 reader.
            An alternative column header name can be provided to screen readers by applying the <code>abbr</code> attribute to the <code>th</code> elements.
            So, each <code>th</code> element includes an <code>abbr</code> attribute containing the full spelling of the name of the day for that column.
          </p>
        </section>
      </section>

      <section>
        <h2>JavaScript and CSS Source Code</h2>
        <ul id="css_js_files">
          <li>
            CSS:
            <