 1671114914289.584

cpu pressure state = critical
timestamp = 1671114926328.48

Stopping observer:

// Stop observer.
observer.unobserve('cpu');

Other API calls and examples can be found in the specification.

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