Allows the page to be almost displayed without refreshing

HTML in aspx Code Add a piece of code
Original code Before change
< Head >
< Title > Webform1 </ Title >
< Meta Name = "Generator" Content = "Microsoft Visual Studio. net7.1" >
< Meta Name = "Code_language" Content = "C #" >
< Meta Name = "Vs_defaultclientscript" Content = "JavaScript" >
< Meta Name = "Vs_targetschema" Content = "Http://schemas.microsoft.com/intellisense/ie5" >
</ Head >

Changed code After modification
< Head >
< Title > Webform1 </ Title >
< Meta Name = "Generator" Content = "Microsoft Visual Studio. net7.1" >
< Meta Name = "Code_language" Content = "C #" >
< Meta Name = "Vs_defaultclientscript" Content = "JavaScript" >
< Meta Name = "Vs_targetschema" Content = "Http://schemas.microsoft.com/intellisense/ie5" >
< Meta HTTP-equiv = "Page-Enter" Content = "Revealtrans (duration= 0.3, transition = 5 )" >
</ Head >

Actually, the webpage access method is changed when the webpage is opened.