Q. How do you cite an article from the web using MLA 8 formatting?

According to MLA 8th edition, you will cite an article from the web inside your paper (in text citation) using either the author, or the title of the article. It depends on whether an author a person or an organization. For example, if you are citing an article you located on the Library of Congress's website that is written by someone at the Library of Congress, you would use the name of the article first. 

EXAMPLE with an author that is considered to be an organization: Brief History of the National Parks. Lib. of Cong. N.p., n.d. Web. 27 Jan. 2016. <http://www.loc.gov/collection/national-parks-maps/special-presentation/>.

EXAMPLE with an author who is a person, but that was located on a website: Keller, Helen. “Letter to John Hitz 29 Aug. 1893.” 1893. TS. Lib. of Cong., Washington, D.C. Lib. of Cong. Web. 27 Jan. 2016. <http://www.loc.gov/item/magbellbib004020>.

For more information see pages 54-56 in the MLA handbook.