in src/main/resources/libs/sling/logtail-plugin/js/tail.js [199:211]
$("#highlighting").find(".add").click(function(e) {
var val = $("#highlighting").find("#search").val();
var color = $("#forecolor").val();
var bg = $("#backcolor").val();
var b = $("#bold").is(":checked");
var i = $("#italic").is(":checked");
var index = searchCriteria.length;
searchCriteria.push({"string":val, "bold":b, "italic":i, "forecolor":color, "backcolor":bg});
$("#highlighting").find(".criteria-list").append("<li class='criteria-item' data-index='" + index + "'><span class='box' style='color:"+color+";background-color:"+bg+";font:" + (b?" bold ":"") + (i?" italic ":"") + ";'>" + val + "</span>" + val + "</li>");
$("#highlighting").find("#search").val("");
$("#highlighting").find("#bold")[0].checked = false;
$("#highlighting").find("#italic")[0].checked = false;
});