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 MediaQueryList.onchange property or MediaQueryList.addListener() call.


 Creates a new MediaQueryListEvent instance.


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

MediaQueryListEvent.matchesRead only
 A Boolean that returns true if the document currently matches the media query list, or false if not.
MediaQueryListEvent.mediaRead only
 A DOMString representing a serialized media query.


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


var mql = window.matchMedia('(max-width: 600px)');

function screenTest(e) {
  if (e.matches) {
    /* the viewport is 600 pixels wide or less */
    para.textContent = 'This is a narrow screen — less than 600px wide.'; = 'red';
  } else {
    /* the viewport is more than than 600 pixels wide */
    para.textContent = 'This is a wide screen — more than 600px wide.'; = 'blue';



Specification Status Comment
CSS Object Model (CSSOM) View Module
The definition of 'MediaQueryListEvent' in that specification.
Working Draft Initial definition

Browser compatibility

BCD tables only load in the browser

See also