After saving a presentation as a Web page, you can open the Web page, an HTML file, in PowerPoint. This allows you to quickly and easily switch from HTML to the standard PowerPoint format and back again without losing any formatting or functionality. For example, if you create a formatted chart in a PowerPoint presentation, save the presentation file as a Web page, and then reopen the Web page in PowerPoint, the chart will look the same as the original chart in PowerPoint. PowerPoint preserves the original formatting and functionality of the presentation.
Open a Presentation as a Web Page in PowerPoint