<html><head></head><body> <div align=center> <div style="width:1100px;height:40px;border:2px solid red;">11111111111111111111</div> <div style="float:left;width:200px;height:40px;border:2px solid red;">222</div> <div style="float:left;width:200px;height:40px;border:2px solid red;">333</div> <div style="float:left;width:700px;height:40px;border:2px solid red;">444</div> </div></body></html>
<!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>无标题文档</title><style>.cf:after{content:'';display:block;clear:both;}.cf{zoom:1;}.f{margin:0 auto; width:1112px;}</style></head><body> <div class="box"> <div style="width:1100px;height:40px;border:2px solid red;margin:0 auto;">11111111111111111111</div> <div class="f cf"> <div style="float:left;width:200px;height:40px;border:2px solid red;">222</div> <div style="float:left;width:200px;height:40px;border:2px solid red;">333</div> <div style="float:left;width:700px;height:40px;border:2px solid red;">444</div> </div> </div></body></html> Because all three divs below you use float processing.
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