The overarching principle is that a reader should be able to take a URL published or displayed, type it into a browser, and get to the intended web page. All URLs should be tested before they are published.
Use http:// or https:// to assist in accessing websites on mobile devices.
Use www and the final slash (/) in an address if they are necessary to access the page. If a person can get to the intended page without typing in www or the final slash, do not use them: wustl.edu; NOT www.wustl.edu. .htm and .html usually are not necessary; check the address and include .htm or .html if necessary to access the page.
Domain names are not case-sensitive and always should be lowercased. Letters after the domain name are case-sensitive and may need to be uppercased. Use lowercase whenever possible.
When using text to serve as a clickable link, use text description of the link’s destination whenever possible. Avoid “click here” whenever possible. When clickable text is used (and the URL is hidden to the user), make sure the link is to the full URL, including “http” through the final slash. Examples: For more information, visit PLAN website.
See Web, the.