<?xml version="1.0" encoding="utf-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1 plus MathML 2.0 plus SVG 1.1//EN" "http://www.w3.org/2002/04/xhtml-math-svg/xhtml-math-svg.dtd"> <html xmlns:svg='http://www.w3.org/2000/svg' xml:lang='en' xmlns='http://www.w3.org/1999/xhtml'> <head><meta content='application/xhtml+xml;charset=utf-8' http-equiv='Content-type' /><title></title></head> <body> <h2 id='header1'>Header with attributes</h2> <h3 id='header2'>Header with attributes</h3> <h3 id='header_no_attributes'>Header no attributes</h3> <p id='par1'>Paragraph with a.</p> <p id='par2'>Paragraph with <em class='chello'>emphasis</em></p> </body></html>