HTML data-* Attributes
Attach declarative behavior or metadata without invalid custom attributes.
What this solves
Mark elements for a JavaScript tool controller. This pattern is useful when the business question is clear but a generic tutorial is too abstract.
The rule
Use data-name attributes and access them through dataset.
<button data-run-tool>Run</button>Real-work checklist
- Define the business key and expected grain before writing the formula, query or markup.
- Test the pattern on a small known sample where you can verify the answer manually.
- Check missing values, duplicates and data types before trusting a large result.
- Scale to the real file or database only after the logic is proven.
Common mistake
Do not store sensitive data in the DOM just because data-* is convenient.