Matchmedia not present, legacy browsers require a polyfill

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Explanation:

The matchMedia method is a JavaScript function that allows you to check if a specific CSS media query is currently active or not. It returns a MediaQueryList object that represents the state of the media query. However, this method is not supported in legacy browsers (such as Internet Explorer versions prior to 10).

To ensure compatibility with legacy browsers, you can use a polyfill. A polyfill is a piece of code that provides the functionality of a feature in browsers that do not support it natively.

Example:

Here is an example of how to use the polyfill for matchMedia in a legacy browser:

    
// Check if the matchMedia method is supported
if (!window.matchMedia) {
  // Polyfill code for matchMedia
  window.matchMedia = function(mediaQuery) {
    var style = document.createElement('style');
    style.type = 'text/css';
    style.styleSheet ? style.styleSheet.cssText = mediaQuery : style.appendChild(document.createTextNode(mediaQuery));
    document.getElementsByTagName('head')[0].appendChild(style);
    return {
      matches: style.sheet.cssRules[0].style.display === 'none' ? false : true,
      media: mediaQuery,
      addListener: function() {},
      removeListener: function() {}
    };
  };
}

// Use matchMedia as usual
var mq = window.matchMedia('(max-width: 768px)');
if (mq.matches) {
  // Media query is active
  console.log('The screen width is less than or equal to 768px');
} else {
  // Media query is not active
  console.log('The screen width is greater than 768px');
}

In the above example, we first check if the matchMedia method is already supported by the browser. If not, we define a polyfill function that emulates the behavior of matchMedia. The polyfill creates a new style element and appends it to the head element of the document.

We then return an object that contains the necessary properties and methods to simulate the behavior of matchMedia. This allows us to use matchMedia as usual, regardless of whether the browser natively supports it or not.

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