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Showing content from http://developer.mozilla.org/fr/docs/Web/API/HTMLDialogElement/close_event below:

HTMLDialogElement: close event - Les API Web

Baseline Widely available

L'événement close est déclenché sur un objet HTMLDialogElement lorsque la boîte de dialogue qu'il représente a été fermée.

<dialog class="example-dialog">
  <button class="close" type="reset">Close</button>
</dialog>

<button class="open-dialog">Open dialog</button>

<div class="result"></div>

button,
div {
  margin: 0.5rem;
}

const result = document.querySelector(".result");

const dialog = document.querySelector(".example-dialog");
dialog.addEventListener("close", (event) => {
  result.textContent = "dialog was closed";
});

const openDialog = document.querySelector(".open-dialog");
openDialog.addEventListener("click", () => {
  if (typeof dialog.showModal === "function") {
    dialog.showModal();
    result.textContent = "";
  } else {
    result.textContent = "The dialog API is not supported by this browser";
  }
});

const closeButton = document.querySelector(".close");
closeButton.addEventListener("click", () => {
  dialog.close();
});

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