Problem:

Is it possible to make a search by querySelectorAll() using multiple unrelated conditions? If yes, how? And, how to specify whether those are AND or OR criteria?

For example:

How to find all forms, ps and legends with a single querySelectorAll() call? Possible?

Solution:

Yes, because querySelectorAll accepts full CSS selectors, and CSS has the concept of >selector groups, which lets you specify more than one unrelated selector. For instance:

...will return a list containing any element that is a form or p or legend.

CSS also has the other concept: Restricting based on more criteria. You just combine multiple aspects of a selector. For instance:

...will return a list of all div elements that also (and) have the class foo, ignoring other div elements.

You can, of course, combine them:

...which means "Include any div element that also has the foo class, any p element that also has the bar class, and any legend element that's also inside a div."

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