The slider displays in FF, Chrome, Edge and IE 11 & 10.
HTML Code:
<script type="text/javascript">
$(document).ready(function () {
  
var slideCol = document.getElementById("id1");
var y = document.getElementById("f");

y.innerHTML = slideCol.value; // Display the default slider value
slideCol.onchange = displayCol;
// Update the current slider value (each time you drag the slider handle)
slideCol.oninput = displayCol;
function displayCol() {
    y.innerHTML = this.value;
	    if (this.value == "<?php echo SPAM_TEST; ?>") {
      y.innerHTML = "<?php echo SPAM_ANSWER; ?>";
    }     
	}
});

</script>