2.0.0 would also
raise this error when it encountered an object property identifier that is a
reserved word. This is valid in the ECMAScript 5 specification, but was not
valid previously. In this example we attempt to declare an object property with
the identifier <code>default</code>:</p>
<div class="row editor"><div class="col-md-6"><textarea style="display: none;" class="cm"></textarea><div class="CodeMirror cm-s-default"><div style="overflow: hidden; position: relative; width: 3px; height: 0px; top: 4px