2.2 版新增内容：焦点外观与目标尺寸
应用最新版本新增的成功准则。
2.2 版新增内容：焦点外观与目标尺寸 是 CoddyKit 上的免费 Web Accessibility Academy 课时。 这是第 2 节课，共 4 节。 你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。 这是 Web Accessibility Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Web Accessibility Academy 课程共包含 4 节课。
本课时的部分内容尚未翻译，以英文显示。
What 2.2 Brought
WCAG 2.2 added nine new success criteria in 2023. Two of the most practical for everyday UI are Focus Appearance and Target Size.
Focus Not Obscured
New rule 2.4.11 (Focus Not Obscured) at AA says the focused element must not be fully hidden behind sticky headers or cookie bars.
Why Hidden Focus Hurts
If a sticky banner covers the focused control, keyboard users lose track of where they are. They must see the item they just tabbed to.
Focus Appearance at AAA
Criterion 2.4.13 (Focus Appearance) is AAA. It specifies a minimum indicator area and 3:1 contrast so the focus ring is unmistakable.
Target Size (Minimum)
The AA rule 2.5.8 (Target Size Minimum) asks that tap targets be at least 24 by 24 CSS pixels, or have enough spacing around them.
Why 24 Pixels
Small targets are hard for people with tremors or large fingers. A 24px floor cuts mis-taps without forcing a chunky design everywhere.
The Spacing Exception
A target under 24px can still pass if a 24px circle around its center does not overlap a neighbor. Spacing buys back the size.
Sizing a Target in CSS
Give small buttons a real minimum size so they comfortably clear the 24px floor.
button {
min-width: 24px;
min-height: 24px;
}Inline Links Are Exempt
Links inside a sentence are exempt from 2.5.8, since shrinking text just to enlarge them would harm the reading experience.
Consistent Help: 3.2.6
Another 2.2 add, 3.2.6 (Consistent Help) at A, keeps help links and contact info in the same relative spot across pages.
Redundant Entry: 3.3.7
Criterion 3.3.7 (Redundant Entry) at A says do not make users re-type info they already gave, unless it is essential like a password.
Quick Check
Recall the minimum touch target size from WCAG 2.2.
Recap: The 2.2 Additions
2.2 added focus and target rules: keep focus visible, make targets 24px or well spaced, and stop redundant entry. Next: dragging and authentication. 🎯
常见问题解答
「2.2 版新增内容：焦点外观与目标尺寸」课时是免费的吗？
是的 — 「2.2 版新增内容：焦点外观与目标尺寸」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Web Accessibility Academy 课程的其余内容，请升级到 CoddyKit PRO。 Web Accessibility Academy 课程共包含 4 节课。
「2.2 版新增内容：焦点外观与目标尺寸」这节课中我会学到什么？
应用最新版本新增的成功准则。 你通过在浏览器中直接运行的动手代码来练习 Web Accessibility Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。
学习 Web Accessibility Academy 需要有经验吗？
无需任何先前经验。CoddyKit 上的 Web Accessibility Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。 这是第 2 节课，共 4 节。
「2.2 版新增内容：焦点外观与目标尺寸」课时需要多长时间？
大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。
我能在这节 Web Accessibility Academy 课中编写并运行代码吗？
能。每节 Web Accessibility Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。
此课程中的所有课时
- A、AA、AAA：选择正确的目标
- 2.2 版新增内容：焦点外观与目标尺寸
- 拖拽操作与无障碍身份验证
- 编写有据可依的一致性声明