## Why is this an issue?

This rule checks that the specified child elements are present inside the specified parent elements.

### Noncompliant code example

Given a parent/child combination of `<head>`/`<title>`:

    <html>
      <head>
      </head>  <!-- Noncompliant; no title element -->
      <body>
        ...

### Compliant solution

    <html>
      <head>
        <title>My Page</title>
      </head>
      <body>
        ...