How to fix this kind of problem?
问题 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>test</title> </head> <body> <br /><br /><br /> <div style="line-height:150%"> <span style="display:block;font-size:240%;">test</span> </div> </body> </html> First double click on the text test ,then it's highlighted, then you can see via firebug