XHTML is a stricter version of HTML, which is XML-based. This means you can load an XHTML page in an XML object without any failures. Many web pages that you found on the Internet are XHTML and a big part of them are minified. With an XHTML code formatter, you can beautify the page and make it human-readable.
Indentation of your code will make it easy to follow. Each block element will be placed on a new line because we know this is what you expect.