You can view the HTML panorama viewer (it is still feature-incomplete at this point) by downloading desktop Safari, enabling the Developer menu by clicking 'Edit' > 'Preferences' > 'Advanced' > 'Enable Develop menu' and then using the 'Develop' menu to switch Safari's User Agent to that of the iPhone's or iPad's. Note that, unlike other browsers, this will only switch the user agent for the page you are on in the tab you have open, so you should be on the page before switching user agents. Once you have the viewer up, you can view its source code, however as I said above, it is still feature-incomplete (e.g. no 'Share' link camera coordinate support, no highlights, no loading of higher resolutions, no opening of photosynths, no HTML viewer for embedded panoramas, etc.).