JSFiddle - React, Tailwind, and code Playground

by Salvador Dali

HTML

<div data-bind="attr:{title : tooltip}">Ko 2 line tooltip</div>
<div title="Line1: 4 &#13; Line2: 7842">Normal 2 line tooltip</div>

JavaScript

function vm() {
    var self = this;
    this.a        = ko.observable(4);
    this.b        = ko.observable(7842);
    
    this.tooltip = ko.computed(function() {
        return "Line1: "+self.a()+" &#13; Line2: " + self.b();
    });
}

ko.applyBindings(new vm());