Angular: Empty Fiddle

http://angularjs.org/

HTML

<script src="http://code.angularjs.org/angular-1.0.1.js"></script>
<div ng-controller="MyCtrl">
    <pre>Data <span ng-bind-html-unsafe='logdata'></span></pre>
</div>

JavaScript

var myApp = angular.module('myApp',[]);

myApp.factory('Data', function() {
    var Data = {};
    Data.log = "ERROR - error message";
    Data.log = Data.log.replace(/ERROR/gm, '<span style="color:red;">ERROR</span>')
    return Data;
});

function MyCtrl($scope, Data) {
    $scope.logdata = Data.log;
}