24: A conforming printer MUST NOT treat [an] attribute [marked as may] as an error[: xml:lang ]
Tests for assertions 24

<b> tag (inline): This text should be bold

<big> tag (inline): This text must be big

<hr> tag (block): There must be a line below this

<i> tag (inline): This text must be italic

<small> tag (inline): This text must be small

<sub> tag (inline): subscript

<sup> tag (inline): superscript

<tt> tag (inline): This text must be monotype