Use worker API to exec selector simultaneously

[piquark6046]

If a selector without non-standard CSS properties matches huge amount of elements, large amount of CPU and memory resources are required to check the non-standard CSS properties.
It means that checking process with non-standard CSS properties will take some times.

However, using p-limit npm package can execute a selector with non-standard CSS properties simultaneously according to navigator.hardwareConcurrency ¹.
It reduces the taking time to execute a selector to select the elements.

Footnotes

1. Please note that some privacy protection features mock the property with a number lower than the actual number. (e.g., Brave web browser's fingerprinting blocking and Firefox's privacy.resistFingerprinting in about:config) ↩

[piquark6046]

After some researches p-limit npm package does not offer an actual multi-threading.
For web browser, use Web Worker API instead.
For Node.js, use Worker Threads API.
If you want a npm package, use workerpool.