Running and debugging HTML applications is possible with the Angular CLI toolchain's standard tools.
For example, you can use the ng serve qer-app-portal command to debug the Web Portal HTML application.
To debug an HTML application
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Host the API Server locally (see Hosting API Servers locally). 
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Start a command line program. 
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Change to the Angular workspace directory. 
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Run the following command: npm run start <HTML application> This starts a web server that is accessible by default under http://localhost:4200 and hosts the HTML application. 
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Start debugging in an appropriate development environment (for example, Visual Studio Code). 
