This file is used to host web application in Windows Azure. Let us open default.aspx and modify it as below, I have deleted all the default codes from MainContent and put one H1 tag as below.

Call it low-code for the web: Azure Static Web Apps has reached general availability, providing a quick onramp to full-stack projects with static front ends and dynamic back ends powered by Azure ...

Two cloud development services -- Azure Functions and Azure App Service -- are now available on Azure Stack, which brings cloud functionality to on-premises, hybrid implementations.

Microsoft is combining Azure Websites, Mobile Services and BizTalk Services into a new bundle for developers building all kinds of cross-platform apps.