Hi Dimi, If I correctly understood your question, based on the demo/test page behavior, yes, the preview highlight should be applied to the field that triggers the autofill.
Bug 1822013 Comment 3 Edit History
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Hi Dimi, If I correctly understood your question, based on the demo/test page behavior (see the video attached to this comment), yes, the preview highlight should be applied to the field that triggers the autofill.