bug(matTooltip): Add option to set aria-labelledby rather than aria-describedby #23284
Labels
Accessibility
This issue is related to accessibility (a11y)
area: material/tooltip
feature
This issue represents a new feature or feature request rather than a bug or bug fix
P4
A relatively minor issue that is not relevant to core functions
Reproduction
matTooltip is only able to apply aria-describedby to its host element. This is not optimal for host elements that have no aria-label or text contents.
Expected Behavior
What behavior were you expecting to see?
For a button with no textual label, eg a MatIconButton, a tooltip typically provides a label rather than a description.
Having matTooltip apply aria-labeledby rather than would be better in these cases.
At the very least, it would be good to have an Input to configure matTooltip's labeledby vs describedby preference.
Extra credit: change the default for obvious cases like MatIconButton.
Actual Behavior
What behavior did you actually see?
matTooltip applies aria-describedby, with no option to change this behavior.
Environment
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