[web] API to customize semantics placeholder message#178309
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This pull request introduces a new API to customize the accessibility placeholder message on the web. The changes involve refactoring SemanticsHelper and its SemanticsEnabler implementations to support dynamic updates to the placeholder's label, replacing the previous hardcoded message. The new API is exposed via ui_web.accessibilityPlaceholderMessage. The changes are well-tested. I've found a missing method implementation in a test class that would cause a compile error, and some missing documentation. Overall, this is a good improvement.
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To customize the accessibility placeholder message:
```dart
import 'dart:ui_web' as ui_web;
void main() {
ui_web.accessibilityPlaceholderMessage = 'My Custom Accessibility Message!';
// ....
}
```
Fixes flutter#178172
mboetger
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To customize the accessibility placeholder message:
```dart
import 'dart:ui_web' as ui_web;
void main() {
ui_web.accessibilityPlaceholderMessage = 'My Custom Accessibility Message!';
// ....
}
```
Fixes flutter#178172
reidbaker
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Dec 10, 2025
To customize the accessibility placeholder message:
```dart
import 'dart:ui_web' as ui_web;
void main() {
ui_web.accessibilityPlaceholderMessage = 'My Custom Accessibility Message!';
// ....
}
```
Fixes flutter#178172
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To customize the accessibility placeholder message:
Fixes #178172