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HTML Application could be recovered as HTML codes. Saving the page as HTML could give us an insight about the structure.
An HTML conversion application helps to convert HTML pages into other formats. You can do this by exporting JS also.
In structure <?php ?> <html> </html> in application - one is static and another is dynamic.
this much ......
HTML was originally developed as an application inside SGML, but the first official version was HTML 2.0
HTML is read by a browser and a browser works at the Application Layer.