MediaQueryListEvent

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2020.

The MediaQueryListEvent object stores information on the changes that have happened to a MediaQueryList object — instances are available as the event object on a function referenced by a change event.

Constructor

MediaQueryListEvent(): Creates a new MediaQueryListEvent instance.

Instance properties

The MediaQueryListEvent interface inherits properties from its parent interface, Event.

MediaQueryListEvent.matches Read only: A boolean value that is true if the document currently matches the media query list, or false if not.
MediaQueryListEvent.media Read only: A string representing a serialized media query.

Instance methods

The MediaQueryListEvent interface inherits methods from its parent interface, Event.

Examples

const para = document.querySelector("p"); // This is the UI element where to display the text
const mql = window.matchMedia("(width <= 600px)");

mql.addEventListener("change", (event) => {
  if (event.matches) {
    // The viewport is 600 pixels wide or less
    para.textContent = "This is a narrow screen — less than 600px wide.";
    document.body.style.backgroundColor = "red";
  } else {
    // The viewport is more than 600 pixels wide
    para.textContent = "This is a wide screen — more than 600px wide.";
    document.body.style.backgroundColor = "blue";
  }
});

Specifications

Specification
CSSOM View Module # the-mediaquerylist-interface