xxxxxxxxxx<html> <body> <h1>Sub element examples</h1> <h2>Math Forumulas:</h2> <p>The coordinate of the <var>i</var>th point is (<var>x<sub><var>i</var></sub></var>, <var>y<sub><var>i</var></sub></var>). <h2>Chemical Forumula:</h2> <p>H<sub>2</sub>O</p> <h2>Abbreviations:</h2> <p>Their names are <span lang="fr"><abbr>M<sup>lle</sup></abbr> Gwendoline</span> and <span lang="fr"><abbr>M<sup>me</sup></abbr> Denise</span>. </p> </body></html>