/// <summary>
/// Appends the given rule to the list of rules.
/// </summary>
/// <param name="rule">The rule to append.</param>
/// <returns>The current font-face rule.</returns>
internal CSSFontFaceRule AppendRule(CSSProperty rule)
{
_cssRules.Set(rule);
return(this);
}
/// <summary>
/// Appends the given rule to the list of rules.
/// </summary>
/// <param name="rule">The rule to append.</param>
/// <returns>The current font-face rule.</returns>
internal CSSPageRule AppendRule(CSSProperty rule)
{
_style.Set(rule);
return(this);
}