Screen Resolution Detect

You’ll need to use JavaScript. To get the width and height of the screen:

<script>
    var height = window.screen.height;
    var width = window.screen.width;
</script>

To properly take into account higher resolution devices, like Apple’s ‘retina’ displays you will want to multiply those values by the ‘pixel ratio’:

<script>
    var pixelRatio = window.devicePixelRatio;
    var height = window.screen.height * pixelRatio;
    var width = window.screen.width * pixelRatio;
</script>