A simple snippet of code to add Squarespace website to add an age confirmation pop-up. To add, go to Setting > Advanced > Code Injection and add the below into the header. Note: Change the imageUrl (line #24) and change the ageGateUrl (lines #43, #51) to redirected underage visitors

SquarespaceConfirmAgeInjection.js

<script src="https://cdn.jsdelivr.net/npm/sweetalert2@9"></script>

<script type="text/javascript">
    //document.onload = checkAge(document.URL);
  function setCookie(name, value, days) {
	var d = new Date();
	d.setTime(d.getTime() + (days * 24 * 60 * 60 * 1000));
	var expires = "expires="+d.toGMTString();
	document.cookie = name + "=" + value + "; " + expires + "; path=/";
  }
  
  var getCookie = function(name) {
	var value = "; " + document.cookie;
	var parts = value.split("; " + name + "=");
	if (parts.length == 2) {
		return parts.pop().split(";").shift();
	}
  };
  
  function JSconfirm(){
	swal.fire({ 
    title: "May we see some ID please?",   
    text: "Please confirm you are of legal age and reside in Canada.",
    imageUrl: 'https://drive.google.com/uc?id=1BbDT_qawXQHEMRpSfPmLhgwCbsBD08JP',
    imageWidth: 120,
    imageHeight: 120,
    imageAlt: '',
    closeOnClickOutside: false,
    closeOnEsc: false,
    allowEnterKey: false,
    showCancelButton: true,
    confirmButtonText: 'Yes',
    cancelButtonText: 'No ',
    focusConfirm: false,
    reverseButtons: true,
    backdrop: `background-color: #171717EF;`
    })
    .then((isConfirm) => {
      if (isConfirm) {   
        setCookie('legal', 1, 30);
        swal.fire({title: "You're all set!", icon:"success", timer: 1400});
      } else {  
        ageGateUrl = 'https://www.treehousecannabis.xyz/age-unverified'
        window.location.href = decodeURIComponent(ageGateUrl);
      } 
    });;
}
  
  document.addEventListener('DOMContentLoaded', function() {
    if (!getCookie('legal')) {
      ageGateUrl = 'https://www.treehousecannabis.xyz/age-unverified'
      if (window.location.href == ageGateUrl) return;
      JSconfirm();
    }
  });
</script>

<style>

.swal2-modal {
  background-color: #17332A;
}
  
.swal2-styled.swal2-cancel {
  color: #171717;
  width: 100;
  background-color: #F2F7ED;
}
  
.swal2-styled.swal2-confirm {
  color: #F2F7ED;
  border: none;
  width: 100;
  background-color: #308989;
}
 
.swal2-title {
  color: #F2FDF7;
}
  
.swal2-content {
  color: #F2F7ED;
}
  
body.swal2-shown > [aria-hidden="true"] {
  filter: blur(10px);
}

body > * {
  transition: 0.1s filter linear;
}


</style>