A document on a Web server, conforming to the HTML standard, that can be viewed using a Web Browser. Web document developer. A person, or a team of people, that originates Web documents. Web document editor. One of the many software tools available for developing Web document.
Markup languages format documents, and HTML is an example of a markup language.
With some exceptions, HTML styles are functional rather than descriptive. That is, the styles are designed for specific uses, rather than specific appearances. Different Browsers may display or render that emphasis in different manners, such as boldface, italics or colored text. In specific corporate settings which are restricted to internal use only, it may be practical to control which Web Browser employees will use, but in most other settings the Web document developer has no control over which Browser a user will employ. You may warn users that your site is designed for a specific Browser and even Browser version, but you cannot prevent someone from attempting to use a different one.