Editing Paper size (section)

==== Common American loose sizes<span class="anchor" id="Letter"></span><span class="anchor" id="Legal"></span><span class="anchor" id="Ledger"></span><span class="anchor" id="Tabloid"></span><span class="anchor" id="American Quarto"></span>====
''Letter, Legal'' and ''Ledger/Tabloid'' are by far the most commonly used of these for everyday activities, and the only North American paper sizes included in [[Cascading Style Sheets]] (CSS).<ref name="mozilla.org"/>

The origins of the exact dimensions of Letter size paper are lost in tradition and not well documented. The American Forest and Paper Association argues that the dimension originates from the days of manual papermaking and that the 11-inch length of the page is about a quarter of "the average maximum stretch of an experienced vatman's arms."<ref name="US">{{cite web |url=http://www.afandpa.org/paper.aspx?id=511 |title=Why is the standard paper size in the U.S. 8 1/2" x 11"? |access-date=4 August 2009 |publisher=American Forest and Paper Association |url-status=dead |archive-url=https://web.archive.org/web/20120220192919/http://www.afandpa.org/paper.aspx?id=511 |archive-date=20 February 2012}}</ref> However, this does not explain the width or aspect ratio.

Outside of North America, Letter size may also be known as "American Quarto".<ref>{{cite web |url=http://www.dimensionsguide.com/junior-legal-paper-size/ |title=Junior Legal Paper Size |publisher=Dimensions Guide |access-date=21 February 2010 |url-status=dead |archive-url=https://web.archive.org/web/20100704081857/http://www.dimensionsguide.com/junior-legal-paper-size/ |archive-date=4 July 2010}}</ref> If one accepts some trimming, the size is indeed one quarter of the old Imperial paper size known as Demy, {{convert|17+1/2|×|22+1/2|inch|mm|0|abbr=on}}.<ref>{{cite book |author-last=Fyffe |author-first=Charles |title=Basic Copyfitting |publisher=Studio Vista |date=1969 |location=London |isbn=978-0-289-79705-1 |page=74}}</ref>

Manufacturers of computer printers, however, recognize inch-based ''Quarto'' as {{frac|10|5|6}} or {{cvt|10.83|inch|mm}} long.<ref name="PWG"/>