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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/ToggleEvent/oldState below:

ToggleEvent: oldState property - Web APIs

Baseline 2023

Newly available

The oldState read-only property of the ToggleEvent interface is a string representing the state the element is transitioning from.

A string. Possible values are "open" (the popover is going from showing to hidden) or "closed" (the popover going from hidden to shown).

const popover = document.getElementById("mypopover");

// …

popover.addEventListener("beforetoggle", (event) => {
  if (event.oldState === "open") {
    console.log("Popover is being hidden");
  } else {
    console.log("Popover is being shown");
  }
});

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