You can use:
HTML
<body ng-app="demo" ng-controller="MainCtrl">
<span ng-bind-html="foo"></span>
</body>
JavaScript
angular.module('demo', []);
var demo = angular.module('demo').controller('MainCtrl', function ($scope, $sce) {
$scope.foo = $sce.trustAsHtml('"testing" 'quotes' \and backslashes\ <b>and html</b>');
});
And here is a demo.