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feat: enable more granular a11y feature management (#48625)

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* feat: enable more granular a11y feature management

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

* Update docs/api/app.md

Co-authored-by: John Kleinschmidt <jkleinsc@electronjs.org>

Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>

---------

Co-authored-by: trop[bot] <37223003+trop[bot]@users.noreply.github.com>
Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>
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@ -1398,7 +1398,75 @@ details. Disabled by default.
This API must be called after the `ready` event is emitted.
> [!NOTE]
> Rendering accessibility tree can significantly affect the performance of your app. It should not be enabled by default.
> Rendering accessibility tree can significantly affect the performance of your app. It should not be enabled by default. Calling this method will enable the following accessibility support features: `nativeAPIs`, `webContents`, `inlineTextBoxes`, and `extendedProperties`.
### `app.getAccessibilitySupportFeatures()` _macOS_ _Windows_
Returns `string[]` - Array of strings naming currently enabled accessibility support components. Possible values:
* `nativeAPIs` - Native OS accessibility APIs integration enabled.
* `webContents` - Web contents accessibility tree exposure enabled.
* `inlineTextBoxes` - Inline text boxes (character bounding boxes) enabled.
* `extendedProperties` - Extended accessibility properties enabled.
* `screenReader` - Screen reader specific mode enabled.
* `html` - HTML accessibility tree construction enabled.
* `labelImages` - Accessibility support for automatic image annotations.
* `pdfPrinting` - Accessibility support for PDF printing enabled.
Notes:
* The array may be empty if no accessibility modes are active.
* Use `app.isAccessibilitySupportEnabled()` for the legacy boolean check;
prefer this method for granular diagnostics or telemetry.
Example:
```js
const { app } = require('electron')
app.whenReady().then(() => {
if (app.getAccessibilitySupportFeatures().includes('screenReader')) {
// Change some app UI to better work with Screen Readers.
}
})
```
### `app.setAccessibilitySupportFeatures(features)` _macOS_ _Windows_
* `features` string[] - An array of the accessibility features to enable.
Possible values are:
* `nativeAPIs` - Native OS accessibility APIs integration enabled.
* `webContents` - Web contents accessibility tree exposure enabled.
* `inlineTextBoxes` - Inline text boxes (character bounding boxes) enabled.
* `extendedProperties` - Extended accessibility properties enabled.
* `screenReader` - Screen reader specific mode enabled.
* `html` - HTML accessibility tree construction enabled.
* `labelImages` - Accessibility support for automatic image annotations.
* `pdfPrinting` - Accessibility support for PDF printing enabled.
To disable all supported features, pass an empty array `[]`.
Example:
```js
const { app } = require('electron')
app.whenReady().then(() => {
// Enable a subset of features:
app.setAccessibilitySupportFeatures([
'screenReader',
'pdfPrinting',
'webContents'
])
// Other logic
// Some time later, disable all features:
app.setAccessibilitySupportFeatures([])
})
```
### `app.showAboutPanel()`