[moving this to the right mailing list]
Daniel Glazman wrote:
Oh come on. So to test if the childhood combinator ">" is implemented

Why would you be testing that?  What's the use case?

The way I see this working in practice is something like this:

  var elements;
  try {
    elements = document.querySelectorAll("something");
  } catch (e) {
    // Use a slower implementation of the "something" selector
  }

This is certainly how I expect JS libraries to use querySelectorAll...

In what cases would you want to check whether a selector is parsed but _not_ actually try matching against it?

-Boris

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