When an element is invalid due to a validation error, the user needs to be informed. This method must highlight the given element in a way that makes the user notice that the element is invalid.
An element to highlight.
When an element is invalid due to a validation error, the user needs to be informed. This method must
remove the highlighting of the given element that was added by highlight.
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When an element is invalid due to a validation error, the user needs to be informed. A highlight handler is responsible for changing the visual state of an element so that the user notices the invalid element. A highlight handler is usually registered for a particular type of element or widget.