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《What is Focus? -- 03》
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无障碍方面知识
教程列表：
Introducing A11ycasts! -- A11ycasts #01
What is Focus? -- A11ycasts #03
Controlling focus with tabindex -- A11ycasts #04
Just use button -- A11ycasts #05
Roving tabindex -- A11ycasts #06
Screen Reader Basics: VoiceOver -- #A11ycasts 07