 measuring client JavaScript execution times.
      </p>
    </section>
    <section id="sotd">
    </section>
    <section class="informative" id="introduction">
      <h2>Introduction</h2>
      <p>
      Complex web applications currently have limited visibility into where JS
      execution time is spent on clients. Without the ability to efficiently
      collect stack samples, applications are forced to instrument their code
      with profiling hooks that are imprecise and can significantly slow down