rd bg-dark text-white walkthrough-3">
                <div class="card-header"><h4>Expectations can be presented in a machine-friendly JSON</h4></div>
                <div class="card-body">
                    <p class="code-snippet bg-light text-muted rounded-sm">
{<br />
&nbsp;&nbsp;&nbsp;&nbsp;<span class="json-key">"expectation_type"</span>: <span class="json-str">"expect_column_values_to_not_be_null",</span><br />
&nbsp;&nbsp;&nbsp;&nbsp;<span class="json-key">"kwargs"</span>: {<br />
&nbsp;&nbsp;&nbs