wpt

It says that it only allows postMessage for cross domain communication. BUT I'm concerned it doesn't mention similar sandbox and feature policies as iFrame. It also mentions that it will allow the 'child' to know if it's inside a portal with window.portalHost but at least this github mentions you can minimally declare no-referrer https://github.com/web-platform-tests/wpt/blob/master/portal... Wouldn't the concern be ads ( I assume this is what this feature is intended for especially on mobile )? If there are no similar restrictions as a iframe safeFrame I can see a ton of ad scams that take advantage...

We use Azure Pipelines for https://github.com/web-platform-tests/wpt with some help from friends at Microsoft, and it's a great product! It's very "power user" in that it's easy to get lost amongst all the options, but nothing else I've tried has the same breadth of OSes and ability to have one job depend on another in intricate ways. And, 10 free parallel builds, including macOS!

I know a little about two of the big open source Rust projects, Servo and the Rust compiler. For integration tests, both the Rust compiler as well as the Servo web engine have written their own test runners with an accompanying set of tools. This allows the test format to be as flexible as the target domain of the program. In fact, servo can just simply use the cross-browser wpt [1] test suite. As for avoiding to initialize heavy objects, I only know about the Rust compiler's test runner initializing the entire compiler every time from zero for every single test file. The result is a quite long testing-time. Suggestions by me to use a shared driver were rejected by them because one test might affect the other one. But in theory you could write your own custom test runner that has as much shared state as possible. You might also want to ch