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{{Short description|Electronic document with fluid layout}}
{{Use dmy dates|date=DecemberMarch 20122023}}
[[File:Reflowable Texttext.pngsvg|thumb|400px350px|Example of reflowable text]]
 
A '''reflowable document''' is a type of [[electronic document]] that can adapt its [[presentation]] to the [[output device]]. Typical [[prepress]] or fixed page size output formats like [[PostScript]] or [[Portable Document Format|PDF]] are not reflowable during the actual printing process because the page is not resized. For [[end user]]s, the [[World Wide Web]] standard, [[HTML]] is a reflowable format<ref name=parc>{{Cite book|publisher=World Scientific Publishing Co. Pte. Ltd.|isbn=981-238-582-7|year=2003|url=httphttps://books.google.com/books?id=ubs2mwNlHnEC&pg=PA93|page=93|title=Web Document Analysis|editor-first1=Apostolos |editor-last1=Antonacopoulus and |editor-first2=Jianying |editor-last2=Hu|author1first1=T.M. |last1=Breuel, |first2=W.C. |last2=Janssen, |first3=K. |last3=Popat, |first4=H.S. |last4=Baired}}</ref> as is the case with any resizable [[electronic page]] format.
 
In contrast to end user terminology, the notion of reflow is sometimes used to discuss [[desktop publishing]] program features for [[printing|print]] publication [[page layout]] such as automatically balancing the amount of text in a number of columns.<ref name=ms/>
 
Reflow is not limited to text; 21st century [[scorewriter]]s enable music notation to be reflowed between systems and pages in a similar way to how text reflows between lines and pages.
 
== Examples ==
Besides HTML, commercially available systems include:
* [[ePUBEPUB]] is a simple reflowable format that allows a single column with [[inline image]]s, in many ways similar to a stripped-down HTML.<ref>{{Cite book|page=501|first=Pariah S.|last=Burke|url=httphttps://books.google.com/books?id=D1DEKszFm6gC&pg=PA501|title=Mastering InDesign CS5 for print design and production|year=2011|publisher=Wiley Publishing, Inc.|isbn=978-0-470-65098-1}}</ref>
* [[Windows Presentation Foundation]] (WPF) introduced [[XAML]]-based documents together with a viewer call "SinglePageViewer" that can reflow any WPF objects. However the [[Open XML Paper Specification|XPS]] document standard also introduced by Microsoft with WPF does not support reflow.<ref name=ms>{{Cite web|url=http://msdn.microsoft.com/en-us/library/aa480192.aspx|accessdateaccess-date=2 December 2012|title=An Introduction to Windows Presentation Foundation|work=[[MSDN]]|publisher=[[Microsoft]]|first1=David F.|last1=Sklar|first2=Andy|last2=van Dam|date=September 2005}}</ref>
* Tagged [[PDF]] documents can contain an additional data layer that (among other things) allows content to reflow within the boundaries of one original page.<ref>{{Cite book|url=httphttps://books.google.com/books?id=dlJ94KZqwqcC&pg=PA379|isbn=978-1-59059-638-8|title=Web accessibility : web standards and regulatory compliance|first=Michael R.|last=Burks|year=2006|page=379|publisher=Apress }}</ref><ref>{{Cite web|accessdateaccess-date=2 December 2012|url=http://www.adobe.com/uk/epaper/tips/acr5reflow/pdfs/acr5reflow.pdf|format=PDF|publisher=[[Adobe Systems]]|title=Reflow the contents of Adobe PDF documents|archive-url=https://web.archive.org/web/20120312080826/http://www.adobe.com/uk/epaper/tips/acr5reflow/pdfs/acr5reflow.pdf|archive-date=2012-03-12}}</ref>
* [[FictionBook]] is a free reflowable format by design. It does not specify the appearance of a document; instead, it describes its structure. For example, there are special tags for epigraphs, verses and quotations.
* [[Amazon (company)|Amazon]]'s [[Kindle File Format]], but only in its newest version.<ref>{{cite web| url=https://kdp.amazon.com/en_US/help/topic/GULSQMHU5MNH4EZM|title=MOBI Support for Reflowable eBooks Frequently Asked Questions| publisher=Amazon| accessdate=2022-05-04}}</ref>
 
[[Xerox PARC]] has developed an experimental system that allows the reflow of any document using [[Optical character recognition|OCR]] layout analysis at word-level.<ref name=parc/>
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