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| Concern | What to inspect | Typical failure |
|---|---|---|
| Core behavior | CSS Transitions and Timing Functions | Not every property interpolates in a visually meaningful way. A transition can technically run while producing a jump because the values are discrete or the intermediate rendering is not useful. |
| 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 |
A good CSS change narrows the problem. Keep transitions short and purpose-driven. Use timing functions to tune the feel, not to hide a slow interaction. This keeps the rule understandable when content, theme, or viewport conditions change later.
<style>.demo { transition:opacity .2s ease; }</style><main class="demo">Example content</main>
In production, Not every property interpolates in a visually meaningful way. A transition can technically run while producing a jump because the values are discrete or the intermediate rendering is not useful. That is the kind of bug that survives visual spot checks because the stylesheet is syntactically valid while the layout contract is wrong.
<style>.demo { transition:background-color .18s linear; }</style><main class="demo">Example content</main>
Engineering judgment: Keep transitions short and purpose-driven. Use timing functions to tune the feel, not to hide a slow interaction.
In production, Not every property interpolates in a visually meaningful way. A transition can technically run while producing a jump because the values are discrete or the intermediate rendering is not useful. That is the kind of bug that survives visual spot checks because the stylesheet is syntactically valid while the layout contract is wrong.
<style>.demo { transition:transform .2s ease, opacity .2s ease; }</style><main class="demo">Example content</main>
Multiple properties is useful here because it demonstrates css transitions and timing functions under a concrete input rather than as an abstract property list.
<style>.card { transition:transform .2s ease; }</style><main class="card">Example content</main>
No-transition state is useful here because it demonstrates css transitions and timing functions under a concrete input rather than as an abstract property list.
Finish the lesson once you have worked through the material. This awards ★ 30 XP.