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deepmind.google·6d ago
AI Engineering
Lobsters·Sep 5·5 min read
Controlling when CSS custom property values are computed
TL;DR
CSS custom properties can yield unexpected results based on when and how their values are computed, significantly affecting styling. Understanding the timing of these computations is crucial for accurate design implementation.
✦ Why It Matters
Register custom properties with specific syntax to ensure predictable styling outcomes in your CSS.
Key Takeaways
- Register custom properties to control value computation timing.
- Use specific syntax to avoid unexpected styling results.
- Understand sibling-index() behavior for accurate scaling.
- Be aware of URL resolution differences in CSS.
How It Works
CSS custom properties are computed based on their context. When a property is registered with a specific syntax, it computes its value earlier, leading to more predictable results.
For instance, using sibling-index() in a parent and referencing it in a child can yield different values depending on whether the property is registered or not.