Backdrop

Pseudo-element

::backdrop

Styles the backdrop behind a dialog or fullscreen element.

Example

dialog::backdrop {
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

Specificity

0-0-1

Browser Support

All modern browsers

About the Backdrop

The ::backdrop CSS selector belongs to the Pseudo-element category.Styles the backdrop behind a dialog or fullscreen element. Understanding CSS selector specificity and combinators is essential for writing maintainable stylesheets that behave predictably.

The specificity of this selector is 0-0-1. CSS specificity determines which styles are applied when multiple rules target the same element. Higher specificity values take precedence. The specificity hierarchy from lowest to highest is: universal (*) → type/element → class/attribute/pseudo-class → ID → inline styles → !important.

Browser support for Backdrop is: All modern browsers. When using newer CSS selectors like :has(), :is(), or CSS nesting, consider providing fallback styles for older browsers. Use @supports to progressively enhance your stylesheets with modern features while maintaining backward compatibility.

Related Selectors

::before ::after ::selection