Back to Snippets

Native Dialog Modal with Backdrop Blur JS

A destructive action opens a confirmation modal. Focus moves into the dialog, Escape or a click on the backdrop cancels, and the two buttons return a value the page can act on.

The modal is a native dialog element opened with showModal, which is what gives it the focus trap, the Escape key and the ::backdrop pseudo-element for free. The buttons sit inside a form with method set to dialog, so pressing one closes the dialog and stores that button's value in returnValue without any click handlers. A click on the backdrop reports the dialog itself as the target while a click inside reports its content, which is how the two are told apart.

The entrance is a CSS transition. @starting-style provides the hidden state to transition from, and allow-discrete on display and overlay lets the fade out finish before the dialog disappears.

#javascript

#css

#dialog

#modal

#popup

#confirm

#accessibility

#ui

Run /HTML *CSS ()JS Output Console0 Live Updates Focus

*, *::before, *::after {
  box-sizing: border-box;
}

body {
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  margin: 0;
  background: #f1f5f9;
  color: #0f172a;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}

.card {
  background: #ffffff;
  width: 100%;
  max-width: 440px;
  padding: 36px;
  border-radius: 20px;
  box-shadow: 0 20px 40px -20px rgba(15, 23, 42, 0.25);
}

.card h1 {
  font-size: 1.375rem;
  margin: 0 0 8px;
}

.card p {
  margin: 0 0 22px;
  color: #475569;
  line-height: 1.6;
}

.status {
  min-height: 1.5em;
  margin: 18px 0 0 !important;
  font-size: 0.875rem;
  font-weight: 500;
}

.btn {
  font: inherit;
  font-weight: 600;
  padding: 11px 18px;
  border: 0;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.15s ease;
}

.btn:active {
  transform: scale(0.98);
}

.btn.danger {
  background: #dc2626;
  color: #ffffff;
}

.btn.danger:hover {
  background: #b91c1c;
}

.btn.ghost {
  background: #f1f5f9;
  color: #0f172a;
}

.btn.ghost:hover {
  background: #e2e8f0;
}

.modal {
  width: min(92vw, 400px);
  padding: 0;
  border: 0;
  border-radius: 20px;
  background: #ffffff;
  box-shadow: 0 30px 60px -20px rgba(15, 23, 42, 0.45);
  opacity: 0;
  translate: 0 12px;
  transition: opacity 0.22s ease, translate 0.22s ease, overlay 0.22s allow-discrete, display 0.22s allow-discrete;
}

.modal[open] {
  opacity: 1;
  translate: 0 0;
}

@starting-style {
  .modal[open] {
    opacity: 0;
    translate: 0 12px;
  }
}

.modal::backdrop {
  background: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  transition: opacity 0.22s ease, overlay 0.22s allow-discrete, display 0.22s allow-discrete;
  opacity: 0;
}

.modal[open]::backdrop {
  opacity: 1;
}

@starting-style {
  .modal[open]::backdrop {
    opacity: 0;
  }
}

.modal form {
  padding: 32px;
  text-align: center;
}

.icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: #fef2f2;
  color: #dc2626;
  margin-bottom: 16px;
}

.modal h2 {
  font-size: 1.25rem;
  margin: 0 0 8px;
}

.modal p {
  margin: 0 0 24px;
  color: #475569;
  line-height: 1.6;
}

.actions {
  display: flex;
  gap: 10px;
  justify-content: center;
}

.actions .btn {
  flex: 1;
}

Native Dialog Modal with Backdrop Blur JS

Share Code Snippet