This is such an awesome new feature. Oh, so often I would want to save the entire full page when landing on something of interest. These days one prints the full page, not just the screen, or save it as a PDF after selecting print. The end resulting saved PDF often has no resemblance to the actual web page. Now in iOS 13 there is this very neat option to save a full web page as a PDF.
Browse a page in Safari. Have not attempted other browsers.
Take a screenshot. A preview of the captured screen will hover on the bottom left side.
Tap the Full Page tab in the upper right corner of the Markup.
Now tap DONE and then tap the option to save PDF to Files.
Now that is really AWESOME.