HTML (HyperText Markup Language) is the lingua franca of the Web.
An HTML file has a document type that specifies which version of the HTML language specification the file conforms to. The file declares its document type using a
<!DOCTYPE … > declaration that appears at the top of the file.
TypeMetal can create and edit documents in all of the recent HTML document types:
TypeMetal recognizes these standard filename extensions for HTML and XHTML files:
Additionally, TypeMetal recognizes XHTML files that have any of the following filename extensions:
Note that “.xml” is a very broad, general file type specification: Not all .xml files contain XHTML.
TypeMetal can open and edit “.xml” files whose content is a properly structured (or fixable) XHTML document, but it is not suitable for editing other types of XML files.