[Accessibility.Handbook(2012.8)].Katie.Cunningham.文字版

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1、AccessibilityHandbookMaking508WebsitesforEveryoneKatieCunninghamBeijing•Cambridge•Farnham•Köln•Sebastopol•TokyoAccessibilityHandbookbyKatieCunninghamCopyright©2012KatieCunningham.Allrightsreserved.PrintedintheUnitedStatesofAmerica.PublishedbyO’ReillyMedia,Inc.,1005GravensteinHighwayNorth,Sebas

2、topol,CA95472.O’Reillybooksmaybepurchasedforeducational,business,orsalespromotionaluse.Onlineeditionsarealsoavailableformosttitles(http://my.safaribooksonline.com).Formoreinformation,contactourcorporate/institutionalsalesdepartment:800-998-9938orcorporate@oreilly.com.Editors:JulieSteeleandMegh

3、anBlanchetteCoverDesigner:KarenMontgomeryProductionEditor:RachelSteelyInteriorDesigner:DavidFutatoProofreader:MelanieYarbroughIllustrators:RobertRomanoandRebeccaDemarestRevisionHistoryfortheFirstEdition:2012-08-24FirstreleaseSeehttp://oreilly.com/catalog/errata.csp?isbn=9781449322854forrelease

4、details.NutshellHandbook,theNutshellHandbooklogo,andtheO’ReillylogoareregisteredtrademarksofO’ReillyMedia,Inc.AccessibilityHandbook:Making508WebsitesforEveryone,thecoverimageofawillowptarmigan,andrelatedtradedressaretrademarksofO’ReillyMedia,Inc.Manyofthedesignationsusedbymanufacturersandselle

5、rstodistinguishtheirproductsareclaimedastrademarks.Wherethosedesignationsappearinthisbook,andO’ReillyMedia,Inc.,wasawareofatrademarkclaim,thedesignationshavebeenprintedincapsorinitialcaps.Whileeveryprecautionhasbeentakeninthepreparationofthisbook,thepublisherandauthorsassumenoresponsibilityfor

6、errorsoromissions,orfordamagesresultingfromtheuseoftheinformationcon-tainedherein.ISBN:978-1-449-32285-4[LSI]1345825037TableofContentsPreface.....................................................................vii1.CompleteBlindness.....................................................1Definiti

7、on1Annoyances,inBrief2ScreenReaders2CreatingAccessibleSites3HTMLandFormatting3WAI-ARIA23Testing272.VisualAccessibility—OtherTypes........................................29LowVision29Annoyances29GrowGracefully29Contrast30Overrides31Forms