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HTML

              
                .info Device Info:
  mark#info Mobile

p.desc Check if the device is bigger than 576 pixels. <br> Using media query inside JavaScript.<br>
  code (min-width: 576px)

              
            
!

CSS

              
                .info {
  font-size: 18px;
  font-weight: bold;
}

/*
  CSS USED FOR THE TEMPLATE
*/

* {
  box-sizing: border-box;
}

body {
  padding: 0;
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
  color: #252631;

  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  height: 100vh;
  background-color: #efefef;
}

.desc {
  max-width: 400px;
  opacity: 0.6;
  text-align: center;
  line-height: 1.6;
}

              
            
!

JS

              
                const outputElement = document.getElementById("info");

const smallDevice = window.matchMedia("(min-width: 576px)");

smallDevice.addListener(handleDeviceChange);

function handleDeviceChange(e) {
  if (e.matches) outputElement.textContent = "Bigger Than Mobile";
  else outputElement.textContent = "Mobile";
}

// Run it initially
handleDeviceChange(smallDevice);

              
            
!
999px

Console