Dot-com

Use a hyphen.

Em-dashes

On Web pages, em-dashes should not be closed up to surrounding text. Put a space before and after the em-dash for better text flow.

Email

Do not hyphenate.

Home page

Not homepage.

Internet

Use this capitalization.

Login

Together, as one word, “login” is a noun:

My login is my email address.

Log in

Space the words apart for verb use:

I am already logged in.

Net, the (in reference to the Internet)

Online

Not on-line or on line.

Podcast

Do not hyphenate.

URLs and email addresses

Unless at the beginning of a sentence, an email address should be set in lowercase letters with no spaces between elements:

jdoe@upenn.edu

When citing a URL or email address in running text, do not enclose in angle brackets. The use of “http://” at the beginning of a URL is not necessary if the address uses www:

www.upenn.edu
http://knowledgelink.upenn.edu

Never break a URL at the end of a line:

For more information about a bunch of things, see the Penn Medicine giving blog,
http://penn-medicine-giving.blogspot.com/

World Wide Web

Note capitalization.

Web, the (in reference to the World Wide Web)

Note capitalization. It is capitalized because it is a title that refers to a rule set. (“Internet” is capitalized because it is a location, a proper noun.

Web browser, Web feed, Web page

Note capitalization.

Webcast, Website, Webmaster

Note capitalization.