FIRST_NOT_H1(level) {
        return {
            title: "First heading is not an &lt;h1&gt;",
            description: `
                <div>
                    To give your document a proper structure for assistive
                    technologies, it is important to lay out your headings
                    beginning with an <code>&lt;h1&gt;</code>. We found an
                    <code>&lt;h${level}&gt;</code> instead.
                </div>
            `
        };
    }
A plugin to identify and validate heading tags (<h1>, <h2>, etc.)