A structured lesson workspace with readable content, hands-on examples, and a clean path to completion.
<style>.demo { color:#334155; background:#fff; }</style><main class="demo">Example content</main>
In production, A color pair that passes one design state can fail in hover, disabled, or dark-theme variants. That is the kind of bug that survives visual spot checks because the stylesheet is syntactically valid while the layout contract is wrong.
| Concern | What to inspect | Typical failure |
|---|---|---|
| Core behavior | Accessible Color Contrast and Visual Design | A color pair that passes one design state can fail in hover, disabled, or dark-theme variants. |
| 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 contrast, non-color cues, and visual hierarchy affect perception and usability. When a rule looks obvious but the browser produces something else, start by identifying which constraint or rendering phase is actually winning.
<style>a{text-decoration:underline;}</style><main class="demo"><a href="#">Example link</a></main>
Engineering judgment: Audit complete states, not just the default palette.
In production, A color pair that passes one design state can fail in hover, disabled, or dark-theme variants. That is the kind of bug that survives visual spot checks because the stylesheet is syntactically valid while the layout contract is wrong.
<style>.status::before{content:"";}</style><main class="status">Example content</main>
Example 3 is useful here because it demonstrates accessible color contrast and visual design under a concrete input rather than as an abstract property list.
<style>.icon-text{display:inline-flex;gap:.5rem;}</style><main class="icon-text">Example content</main>
Example 4 is useful here because it demonstrates accessible color contrast and visual design 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.