"Reprint" Write runat= "server" What is the use of

The ASPX runtime is compiled with HTML tags that do not have runat= "Server" properties written directly to response, runat= "server " The HTML tag of the property is converted to the corresponding HTMLControl subclass into the control collection of the page, which is processed by the life cycle of a control, which means "running on the server".
One of the most straightforward manifestations is that when you write a id= "abc" DIV, if you have runat= "server" attribute, you can use abc.xxx directly in your Aspx.cs file to manipulate the object without　　runat= "Server" , there is no such object in CS. These are the HTML controls in ASP. asp controls can only runat= "Server"because they are not directly related to HTML

"Reprint" Write runat= "server" What is the use of