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Web applications\u2019 interfaces are becoming more and more interactive. However, these changes are severely impacting how disabled users interact through assistive technologies with the web. In order to deploy an accessible web application, developers can use WAI-ARIA to design an accessible web application, which manually implements focus and keyboard navigation mechanisms. This article presents a quantitative metric, named Fona, which measures how the Focus Navigation WAI-ARIA requirement has been implemented on the web. Fona counts JavaScript mouse event listeners, HTML elements with role attributes, and TabIndex attributes in the DOM structure of webpages. Fona\u2019s evaluation approach provides a narrow analysis of one single accessibility requirement. But it enables monitoring this accessibility requirement in a large number of webpages. This monitoring activity might be used to give insights about how Focus Navigation and ARIA requirements have been considered by web development teams. Fona is validated comparing the results of a set of WAI-ARIA conformant implementations and a set of webpages formed by Alexa\u2019s 349 top most popular websites. The analysis of Fona\u2019s value for Alexa\u2019s websites highlights that many websites still lack the implementation of Focus Navigation through their JavaScript interactive content.<\/jats:p>","DOI":"10.1145\/2812812","type":"journal-article","created":{"date-parts":[[2015,9,29]],"date-time":"2015-09-29T19:22:29Z","timestamp":1443554549000},"page":"1-28","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":9,"title":["Fona"],"prefix":"10.1145","volume":"9","author":[{"given":"Willian Massami","family":"Watanabe","sequence":"first","affiliation":[{"name":"UTFPR - Universidade Tecnol\u00f3gica Federal do Paran\u00e1, Brazil"}]},{"given":"Ana Luiza","family":"Dias","sequence":"additional","affiliation":[{"name":"ICMC-USP - Instituto de Ci\u00eancias Matem\u00e1ticas e de Computa\u00e7\u00e3o da Universidade de S\u00e3o Paulo, Brazil"}]},{"given":"Renata Pontin De Mattos","family":"Fortes","sequence":"additional","affiliation":[{"name":"ICMC-USP - Instituto de Ci\u00eancias Matem\u00e1ticas e de Computa\u00e7\u00e3o da Universidade de S\u00e3o Paulo, Brazil"}]}],"member":"320","published-online":{"date-parts":[[2015,9,24]]},"reference":[{"key":"e_1_2_1_1_1","doi-asserted-by":"publisher","DOI":"10.1007\/11788713_28"},{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1145\/1243441.1243463"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.advengsoft.2012.11.004"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1145\/2207016.2207019"},{"key":"e_1_2_1_5_1","doi-asserted-by":"publisher","DOI":"10.1145\/1969289.1969295"},{"key":"e_1_2_1_6_1","doi-asserted-by":"publisher","DOI":"10.1145\/1734200.1734204"},{"key":"e_1_2_1_7_1","doi-asserted-by":"publisher","DOI":"10.1145\/1363686.1364259"},{"key":"e_1_2_1_8_1","doi-asserted-by":"publisher","DOI":"10.1145\/1456536.1456551"},{"key":"e_1_2_1_9_1","doi-asserted-by":"publisher","DOI":"10.1145\/1297144.1297177"},{"key":"e_1_2_1_10_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-642-02713-0_70"},{"key":"e_1_2_1_11_1","doi-asserted-by":"publisher","DOI":"10.1080\/13614560802624241"},{"key":"e_1_2_1_12_1","volume-title":"Ajax: A New Approach to Web Applications. 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Specialized documents. In Web Accessibility (Human-Computer Interaction Series), Vol. 4 . Springer , London, 274--285. DOI:http:\/\/dx.doi.org\/10.1007\/978-1-84800-050-6_16 10.1007\/978-1-84800-050-6_16 Ethan V. Munson and Maria da Gra\u00e7a Pimentel. 2008. Specialized documents. In Web Accessibility (Human-Computer Interaction Series), Vol. 4. Springer, London, 274--285. DOI:http:\/\/dx.doi.org\/10.1007\/978-1-84800-050-6_16"},{"key":"e_1_2_1_20_1","doi-asserted-by":"publisher","DOI":"10.1002\/asi.20233"},{"key":"e_1_2_1_21_1","doi-asserted-by":"publisher","DOI":"10.1145\/1368044.1368069"},{"key":"e_1_2_1_22_1","doi-asserted-by":"publisher","DOI":"10.1145\/355460.355549"},{"key":"e_1_2_1_23_1","volume-title":"Universal Access in Human-Computer Interaction","author":"Tateishi Takaaki","unstructured":"Takaaki Tateishi , Hisashi Miyashita , Tabuchi Naoshi , Shin Saito , and Kouichi Ono . 2007. DHTML accessibility checking based on static javascript analysis . 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