Platform provided behaviors feedback 9#1293
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anaskim wants to merge 4 commits intoMicrosoftEdge:mainfrom
Open
Platform provided behaviors feedback 9#1293anaskim wants to merge 4 commits intoMicrosoftEdge:mainfrom
anaskim wants to merge 4 commits intoMicrosoftEdge:mainfrom
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dandclark
reviewed
Apr 2, 2026
| this._tooltipBehavior.content = 'Helpful tooltip text'; | ||
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| #### Alternative 1: Class references |
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Can we keep this but move it to the "Alternatives considered" section towards the end of the document?
| **Cons:** | ||
| - Requires developers to manage behavior instances themselves. | ||
| - More setup code compared to passing class references directly. | ||
| With the current approach, developers hold direct references to their behavior instances: no array lookup, `instanceof` checks, or `behaviors` interface is needed to access behavior state. It also aligns with the [W3C design principle that classes should have constructors](https://www.w3.org/TR/design-principles/#constructors) that allow authors to create and configure instances, and it extends naturally to future developer-defined behaviors that follow the same `new` + attach pattern. |
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Suggested change
| With the current approach, developers hold direct references to their behavior instances: no array lookup, `instanceof` checks, or `behaviors` interface is needed to access behavior state. It also aligns with the [W3C design principle that classes should have constructors](https://www.w3.org/TR/design-principles/#constructors) that allow authors to create and configure instances, and it extends naturally to future developer-defined behaviors that follow the same `new` + attach pattern. | |
| Developers hold direct references to their behavior instances. This aligns with the [W3C design principle that classes should have constructors](https://www.w3.org/TR/design-principles/#constructors) that allow authors to create and configure instances, and it extends naturally to future developer-defined behaviors that follow the same `new` + attach pattern. |
Suggested rewording now that the "class references" alternative is no longer being directly compared to this approach.
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| *Note: Automatic exposure would require adding behavior properties (e.g., `formAction`, `name`, `value`) to `HTMLElement`. This would bloat every `HTMLElement` instance's prototype with properties that only make sense for elements with specific behaviors. An opt-in alternative was considered but adds API complexity without a clear benefit.* |
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I don't think we need to include this note here if we instead keep the Class References alternative section and move it to Considered Alternatives near the end of the doc per my other suggestion.
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