Why data-* Attributes Beat CSS Classes for Managing UI State in JavaScript

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A common JavaScript pattern uses CSS class toggles like 'is-open' to manage UI state, but this approach relies on informal team conventions that can break down over time. Because class names share the same namespace as styling hooks, they can be misread, reused, or pulled into unintended specificity conflicts by new contributors. An alternative approach uses HTML data-* attributes, such as 'data-q-active', to represent state directly in the syntax rather than by convention. Unlike class names, data-* attributes carry no styling meaning by default, making their purpose unambiguous and preventing accidental misuse. This separation ensures CSS retains full ownership of appearance while JavaScript strictly manages behavioral state through clearly scoped, purpose-built attributes.

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