have happened,
all but the last tick in the past are considered "missed",
and no callback is invoked for them.
The <a href="dart-async/Timer/tick.html">tick</a> count reflects the number of durations that have passed and
not the number of callback invocations that have happened.</p>
        </section>
                <section class="summary source-code" id="source">
          <h2><span>Implementation</span></h2>
          <pre class="language-dart"><code class="language-dart">int get tick;</code></pre>
    