A structured lesson workspace with readable content, hands-on examples, and a clean path to completion.
<style>[hidden]{display:none;}</style><main class="demo">Example content</main>
The useful mental model here is practical: how hiding, generated content, order, and display choices can change what assistive technology receives. When a rule looks obvious but the browser produces something else, start by identifying which constraint or rendering phase is actually winning.
A good CSS change narrows the problem. Keep important content in the DOM with semantic relationships, and treat CSS as presentation. This keeps the rule understandable when content, theme, or viewport conditions change later.
<style>.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);}</style><main class="visually-hidden">Example content</main>
Engineering judgment: Keep important content in the DOM with semantic relationships, and treat CSS as presentation.
| Concern | What to inspect | Typical failure |
|---|---|---|
| Core behavior | Styling Without Breaking Screen Readers | Visual order is not a safe substitute for semantic order. |
| Production test | Real content and constraints | The rule works only for the demo values |
| Maintenance | Scope and override path | A later fix creates another exception |
The useful mental model here is practical: how hiding, generated content, order, and display choices can change what assistive technology receives. When a rule looks obvious but the browser produces something else, start by identifying which constraint or rendering phase is actually winning.
<style>.icon::after{content:"";}</style><main class="icon">Example content</main>
Example 3 is useful here because it demonstrates styling without breaking screen readers under a concrete input rather than as an abstract property list.
<style>.nav{display:flex;}</style><main class="demo"><nav><a href="#">Home</a><a href="#">Docs</a></nav></main>
Example 4 is useful here because it demonstrates styling without breaking screen readers under a concrete input rather than as an abstract property list.
Finish the lesson once you have worked through the material. This awards ★ 40 XP.