Web Platform Tests: Storage Pressure

[Jarryd Goodman]

Hello all,

I am interested in writing web platform tests that will test a new storage pressure event. I wanted to know if it was possible to use WebDriver to simulate storage pressure, which is the state in which a device has low free disk space. The event is a DOM event which fires when storage systems identify storage pressure, and the event is dispatched to any script that has registered an event listener, but will not wake ServiceWorkers. I'm hoping to write a test where, at the start, there is no (simulated) storage pressure, I add an event listener, simulate storage pressure, and then listen for any events fired.

Any suggestions on how I could achieve this? Are there any examples of this? Any thoughts or tips would be appreciated.

Thanks!

Jarryd Goodman Software Engineer jar...@chromium.org

[Robert Ma]

AFAIK, there isn't an existing WebDriver command for this. You might need to define a WebDriver extension first (i.e. monkey-patching the WebDriver spec from your spec), similar to what WebAuthn does.

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[Stephen Mcgruer]

Note that we also have a mostly up-to-date guide, https://docs.google.com/document/d/18BpD41vyX1cFZ77CE0a_DJYlGpdvyLlx3pwXVRxUzvI/edit#heading=h.3xm97m7radrn, which can help you through the various steps involved. We know it needs updating, so if you can report problems as you find them that would also be great :D

I would also not look to WebAuthn as a model for your use-case, which is far simpler than what WebAuthn wants from webdriver. The reporting spec has a very simple endpoint that just causes the browser to generate a report; you could define a similar endpoint that causes the browser to fire a storage pressure event.

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