Knockout with HTML Entity

HTML

<script src="https://github.com/downloads/SteveSanderson/knockout/knockout-2.1.0.debug.js"></script>
<script src="https://raw.github.com/SteveSanderson/knockout.mapping/master/knockout.mapping.js"></script>
<p>HTML: &larr;</p>
<p>Knockout: <span data-bind='html: field.value'></span></p>

JavaScript

var data = { value : '1'};

var viewModel = {
    field: ko.mapping.fromJS(data)
};

ko.applyBindings(viewModel);