This thread is trying to answer question "Is there a way to run all spec files in parallel, not the tests within the spec files, without using test.serial keyword?"
If your configuration specifies fullyParallel: false or omits the fullyParallel setting altogether, then the (default) behaviour is for different spec files to run in parallel, but the tests within the spec files to run in sequence.
https://playwright.dev/docs/api/class-testproject#test-project-fully-parallel
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