or
    example, loading the CSS lexer within the HTML lexer looks like:</p>

    <pre><code>
    local css = lexer.load('css')
    </code></pre>

    <p>The next part of the embedding process is telling the parent lexer when to
    switch over to the child lexer and when to switch back. The lexer refers to
    these indications as the &ldquo;start rule&rdquo; and &ldquo;end rule&rdquo;, respectively, and are
    just LPeg patterns. Continuing with the HTML/CSS example, the transition from
    HTML to CSS is