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Required Properties with Default Values
For issue #787 this is a list of all required properties that have default values defined
Meta comment: Joanie questions if we want to maintain the fallback/error-correction information in the Core AAM. The Core AAM (Accessibility API Mappings) tells implementors how to expose roles, states, and properties for each accessibility API. If an author makes the error of failing to provide a value for a required property, the corrective measures taken by the user agent (e.g. exposing "2" as the level of a heading without an aria-level) are independent of the Accessibility API. Things that have nothing to do with Accessibility API mappings do not belong, in her opinion, in an Accessibility API Mappings spec. An alternative solution would be to add a new section to the ARIA spec stating what user agents should do to correct for missing values of required properties.
| Role | State/Property | Current Default Value | Notes |
|---|---|---|---|
| checkbox | aria-checked | false | Required. Default in Core AAM Default Values Table only. |
| combobox | aria-expanded | false | Required. Default in Core AAM Default Values Table only. |
| heading | aria-level | 2 | Required. Default in Core AAM Default Values Table only. |
| menuitemcheckbox | aria-checked | false | Required. Default in Core AAM Default Values Table only. |
| menuitemradio | aria-checked | false | Required. Default in Core AAM Default Values Table only. |
| option | aria-selected | false | Supported. No default. PR #799 |
| radio | aria-checked | false | Required. Default in Core AAM Default Values Table only. |
| scrollbar | aria-orientation | vertical | Supported. Default in ARIA and Core AAM Default Values Table. |
| scrollbar | aria-valuemin | 0 | Supported. Default in ARIA and Core AAM Default Values Table. |
| scrollbar | aria-valuemax | 100 | Supported. Default in ARIA and Core AAM Default Values Table. |
| scrollbar | aria-valuenow | halfway between valuemax and valuemin | Required. Default in Core AAM Default Values Table only. Consider changing default value to aria-valuemin. |
| separator (focusable) | aria-valuemin | 0 | Supported. Default in ARIA and needs to be added to Core AAM Default Values Table. |
| separator (focusable) | aria-valuemax | 100 | Supported. Default in ARIA and needs to be added to Core AAM Default Values Table. |
| separator (focusable) | aria-valuenow | 50 | Required. Default needs to be removed from ARIA and added to Core AAM Default Values Table as "(aria-valuemax - aria-valuemin) / 2". |
| slider | aria-valuemin | 0 | Supported. Default in ARIA and Core AAM Default Values Table. |
| slider | aria-valuemax | 100 | Supported. Default in ARIA and Core AAM Default Values Table. |
| slider | aria-valuenow | halfway between valuemax and valuemin | Required. Default in Core AAM Default Values Table only. |
| spinbutton | aria-valuemin | no minimum value | Supported. Default in ARIA and Core AAM Default Values Table. |
| spinbutton | aria-valuemax | no maximum value | Supported. Default in ARIA and Core AAM Default Values Table. |
| spinbutton | aria-valuenow | 0 | Required. Default in Core AAM Default Values Table only. |
| switch | aria-checked | false | Required. Default in Core AAM Default Values Table only. |
| treeitem | aria-selected | false | Supported. No default. PR #799 |