In a Single Page Application, the container is the object in which the application is initially loaded and displayed to the user. This concept is different from that of a software container, which is an isolated environment that an application lives in, much like a virtual machine.
For a single page web application, the container could be the
<body> element, or any element within the
<body> element. For instance, you may have some static welcome text initially loaded on the page in a
<p> element, and the SPA will then load dynamically below that element in a
<!doctype html> <html> <body> <p>This is some welcome text.</p> <div class="container"> The application will be loaded here. </div> </body> ...