<html><head><style type="text/css">h1, h2, h3, h4, h5, h6 {color:blue;}</style></head><body><h1>这是 heading 1</h1><h2>这是 heading 2</h2><h3>这是 heading 3</h3><h4>这是 heading 4</h4><h5>这是 heading 5</h5><h6>这是 heading 6</h6></body></html>