單頁式應用中的無障礙設計

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1 Accessibility in SPA

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2 / Kalan Frontend Engineer @LINE Fukuoka Twitter: @kalanyei Blog: blog.kalan.dev Github: kjj6198 Facebook Svelte.js Taiwan

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3 Accessibility in SPA

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Agenda 4 WCAG / WAI-ARIA UI

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Accessibility 5 Web Content Accessibility Guideline

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Story Time 6

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Story Time 7 jason-memo.dev/posts/prefer-tab-over-space-for-a11y/

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Story Time 8 https://chrome.google.com/webstore/detail/vimium/dbepggeogbaibhgnhhndojpepiihcmeb

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9 W3C

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10 W3C

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11 W3C

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WCAG: Web Content Accessbility Guidelines How to meet WCAG 12 P   erceivable O   perable U   nderstandable R   obust

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13 Windows Narrator MacOS iOS VoiceOver Android TalkBack

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Demo 15

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WCAG 16 https://www.w3.org/WAI/WCAG21/quickref https://www.w3.org/TR/WCAG21

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18 20 1 🇯🇵

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19 🇺🇸

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20 🇹🇼 119.8 5.1%

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24 aria role WAI-ARIA

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ARIA (Accessible Rich Internet Applications) HTML aria roles 25 aria-label aria-labelledby aria-haspopup aria-expanded aria-modal aria-valuenow aria-posinset aria-describedby aria-labelledby combobox

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26 - ARIA

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ARIA 27 UI HTML tag UI

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button =

+ onclick 28

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29 input button a tabindex=0 tabindex=-1

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id 32

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aria-label aria-describedby 33

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aria-label aria-describedby 37

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modal 40

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overlay ESC modal modal modal body 41 Try to use it via screen reader

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42 Bad👎

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43 Good👍

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combobox 44

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47 1. 2. enter 3.

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1. role combobox 2. aria-haspopup aria-expanded 3. aria-controls 4. role listbox 5. role option 6. aria-selected true 49

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Google 50 d

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downshift 51 You need an autocomplete, a combobox or a select experience in your application and you want it to be accessible. You also want it to be simple and fl exible to account for your use cases. Finally, it should follow the ARIA design pattern for a combobox or a select, depending on your use case.

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Tab 52

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1. 2. 3. tablist tab tabpanel UI 4. tabindex="-1" aria-selected="false" tab 53

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56 1. role slider 2. 3. tabindex 4. aria-valuemin aria-valuemax aria-valuenow 5. aria-valuetext 6. aria-orientation

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YouTube 58

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Live Region - 59

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role="status" aria-live="polite" role="alert" aria-live="assertive" + aria-atomic="true" 61

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Real Time Notification 62

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Client Side Routing 70

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gatsby - announcer popstate URL 71

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@reach/ui 72 https://reach.tech/

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73 WCAG alt tag button, a e.g

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Dev Tool - Edge 74

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UI 76 MDN https://developer.mozilla.org/en-US/docs/Web/Accessibility

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77 30 0 1 Svelte UI Day12 ~ Day20 UI

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UI 78 https://www.w3.org/WAI/ARIA/apg/patterns/

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79 相

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POUR WCAG 80