Use option:checked to find the currently selected option:

select.querySelector('option:checked')

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Yes, :checked, not :selected.

This is the same as finding an option with the { selected: true } property in JavaScript:

select.querySelectorAll('option').find((option) => option.selected)

What about the selected attribute?

Note that option[selected] would only find an <option selected> tag. This may be the selected option right after loading the page, but not once the user switched to a different value. It also won't work in JavaScript-heavy applications where you might not be rendering an option tag with the selected attribute in the first place.