CSS: style.css Input: <em>Emphasis</em> Result: <em>Emphasis</em> Input: <img src="http://jigsaw.w3.org/css-validator/images/vcss"/> Result on span: <img src="http://jigsaw.w3.org/css-validator/images/vcss"/> Result alone: <img src="http://jigsaw.w3.org/css-validator/images/vcss"/> Without closing: <img src="http://jigsaw.w3.org/css-validator/images/vcss"> <div markdown="1"> This is *true* markdown text (paragraph) <p markdown="1"> This is *true* markdown text (no paragraph) </p> </div> <table> <tr> <td markdown="1">This is *true* markdown text. (no par)</td> <td markdown="block">This is *true* markdown text. (par)</td> </tr> </table> The following is invalid HTML, and will generate an error: <table> <td markdown="1">This is *true* markdown text. (no par)</td> <td markdown="block">This is *true* markdown text. (par)</td> </tr> </table>