Accessible Rich Internet Applications (WAI.docx
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1、AccessibleRichInternetApplications(WAIaria-keyshortcuts(property)Indicateskeyboardshortcutsthatanauthorhasimplementedtoactivateorgivefocustoanelement.Thevalueofthearia-keyshortcutsattributeisaspace-delimitedlistofkeyboardshortcutsthatcanbepressedtoactivateacommandortextboxwidget.Thekeysdefinedinthes
2、hortcutsrepresentthephysicalkeyspressedandnottheactualcharactersgenerated.Eachkeyboardshortcutconsistsofoneormoretokensdelimitedbytheplussign(+)representingzeroormoremodifierkeysandexactlyonenon-modifierkeythatmustbepressedsimultaneouslytoactivatethegivenshortcut.AuthorsMUSTspecifymodifierkeysexactl
3、yaccordingtothespec-forexample,Alt,Control,Shift,Meta,orAltGraph.NotethatMetacorrespondstotheCommandkey,andAlttotheOptionkey,onApplecomputers.Thevalidnamesfornon-modifierkeysareanyprintablecharactersuchasA,B,1,2,$,Plusforaplussign,Spaceforthespacebar,orthenamesofanyothernon-modifierkeyspecifiedinthe
4、spec-forexample,Enter,Tab,ArrowRight,PageDown,Escape,orF1.TheuseofSpaceforthespacebarisanexceptiontothespecasthespaceorspacebarkeyisencodedasandwouldbetreatedasawhitespacecharacter.AuthorsMUSTensuremodifierkeyscomefirstwhentheyarepartofakeyboardshortcut.AuthorsMUSTensurethatrequirednon-modifierkeysc
5、omelastwhentheyarepartofashortcut.Theorderofthemodifierkeysisnototherwisesignificant,soAlt+Shift+TandShift+Alt+Tareequivalent,butT+Shift+Altisnotvalidbecauseallofthemodifierkeysdontcomefirst,andAltisnotvalidbecauseitdoesntincludeatleastonenon-modifierkey.Whenspecifyinganalphabetickey,boththeuppercas
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