[Feature]: I hope you can support global assertions in your YAML scripts.

What problem does this feature solve?

I'm a web UI tester, and I'd like to be able to detect common issues like font glitches and image obstructions on every page by adding global assertions to the YAML file, without having to add similar descriptions to each assertion statement.

What does the proposed API look like?

page: url: https://www.bing.com publicAIAssert: There are no obvious font obstructions, image loading errors, or error messages on the page. tasks:

• name: Search for weather